/*
 * jit-rules-arm.ins - Instruction selector for ARM.
 *
 * Copyright (C) 2004  Southern Storm Software, Pty Ltd.
 * Copyright (C) 2008  Michele Tartara  <mikyt@users.sourceforge.net>
 *
 * This file is part of the libjit library.
 *
 * The libjit library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * The libjit library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the libjit library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

%inst_type arm_inst_buf

/*
 * Register classes
 */
%regclass reg arm_reg
%regclass freg arm_freg
%regclass freg32 arm_freg32
%regclass freg64 arm_freg64
%lregclass lreg arm_lreg

/*
 * Conversion opcodes.
 */

JIT_OP_TRUNC_SBYTE: 
	[reg] -> {
		arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 24);
		arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 24);
	}

JIT_OP_TRUNC_UBYTE: 
	[reg] -> {
		arm_alu_reg_imm8(inst, ARM_AND, $1, $1, 0xFF);
	}

JIT_OP_TRUNC_SHORT: 
	[reg] -> {
		arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 16);
		arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 16);
	}

JIT_OP_TRUNC_USHORT: 
	[reg] -> {
		arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 16);
		arm_shift_reg_imm8(inst, ARM_SHR, $1, $1, 16);
	}

JIT_OP_INT_TO_NFLOAT:
	[=freg64, local, scratch freg32] -> {
		//Load int from a local variable stored in memory
		arm_load_membase_float(inst, $3, ARM_FP, $2, 0);
		arm_convert_float_signed_integer_double(inst, $1, $3);
	}
	[=freg64, reg, scratch freg32] -> {
		//The int value is in a register
		arm_mov_float_reg(inst, $3, $2);
		arm_convert_float_signed_integer_double(inst, $1, $3)
	}

JIT_OP_NFLOAT_TO_FLOAT32:
	[=freg32, freg64] -> {
		arm_convert_float_single_double(inst, $1, $2);
	}

JIT_OP_NFLOAT_TO_FLOAT64, JIT_OP_FLOAT64_TO_NFLOAT: copy
	[freg64] -> {
		/* Nothing to do: float64 and nfloat are the same thing on ARM linux. Just copy the value */
	}

JIT_OP_FLOAT32_TO_NFLOAT:
	[=freg64, freg32] -> {
		arm_convert_float_double_single(inst, $1, $2);
	}

/*
 * Arithmetic opcodes.
 */

JIT_OP_IADD: 
	[reg, immu8] -> {
		arm_alu_reg_imm8(inst, ARM_ADD, $1, $1, $2);
	}
	[reg, reg] -> {
		arm_alu_reg_reg(inst, ARM_ADD, $1, $1, $2);
	}

JIT_OP_ISUB: 
	[reg, immu8] -> {
		arm_alu_reg_imm8(inst, ARM_SUB, $1, $1, $2);
	}
	[reg, reg] -> {
		arm_alu_reg_reg(inst, ARM_SUB, $1, $1, $2);
	}

JIT_OP_IMUL: 
	[reg, immu8] -> {
		/* Handle special cases of immediate multiplies */
		switch($2)
		{
			case 0:
			{
				arm_mov_reg_imm8(inst, $1, 0);
			}
			break;

			case 1: break;

			case 2:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 1);
			}
			break;

			case 4:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 2);
			}
			break;

			case 8:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 3);
			}
			break;

			case 16:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 4);
			}
			break;

			case 32:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 5);
			}
			break;

			case 64:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 6);
			}
			break;

			case 128:
			{
				arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, 7);
			}
			break;

			default:
			{
				arm_mov_reg_imm8(inst, ARM_WORK, $2);
				arm_mul_reg_reg(inst, $1, $1, ARM_WORK);
			}
			break;
		}
	}
	[reg, reg] -> {
		if($1 != $2)
		{
			arm_mul_reg_reg(inst, $1, $1, $2);
		}
		else
		{
			/* Cannot use the same register for both arguments */
			arm_mov_reg_reg(inst, ARM_WORK, $2);
			arm_mul_reg_reg(inst, $1, $1, ARM_WORK);
		}
	}

JIT_OP_IDIV:
	[any, immzero] -> {
		throw_builtin(&inst, func, ARM_CC_AL, JIT_RESULT_DIVISION_BY_ZERO);
	}
	[reg, immu8, if("$2 == 1")] -> {
		/* Division by 1. Return the value itself */
	}
	[reg, immu8, if("($2 > 0) && (((jit_nuint)$2) & (((jit_nuint)$2) - 1)) == 0")] -> {
		/* Handle special cases of small immediate divides: divisions by positive powers of two */
		/* NB: (n & (n-1)) == 0 if and only if n is a power of 2 */
		
		/* Move the dividend in the work register, setting the codes (in order to know if it's positive or negative) */
		arm_alu_cc_reg(inst, ARM_MOV, ARM_WORK, $1);

		/* If the dividend is negative, make it positive (0-x = -x)*/
		arm_alu_reg_imm8_cond(inst, ARM_RSB, $1, ARM_WORK, 0, ARM_CC_MI);

		switch($2)
		{
			//Integer divide by shifting
			case 2:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 1);
			}
			break;

			case 4:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 2);
			}
			break;

			case 8:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 3);
			}
			break;

			case 16:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 4);
			}
			break;

			case 32:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 5);
			}
			break;

			case 64:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 6);
			}
			break;

			case 128:
			{
				arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, 7);
			}
			break;
		}
		
		/* If the dividend was negative, make it negative again (0-x = -x)*/
		arm_alu_reg_imm8_cond(inst, ARM_RSB, $1, $1, 0, ARM_CC_MI);
		
	}
	[reg, imm, if("$2 == -1")] -> {
		/* Dividing by -1 simply negates */
		/*TODO: if the value to be divided by -1 is jit_min_int, 
		  an exception (JIT_RESULT_ARITHMETIC) should probably be thrown */
		arm_alu_reg(inst, ARM_MVN, $1, $1);
	}
	[reg, imm, clobber("r0", "r1")] -> {
		/* Every other immediate division:
		   ARM does not have an integer division operation. It's emulated via software. */
		
		//Put the dividend in the right position
		if ($1 != ARM_R0)
			arm_mov_reg_reg(inst, ARM_R0, $1);
		
		//Put the divisor in the right position
		mov_reg_imm(gen, &inst, ARM_R1, $2);
		
		//Perform the division by calling a function from the runtime ABI
		extern int __aeabi_idiv(int numerator, int denominator);
		arm_call(inst, __aeabi_idiv);
		
		if($1 != ARM_R0)
		{
			//Move the result back where it is expected to be
			arm_mov_reg_reg(inst, $1, ARM_R0);
		}
		
	}
	[reg, reg, scratch reg, clobber("r0", "r1")] -> {
		/* Every division taking data from two registers:
		   ARM does not have an integer division operation. It's emulated via software. */
		
		int dividend = $1;
		int divisor = $2;
		int scratch = $3;
		
		//Put the dividend in the right position
		if (dividend != ARM_R0)
		{
			if (divisor==ARM_R0)
			{
				//Prevent the divisor from being overwritten
				if(dividend != ARM_R1)
				{
					//The place where the divisor should be is free. Move it there
					arm_mov_reg_reg(inst, ARM_R1, divisor);
					divisor=1;
				}
				else
				{
					/* The dividend is where the divisor should be.
					   We must use a scratch register to swap them */
					arm_mov_reg_reg(inst, scratch, divisor);
					divisor=scratch;
				}
				
			}
			
			arm_mov_reg_reg(inst, ARM_R0, dividend);
		}
		
		if (divisor != ARM_R1)
		{
			//Put the divisor in the right position
			arm_mov_reg_reg(inst, ARM_R1, divisor);
		}
		
		//Perform the division by calling a function from the runtime ABI
		extern int __aeabi_idiv(int numerator, int denominator);
		arm_call(inst, __aeabi_idiv);
		
		//Move the result back where it is expected to be
		if($1 != ARM_R0)
		{
			arm_mov_reg_reg(inst, $1, ARM_R0);
		}
	}

JIT_OP_INEG: 
	[reg] -> {
		/* -x is the same as (0 - x) */
		arm_alu_reg_imm8(inst, ARM_RSB, $1, $1, 0);
	}

JIT_OP_LADD: 
	[lreg, lreg] -> {
		arm_alu_cc_reg_reg(inst, ARM_ADD, $1, $1, $2);
		arm_alu_reg_reg(inst, ARM_ADC, %1, %1, %2);
	}

JIT_OP_LSUB: 
	[lreg, lreg] -> {
		arm_alu_cc_reg_reg(inst, ARM_SUB, $1, $1, $2);
		arm_alu_reg_reg(inst, ARM_SBC, %1, %1, %2);
	}

JIT_OP_LNEG: 
	[lreg] -> {
		arm_alu_reg(inst, ARM_MVN, $1, $1);
		arm_alu_reg(inst, ARM_MVN, %1, %1);
		arm_alu_cc_reg_imm8(inst, ARM_ADD, $1, $1, 1);
		arm_alu_reg_imm8(inst, ARM_ADC, %1, %1, 0);
	}

JIT_OP_FADD (JIT_ARM_HAS_VFP): 
	[freg32, freg32] -> {
		arm_alu_freg_freg_32(inst, ARM_FADD, $1, $1, $2);
	}
	
JIT_OP_FADD (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg_32(inst, ARM_ADF, $1, $1, $2);
	}

JIT_OP_FSUB (JIT_ARM_HAS_VFP): 
	[freg32, freg32] -> {
		arm_alu_freg_freg_32(inst, ARM_FSUB, $1, $1, $2);
	}

JIT_OP_FSUB (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg_32(inst, ARM_SUF, $1, $1, $2);
	}

JIT_OP_FMUL (JIT_ARM_HAS_VFP): 
	[freg32, freg32] -> {
		arm_alu_freg_freg_32(inst, ARM_FMUL, $1, $1, $2);
	}

JIT_OP_FMUL (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg_32(inst, ARM_MUF, $1, $1, $2);
	}

JIT_OP_FDIV (JIT_ARM_HAS_VFP): 
	[freg32, freg32] -> {
		arm_alu_freg_freg_32(inst, ARM_FDIV, $1, $1, $2);
	}

JIT_OP_FDIV (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg_32(inst, ARM_DVF, $1, $1, $2);
	}

JIT_OP_FNEG (JIT_ARM_HAS_VFP): 
	[freg32] -> {
		arm_alu_freg_32(inst, ARM_MNF, $1, $1);
	}

JIT_OP_FNEG (JIT_ARM_HAS_FPA): /*unary*/
	[freg] -> {
		arm_alu_freg_32(inst, ARM_MNF, $1, $1);
	}

JIT_OP_DADD, JIT_OP_NFADD (JIT_ARM_HAS_VFP): 
	[freg64, freg64] -> {
		arm_alu_freg_freg(inst, ARM_FADD, $1, $1, $2);
	}

JIT_OP_DADD, JIT_OP_NFADD (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg(inst, ARM_ADF, $1, $1, $2);
	}

JIT_OP_DSUB, JIT_OP_NFSUB (JIT_ARM_HAS_VFP): 
	[freg64, freg64] -> {
		arm_alu_freg_freg(inst, ARM_FSUB, $1, $1, $2);
	}

JIT_OP_DSUB, JIT_OP_NFSUB (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg(inst, ARM_SUF, $1, $1, $2);
	}

JIT_OP_DMUL, JIT_OP_NFMUL (JIT_ARM_HAS_VFP): 
	[freg64, freg64] -> {
		arm_alu_freg_freg(inst, ARM_FMUL, $1, $1, $2);
	}
	
JIT_OP_DMUL, JIT_OP_NFMUL (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg(inst, ARM_MUF, $1, $1, $2);
	}

JIT_OP_DDIV, JIT_OP_NFDIV (JIT_ARM_HAS_VFP): 
	[freg64, freg64] -> {
		arm_alu_freg_freg(inst, ARM_FDIV, $1, $1, $2);
	}

JIT_OP_DDIV, JIT_OP_NFDIV (JIT_ARM_HAS_FPA): /*binary*/
	[freg, freg] -> {
		arm_alu_freg_freg(inst, ARM_DVF, $1, $1, $2);
	}

JIT_OP_DNEG, JIT_OP_NFNEG (JIT_ARM_HAS_VFP): 
	[freg64] -> {
		arm_alu_freg(inst, ARM_MNF, $1, $1);
	}

JIT_OP_DNEG, JIT_OP_NFNEG (JIT_ARM_HAS_FPA): /*unary*/
	[freg] -> {
		arm_alu_freg(inst, ARM_MNF, $1, $1);
	}

/*
 * Bitwise opcodes.
 */

JIT_OP_IAND: 
	[reg, immu8] -> {
		arm_alu_reg_imm8(inst, ARM_AND, $1, $1, $2);
	}
	[reg, reg] -> {
		arm_alu_reg_reg(inst, ARM_AND, $1, $1, $2);
	}

JIT_OP_IOR: 
	[reg, immu8] -> {
		arm_alu_reg_imm8(inst, ARM_ORR, $1, $1, $2);
	}
	[reg, reg] -> {
		arm_alu_reg_reg(inst, ARM_ORR, $1, $1, $2);
	}

JIT_OP_IXOR: 
	[reg, immu8] -> {
		arm_alu_reg_imm8(inst, ARM_EOR, $1, $1, $2);
	}
	[reg, reg] -> {
		arm_alu_reg_reg(inst, ARM_EOR, $1, $1, $2);
	}

JIT_OP_INOT: 
	[reg] -> {
		/* MVN == "move not" */
		arm_alu_reg(inst, ARM_MVN, $1, $1);
	}

JIT_OP_ISHL: 
	[reg, imm] -> {
		arm_shift_reg_imm8(inst, ARM_SHL, $1, $1, ($2 & 0x1F));
	}
	[reg, reg] -> {
		arm_alu_reg_imm8(inst, ARM_AND, ARM_WORK, $2, 0x1F);
		arm_shift_reg_reg(inst, ARM_SHL, $1, $1, ARM_WORK);
	}

JIT_OP_ISHR: 
	[reg, imm] -> {
		arm_shift_reg_imm8(inst, ARM_SAR, $1, $1, ($2 & 0x1F));
	}
	[reg, reg] -> {
		arm_alu_reg_imm8(inst, ARM_AND, ARM_WORK, $2, 0x1F);
		arm_shift_reg_reg(inst, ARM_SAR, $1, $1, ARM_WORK);
	}

JIT_OP_ISHR_UN: 
	[reg, imm] -> {
		arm_shift_reg_imm8(inst, ARM_SHR, $1, $1, ($2 & 0x1F));
	}
	[reg, reg] -> {
		arm_alu_reg_imm8(inst, ARM_AND, ARM_WORK, $2, 0x1F);
		arm_shift_reg_reg(inst, ARM_SHR, $1, $1, ARM_WORK);
	}

JIT_OP_LAND: 
	[lreg, lreg] -> {
		arm_alu_reg_reg(inst, ARM_AND, $1, $1, $2);
		arm_alu_reg_reg(inst, ARM_AND, %1, %1, %2);
	}

JIT_OP_LOR: 
	[lreg, lreg] -> {
		arm_alu_reg_reg(inst, ARM_ORR, $1, $1, $2);
		arm_alu_reg_reg(inst, ARM_ORR, %1, %1, %2);
	}

JIT_OP_LXOR: 
	[lreg, lreg] -> {
		arm_alu_reg_reg(inst, ARM_EOR, $1, $1, $2);
		arm_alu_reg_reg(inst, ARM_EOR, %1, %1, %2);
	}

JIT_OP_LNOT: 
	[lreg] -> {
		arm_alu_reg(inst, ARM_MVN, $1, $1);
		arm_alu_reg(inst, ARM_MVN, %1, %1);
	}

/*
 * Branch opcodes.
 */

JIT_OP_BR: branch /*spill_before*/
	[] -> {
		/* ARM_CC_AL == "always branch" */
		output_branch(func, &inst, ARM_CC_AL, insn);

		/* Flush the constant pool now, to minimize the probability that
		   it is accidentally flushed in the middle of a loop body */
		jit_gen_save_inst_ptr(gen, inst);
		flush_constants(gen, 1);
		jit_gen_load_inst_ptr(gen, inst);
	}

JIT_OP_BR_IFALSE: branch 
	[reg] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, 0);
		output_branch(func, &inst, ARM_CC_EQ, insn);
	}

JIT_OP_BR_ITRUE: branch 
	[reg] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, 0);
		output_branch(func, &inst, ARM_CC_NE, insn);
	}

JIT_OP_BR_IEQ: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_EQ, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_EQ, insn);
	}

JIT_OP_BR_INE: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_NE, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_NE, insn);
	}

JIT_OP_BR_ILT: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LT, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LT, insn);
	}

JIT_OP_BR_ILT_UN: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LT_UN, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LT_UN, insn);
	}

JIT_OP_BR_ILE: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LE, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LE, insn);
	}

JIT_OP_BR_ILE_UN: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LE_UN, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_LE_UN, insn);
	}

JIT_OP_BR_IGT: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GT, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GT, insn);
	}

JIT_OP_BR_IGT_UN: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GT_UN, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GT_UN, insn);
	}

JIT_OP_BR_IGE: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GE, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GE, insn);
	}

JIT_OP_BR_IGE_UN: branch 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GE_UN, insn);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		output_branch(func, &inst, ARM_CC_GE_UN, insn);
	}

/*
 * Comparison opcodes.
 */

JIT_OP_ICMP: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE);
		arm_alu_reg_cond(inst, ARM_MVN, $1, $1, ARM_CC_LT);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE);
		arm_alu_reg_cond(inst, ARM_MVN, $1, $1, ARM_CC_LT);
	}

JIT_OP_ICMP_UN: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE_UN);
		arm_alu_reg_cond(inst, ARM_MVN, $1, $1, ARM_CC_LT_UN);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE_UN);
		arm_alu_reg_cond(inst, ARM_MVN, $1, $1, ARM_CC_LT_UN);
	}

JIT_OP_IEQ: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_EQ);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_NE);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_EQ);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_NE);
	}

JIT_OP_INE: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_NE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_EQ);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_NE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_EQ);
	}

JIT_OP_ILT: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GE);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GE);
	}

JIT_OP_ILT_UN: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GE_UN);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GE_UN);
	}

JIT_OP_ILE: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GT);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GT);
	}

JIT_OP_ILE_UN: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LE_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GT_UN);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_LE_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_GT_UN);
	}

JIT_OP_IGT: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE);
	}

JIT_OP_IGT_UN: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE_UN);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GT_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LE_UN);
	}

JIT_OP_IGE: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LT);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GE);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LT);
	}

JIT_OP_IGE_UN: 
	[reg, immu8] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GE_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LT_UN);
	}
	[reg, reg] -> {
		arm_test_reg_reg(inst, ARM_CMP, $1, $2);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 1, ARM_CC_GE_UN);
		arm_alu_reg_imm8_cond(inst, ARM_MOV, $1, 0, 0, ARM_CC_LT_UN);
	}

/*
 * Pointer check opcodes.
 */

JIT_OP_CHECK_NULL: note
	[reg] -> {
		arm_test_reg_imm8(inst, ARM_CMP, $1, 0);
		throw_builtin(&inst, func, ARM_CC_EQ, JIT_RESULT_NULL_REFERENCE);
	}

/*
 * Function calls.
 */

JIT_OP_CALL:
	[] -> {
		jit_function_t func = (jit_function_t)(insn->dest);
		arm_call(inst, jit_function_to_closure(func));
	}

JIT_OP_CALL_TAIL:
	[] -> {
		jit_function_t func = (jit_function_t)(insn->dest);
		arm_pop_frame_tail(inst, 0);
		arm_jump(inst, jit_function_to_closure(func));
	}

JIT_OP_CALL_INDIRECT:
	[] -> {
		arm_mov_reg_reg((inst), ARM_LINK, ARM_PC);
		arm_mov_reg_reg((inst), ARM_PC, ARM_WORK);
	}

JIT_OP_CALL_VTABLE_PTR:
	[] -> {
		arm_mov_reg_reg((inst), ARM_LINK, ARM_PC);
		arm_mov_reg_reg((inst), ARM_PC, ARM_WORK);
	}

JIT_OP_CALL_EXTERNAL:
	[] -> {
		arm_call(inst, (void *)(insn->dest));
	}

JIT_OP_RETURN:
	[] -> {
		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_RETURN_INT: /*unary_branch*/
	[reg] -> {
		int cpu_reg = $1;
		if(cpu_reg != ARM_R0)
		{
			arm_mov_reg_reg(inst, ARM_R0, cpu_reg);
		}
		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_RETURN_LONG: /*unary_branch*/
	[imm] -> {
		mov_reg_imm(gen, &inst, ARM_R0, ((jit_int *)($1))[0]);
		mov_reg_imm(gen, &inst, ARM_R1, ((jit_int *)($1))[1]);
		jump_to_epilog(gen, &inst, block);
	}
	[local] -> {
		arm_load_membase(inst, ARM_R0, ARM_FP, $1);
		arm_load_membase(inst, ARM_R1, ARM_FP, $1 + 4);
		jump_to_epilog(gen, &inst, block);
	}
	[lreg] -> {
		if($1 != 0)
		{
			arm_mov_reg_reg(inst, ARM_R0, $1);
			arm_mov_reg_reg(inst, ARM_R1, %1);
		}
		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_RETURN_FLOAT32 (JIT_ARM_HAS_VFP): branch 
	[freg32, clobber("r0")] -> {
		arm_mov_reg_float(inst, ARM_R0, $1);
		jump_to_epilog(gen, &inst, block);
	}
	
JIT_OP_RETURN_FLOAT32 (JIT_ARM_HAS_FPA): branch
	[freg] -> {
		if($1 != 0)
		{
			arm_alu_freg_32(inst, ARM_MVF, ARM_F0, $1);
		}
		jump_to_epilog(gen, &inst, block);
	}


JIT_OP_RETURN_FLOAT32 (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_spill_all(gen);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_R0, ((int *)(insn->value1->address))[0]);
		}
		else
		{
			arm_load_membase(inst, ARM_R0, ARM_FP, insn->value1->frame_offset);
		}
		jump_to_epilog(gen, &inst, block);
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_RETURN_FLOAT64, JIT_OP_RETURN_NFLOAT
		(JIT_ARM_HAS_VFP): branch 
	[freg64, clobber("r0", "r1")] -> {
		arm_mov_reg_reg_double(inst,ARM_R0,ARM_R1, $1);
		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_RETURN_FLOAT64, JIT_OP_RETURN_NFLOAT (JIT_ARM_HAS_FPA): branch
	[freg] -> {
		if($1 != 0)
		{
			arm_alu_freg(inst, ARM_MVF, ARM_F0, $1);
		}
		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_RETURN_FLOAT64, JIT_OP_RETURN_NFLOAT (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_spill_all(gen);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_R0, ((int *)(insn->value1->address))[0]);
			mov_reg_imm
				(gen, &inst, ARM_R1, ((int *)(insn->value1->address))[1]);
		}
		else
		{
			arm_load_membase(inst, ARM_R0, ARM_FP, insn->value1->frame_offset);
			arm_load_membase(inst, ARM_R1, ARM_FP,
							 insn->value1->frame_offset + 4);
		}
		jump_to_epilog(gen, &inst, block);
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_RETURN_SMALL_STRUCT: note
	[reg, imm, clobber("r0", "r1")] -> {
		//$1: address of the struct to be returned
		//$2: size of the struct to be returned
		
		//Prevent the accidental overwriting of the address
		int temp_reg = $1;
		if(temp_reg < 3)
		{
			arm_mov_reg_reg(inst, ARM_WORK, temp_reg);
			temp_reg = ARM_WORK;
		}
		
		//Copy the struct to the return register in a way that's appropriate to its size
		switch($2)
		{
		case 1:
			arm_load_membase_byte(inst, ARM_R0, temp_reg, 0);
			break;

		case 2:
			arm_load_membase_ushort(inst, ARM_R0, temp_reg, 0);
			break;

		case 3:
			arm_load_membase_ushort(inst, ARM_R0, temp_reg, 0);
			arm_load_membase_byte(inst, ARM_R1, temp_reg, 2);
			arm_shift_reg_imm8(inst, ARM_SHL, ARM_R1, ARM_R1, 16);
			arm_alu_reg_reg(inst, ARM_ORR, ARM_R0, ARM_R0, ARM_R1);
			break;

		case 4:
			arm_load_membase(inst, ARM_R0, temp_reg, 0);
			break;

		/*TODO: is this the right way to return a struct > 4 bytes?
		* Or should it be returned by address? Look at the Procedure Call Standard!
		*/
		
		case 5:
			arm_load_membase(inst, ARM_R0, temp_reg, 0);
			arm_load_membase_byte(inst, ARM_R1, temp_reg, 4);
			break;

		case 6:
			arm_load_membase(inst, ARM_R0, temp_reg, 0);
			arm_load_membase_ushort(inst, ARM_R1, temp_reg, 4);
			break;

		case 7:
			arm_load_membase(inst, ARM_R0, temp_reg, 0);
			arm_load_membase_ushort(inst, ARM_R1, temp_reg, 4);
			arm_load_membase_byte(inst, ARM_R2, temp_reg, 6);
			arm_shift_reg_imm8(inst, ARM_SHL, ARM_R2, ARM_R2, 16);
			arm_alu_reg_reg(inst, ARM_ORR, ARM_R1, ARM_R1, ARM_R2);
			break;

		case 8:
			arm_load_membase(inst, ARM_R0, temp_reg, 0);
			arm_load_membase(inst, ARM_R1, temp_reg, 4);
			break;
		}

		jump_to_epilog(gen, &inst, block);
	}

JIT_OP_SETUP_FOR_NESTED: /*spill_before*/
	[] -> {
		jit_nint nest_reg = jit_value_get_nint_constant(insn->value1);
		if(nest_reg == -1)
		{
			arm_push_reg(inst, ARM_FP);
		}
		else
		{
			arm_mov_reg_reg(inst, _jit_reg_info[nest_reg].cpu_reg, ARM_FP);
		}
	}

JIT_OP_SETUP_FOR_SIBLING: /*spill_before*/
	[] -> {
		jit_nint level = jit_value_get_nint_constant(insn->value1);
		jit_nint nest_reg = jit_value_get_nint_constant(insn->value2);
		int cpu_reg;
		if(nest_reg == -1)
		{
			cpu_reg = ARM_R0;
		}
		else
		{
			cpu_reg = _jit_reg_info[nest_reg].cpu_reg;
		}
		arm_load_membase(inst, cpu_reg, ARM_FP, JIT_APPLY_PARENT_FRAME_OFFSET);
		while(level > 0)
		{
			arm_load_membase(inst, cpu_reg, cpu_reg,
							 JIT_APPLY_PARENT_FRAME_OFFSET);
			--level;
		}
		if(nest_reg == -1)
		{
			arm_push_reg(inst, cpu_reg);
		}
	}

JIT_OP_IMPORT:
	[] -> {
		/* TODO */
		TODO();
	}

/*
 * Exception handling
 */
JIT_OP_THROW: branch
	[reg] -> {

		arm_push_reg(inst, $1);
		if(func->builder->setjmp_value != 0)
		{
			/* We have a "setjmp" block in the current function,
			   so we must record the location of the throw first */
			jit_nint pc_offset;
		
			_jit_gen_fix_value(func->builder->setjmp_value);
			
			pc_offset = func->builder->setjmp_value->frame_offset +
							jit_jmp_catch_pc_offset;
							
			if(func->builder->position_independent)
			{
				arm_call_imm(inst, 0);
				arm_pop_membase(inst, ARM_FP, pc_offset);
			}
			else
			{
				int pc = (int) (unsigned char *) arm_inst_get_posn(inst);
				arm_mov_membase_imm(inst, ARM_FP, pc_offset, pc, 4, ARM_WORK);
			}
		}
		arm_call(inst, (void *)jit_exception_throw);
	}

JIT_OP_LOAD_PC:
[=reg] -> {
	if(func->builder->position_independent)
	{
		arm_call_imm(inst, 0);
		arm_pop_reg(inst, $1);
	}
	else
	{
		int pc = inst.current;
		mov_reg_imm(gen, &inst, $1, pc);
	}
}

JIT_OP_ENTER_FINALLY:
[] -> { /* 
	 * The return address is in the link register
	 * We must save it on the stack in case it will be overwritten by the content
	 * of the "finally" block.
	 * In order to respect the ABI of the ARM architecture, that prescribes an 8-byte
	 * alignment for the stack at a public interface, we save the value twice, 
	 * in order to move the current SP by 8 bytes 
	 * (we could have just saved the value once and then moved the SP by 4 bytes)
	 */
	arm_push_reg(inst, ARM_LINK);
	arm_push_reg(inst, ARM_LINK);
}

JIT_OP_LEAVE_FINALLY: branch
[] -> {
	/* The "finally" return address is on the stack (twice, just for padding)*/
		arm_pop_reg(inst, ARM_LINK);
		arm_pop_reg(inst, ARM_LINK);
		arm_return(inst);
}

JIT_OP_CALL_FINALLY: branch
[] -> {
	jit_block_t block;
	int offset;
	block = jit_block_from_label(func, (jit_label_t)(insn->dest));
	if(!block)
	{
		return;
	}
	if(arm_inst_get_posn(inst) >= arm_inst_get_limit(inst))
	{
		/* The buffer has overflowed, so don't worry about fixups */
		return;
	}
	if(block->address)
	{
		/* We already know the address of the block */
		arm_call(inst, block->address);
	}
	else
	{
		/* Output a placeholder and record on the block's fixup list */
		if(block->fixup_list)
		{
			offset = (int)(((unsigned char *)arm_inst_get_posn(inst)) -
			((unsigned char *)(block->fixup_list)));
		}
		else
		{
			offset = 0;
		}
		arm_call_imm(inst, offset);
		block->fixup_list = (void *)(arm_inst_get_posn(inst) - 1);
	}
}

JIT_OP_ADDRESS_OF_LABEL:
[=reg] -> {
	block = jit_block_from_label(func, (jit_label_t)(insn->value1));
	if(func->builder->position_independent)
	{
		/* TODO */
			TODO();
	}
	else
	{
		if(block->address)
		{
			mov_reg_imm(gen, &inst, $1, block->address);
		}
		else
		{
			/* Output a placeholder and record on the block's fixup list */
				mov_reg_imm(gen, &inst, $1, (int)(block->fixup_absolute_list));
				block->fixup_absolute_list = (void *)(inst.current - 1);
		}
	}
}

/*
 * Data manipulation.
 */

JIT_OP_COPY_LOAD_SBYTE: 
	[reg] -> {}

JIT_OP_COPY_LOAD_UBYTE: 
	[reg] -> {}

JIT_OP_COPY_LOAD_SHORT: 
	[reg] -> {}

JIT_OP_COPY_LOAD_USHORT: 
	[reg] -> {}

JIT_OP_COPY_INT: copy 
	[=local, imm, scratch reg] -> {
		arm_mov_membase_imm(inst, ARM_FP, $1, $2, 4, $3);
	}
	[reg] -> {}
	

JIT_OP_COPY_LONG: copy 
	[lreg] -> {}

JIT_OP_COPY_FLOAT32 (JIT_ARM_HAS_FLOAT_REGS): copy
	[freg32] -> {}

JIT_OP_COPY_FLOAT32 (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_regs_force_out(gen, insn->dest, 1);
		_jit_gen_fix_value(insn->value1);
		_jit_gen_fix_value(insn->dest);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
		}
		arm_store_membase(inst, ARM_WORK, ARM_FP, insn->dest->frame_offset);
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_COPY_FLOAT64, JIT_OP_COPY_NFLOAT (JIT_ARM_HAS_FLOAT_REGS): copy
	[freg64] -> {}

JIT_OP_COPY_FLOAT64, JIT_OP_COPY_NFLOAT (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_regs_force_out(gen, insn->dest, 1);
		_jit_gen_fix_value(insn->value1);
		_jit_gen_fix_value(insn->dest);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
			arm_store_membase(inst, ARM_WORK, ARM_FP,
							  insn->dest->frame_offset);
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[1]);
			arm_store_membase(inst, ARM_WORK, ARM_FP,
							  insn->dest->frame_offset + 4);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
			arm_store_membase(inst, ARM_WORK, ARM_FP,
							  insn->dest->frame_offset);
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset + 4);
			arm_store_membase(inst, ARM_WORK, ARM_FP,
							  insn->dest->frame_offset + 4);
		}
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_COPY_STRUCT:
	[=frame, frame, scratch reg] -> {
		inst = memory_copy(gen, inst, ARM_FP, $1, ARM_FP, $2,
				jit_type_get_size(jit_value_get_type(insn->dest)), $3);
	}

JIT_OP_COPY_STORE_BYTE: manual
	[] -> {
		arm_inst_buf inst;
		int reg;
		_jit_regs_force_out(gen, insn->dest, 1);
		_jit_gen_fix_value(insn->dest);
		reg = _jit_regs_load_value
			(gen, insn->value1, 0,
			 (insn->flags & (JIT_INSN_VALUE1_NEXT_USE |
			 				 JIT_INSN_VALUE1_LIVE)));
		jit_gen_load_inst_ptr(gen, inst);
		arm_store_membase_byte(inst, _jit_reg_info[reg].cpu_reg,
							   ARM_FP, insn->dest->frame_offset);
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_COPY_STORE_SHORT: manual
	[] -> {
		arm_inst_buf inst;
		int reg;
		_jit_regs_force_out(gen, insn->dest, 1);
		_jit_gen_fix_value(insn->dest);
		reg = _jit_regs_load_value
			(gen, insn->value1, 1,
			 (insn->flags & (JIT_INSN_VALUE1_NEXT_USE |
			 				 JIT_INSN_VALUE1_LIVE)));
		jit_gen_load_inst_ptr(gen, inst);
		arm_store_membase_short(inst, _jit_reg_info[reg].cpu_reg,
							    ARM_FP, insn->dest->frame_offset);
		jit_gen_save_inst_ptr(gen, inst);
		//_jit_regs_free_reg(gen, reg, 1); //TODO: check if it's needed
	}

JIT_OP_ADDRESS_OF:
	[=reg, frame] -> {
		if($2 > 0)
		{
			arm_alu_reg_imm(inst, ARM_ADD, $1, ARM_FP, $2);
		}
		else if($2 < 0)
		{
			arm_alu_reg_imm(inst, ARM_SUB, $1, ARM_FP, -$2);
		}
		else
		{
			arm_mov_reg_reg(inst, $1, ARM_FP);
		}

	}

/*
 * Stack pushes and pops.
 */

JIT_OP_INCOMING_REG, JIT_OP_RETURN_REG: note
        [reg] -> {
		/*
		 * This rule does nothing itself. Also at this point
		 * the value is supposed to be already in the register
		 * so the "reg" pattern does not load it either. But
		 * it allows the allocator to check the liveness flags
		 * and free the register if the value is dead.
		 */
	}
	
JIT_OP_PUSH_INT: note
	[reg] -> {
		arm_push_reg(inst, $1);
	}

JIT_OP_PUSH_LONG: note
	[lreg] -> {
		arm_push_reg(inst, %1);
		arm_push_reg(inst, $1);
		gen->stack_changed=1;
	}

JIT_OP_PUSH_FLOAT32 (JIT_ARM_HAS_FLOAT_REGS): note
	[freg32] -> {
		arm_push_reg_float32(inst, $1);
	}

JIT_OP_PUSH_FLOAT32 (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
		}
		arm_push_reg(inst, ARM_WORK);
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_PUSH_FLOAT64, JIT_OP_PUSH_NFLOAT (JIT_ARM_HAS_FLOAT_REGS): note
	[freg64] -> {
		arm_push_reg_float64(inst, $1);
	}

JIT_OP_PUSH_FLOAT64, JIT_OP_PUSH_NFLOAT (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[1]);
			arm_push_reg(inst, ARM_WORK);
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
			arm_push_reg(inst, ARM_WORK);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset + 4);
			arm_push_reg(inst, ARM_WORK);
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
			arm_push_reg(inst, ARM_WORK);
		}
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_PUSH_STRUCT: /*unary_note*/
	[reg] -> {
		/* TODO */
		TODO();
	}

JIT_OP_POP_STACK:
	[] -> {
		arm_alu_reg_imm(inst, ARM_ADD, ARM_SP, ARM_SP, insn->value1->address);
	}

JIT_OP_FLUSH_SMALL_STRUCT:
	[] -> {
		jit_nuint size;
		jit_nint offset;
		_jit_gen_fix_value(insn->value1);
		size = jit_type_get_size(jit_value_get_type(insn->value1));
		offset = insn->value1->frame_offset;
		switch(size)
		{
			case 1:
			{
				arm_store_membase_byte(inst, ARM_R0, ARM_FP, offset);
			}
			break;

			case 2:
			{
				arm_store_membase_short(inst, ARM_R0, ARM_FP, offset);
			}
			break;

			case 3:
			{
				arm_mov_reg_reg(inst, ARM_R1, ARM_R0);
				arm_store_membase_short(inst, ARM_R0, ARM_FP, offset);
				arm_shift_reg_imm8(inst, ARM_SHR, ARM_R0, ARM_R1, 16);
				arm_store_membase_byte(inst, ARM_R0, ARM_FP, offset + 2);
			}
			break;

			case 4:
			{
				arm_store_membase(inst, ARM_R0, ARM_FP, offset);
			}
			break;

			case 5:
			{
				arm_store_membase(inst, ARM_R0, ARM_FP, offset);
				arm_store_membase_byte(inst, ARM_R1, ARM_FP, offset + 4);
			}
			break;

			case 6:
			{
				arm_store_membase(inst, ARM_R0, ARM_FP, offset);
				arm_store_membase_short(inst, ARM_R1, ARM_FP, offset + 4);
			}
			break;

			case 7:
			{
				arm_store_membase(inst, ARM_R0, ARM_FP, offset);
				arm_mov_reg_reg(inst, ARM_R2, ARM_R1);
				arm_store_membase_short(inst, ARM_R1, ARM_FP, offset + 4);
				arm_shift_reg_imm8(inst, ARM_SHR, ARM_R1, ARM_R2, 16);
				arm_store_membase_byte(inst, ARM_R1, ARM_FP, offset + 6);
			}
			break;

			case 8:
			{
				arm_store_membase(inst, ARM_R0, ARM_FP, offset);
				arm_store_membase(inst, ARM_R1, ARM_FP, offset + 4);
			}
			break;
		}
	}

JIT_OP_SET_PARAM_INT: note
	[imm, imm] -> {
		arm_mov_membase_imm(inst, ARM_SP, $2, $1, 4, ARM_WORK);
	}
	[reg, imm] -> {
		arm_mov_membase_reg(inst, ARM_SP, $2, $1, 4);
	}

JIT_OP_SET_PARAM_LONG: /*unary_note*/
	[lreg] -> {
		arm_store_membase(inst, $1, ARM_SP, insn->value2->address);
		arm_store_membase(inst, %1, ARM_SP, insn->value2->address + 4);
	}

JIT_OP_SET_PARAM_FLOAT32 (JIT_ARM_HAS_FLOAT_REGS): /*unary_note*/
	[freg32] -> {
		arm_store_membase_float32(inst, $1, ARM_SP, insn->value2->address);
	}

JIT_OP_SET_PARAM_FLOAT32 (!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address);
		}
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_SET_PARAM_FLOAT64, JIT_OP_SET_PARAM_NFLOAT
		(JIT_ARM_HAS_FLOAT_REGS): /*unary_note*/
	[freg64] -> {
		arm_store_membase_float64(inst, $1, ARM_SP, insn->value2->address);
	}

JIT_OP_SET_PARAM_FLOAT64, JIT_OP_SET_PARAM_NFLOAT
		(!JIT_ARM_HAS_FLOAT_REGS): manual
	[] -> {
		arm_inst_buf inst;
		_jit_regs_force_out(gen, insn->value1, 0);
		_jit_gen_fix_value(insn->value1);
		jit_gen_load_inst_ptr(gen, inst);
		if(insn->value1->is_constant)
		{
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[0]);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address);
			mov_reg_imm
				(gen, &inst, ARM_WORK, ((int *)(insn->value1->address))[1]);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address + 4);
		}
		else
		{
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address);
			arm_load_membase(inst, ARM_WORK, ARM_FP,
							 insn->value1->frame_offset + 4);
			arm_store_membase
				(inst, ARM_WORK, ARM_SP, insn->value2->address + 4);
		}
		jit_gen_save_inst_ptr(gen, inst);
	}

JIT_OP_SET_PARAM_STRUCT: note
[reg, imm, scratch reg] -> {
	/* Handle arbitrary-sized structures */
	jit_nint offset = jit_value_get_nint_constant(insn->dest);
	inst = memory_copy(gen, inst, ARM_SP, offset, $1, 0, $2, $3);
}
		
/*
 * Pointer-relative loads and stores.
 */
JIT_OP_LOAD_RELATIVE_SBYTE: 
	[reg] -> {
		arm_load_membase_sbyte(inst, $1, $1, insn->value2->address);
	}

JIT_OP_LOAD_RELATIVE_UBYTE: 
	[reg] -> {
		arm_load_membase_byte(inst, $1, $1, insn->value2->address);
	}

JIT_OP_LOAD_RELATIVE_SHORT: 
	[reg] -> {
		arm_load_membase_short(inst, $1, $1, insn->value2->address);
	}

JIT_OP_LOAD_RELATIVE_USHORT: 
	[reg] -> {
		arm_load_membase_ushort(inst, $1, $1, insn->value2->address);
	}

JIT_OP_LOAD_RELATIVE_INT: 
	[reg] -> {
		arm_load_membase(inst, $1, $1, insn->value2->address);
	}

JIT_OP_LOAD_RELATIVE_LONG:
	[=lreg, reg, imm] -> {
		if($1 == $2)
		{
			arm_mov_reg_membase(inst, %1, $2, $3 + 4, 4);
			arm_mov_reg_membase(inst, $1, $2, $3, 4);
		}
		else
		{
			arm_mov_reg_membase(inst, $1, $2, $3, 4);
			arm_mov_reg_membase(inst, %1, $2, $3 + 4, 4);
		}
	}

JIT_OP_LOAD_RELATIVE_FLOAT32 (JIT_ARM_HAS_VFP):
[=freg32, reg, imm] -> {
	arm_fld_membase(inst, $1, $2, $3, 0);
}

JIT_OP_LOAD_RELATIVE_FLOAT64 (JIT_ARM_HAS_VFP):
[=freg64, reg, imm] -> {
	arm_fld_membase(inst, $1, $2, $3, 1);
}

JIT_OP_LOAD_RELATIVE_NFLOAT: manual
	[] -> {
		/* TODO */
		TODO();
		abort();
	}

JIT_OP_LOAD_RELATIVE_STRUCT: more_space
[=frame, reg, imm, scratch reg] -> {
	inst = memory_copy(gen, inst, ARM_FP, $1, $2, $3, jit_type_get_size(jit_value_get_type(insn->dest)), $4);
}

JIT_OP_STORE_RELATIVE_BYTE: ternary
[imm, imm, imm, scratch reg] -> {
	arm_mov_mem_imm(inst, $1 + $3, $2, 1, $4);
}
[imm, reg, imm] -> {
	arm_mov_mem_reg(inst, $1 + $3, $2, 1);
}
[reg, imm, imm] -> {
	arm_mov_membase_imm(inst, $1, $3, $2, 1, ARM_WORK);
}
[reg, reg, imm] -> {
	arm_mov_membase_reg(inst, $1, $3, $2, 1);
}

JIT_OP_STORE_RELATIVE_SHORT: ternary
[imm, imm, imm, scratch reg] -> {
	arm_mov_mem_imm(inst, $1 + $3, $2, 2, $4);
}
[imm, reg, imm] -> {
	arm_mov_mem_reg(inst, $1 + $3, $2, 2);
}
[reg, imm, imm] -> {
	arm_mov_membase_imm(inst, $1, $3, $2, 2, ARM_WORK);
}
[reg, reg, imm] -> {
	arm_mov_membase_reg(inst, $1, $3, $2, 2);
}

JIT_OP_STORE_RELATIVE_INT: ternary
	[imm, imm, imm, scratch reg] -> {
		arm_mov_mem_imm(inst, $1 + $3, $2, 4, $4);
	}
	[imm, reg, imm] -> {
		arm_mov_mem_reg(inst, $1 + $3, $2, 4);
	}
	[reg, imm, imm] -> {
		arm_mov_membase_imm(inst, $1, $3, $2, 4, ARM_WORK);
	}
	[reg, reg, imm] -> {
		arm_mov_membase_reg(inst, $1, $3, $2, 4);
	}

JIT_OP_STORE_RELATIVE_LONG: ternary
	[reg, imm, imm] -> {
		arm_mov_membase_imm(inst, $1, $3, *(int *)($2), 4, ARM_WORK);
		arm_mov_membase_imm(inst, $1, $3 + 4, *(int *)($2 + 4), 4, ARM_WORK);
	}
	[reg, local, imm, scratch reg] -> {
		arm_mov_reg_membase(inst, $4, ARM_FP, $2, 4);
		arm_mov_membase_reg(inst, $1, $3, $4, 4);
		arm_mov_reg_membase(inst, $4, ARM_FP, $2 + 4, 4);
		arm_mov_membase_reg(inst, $1, $3 + 4, $4, 4);
	}
	[reg, lreg, imm] -> {
		arm_mov_membase_reg(inst, $1, $3, $2, 4);
		arm_mov_membase_reg(inst, $1, $3 + 4, %2, 4);
	}
	
JIT_OP_STORE_RELATIVE_FLOAT32 (JIT_ARM_HAS_VFP): ternary
	[reg, imm, imm] -> {
		arm_mov_membase_imm(inst, $1, $3, ((int *)($2))[0], 4, ARM_WORK);
	}
	[reg, freg32, imm] -> {
		arm_store_membase_float32(inst, $2, $1, $3);
	}

JIT_OP_STORE_RELATIVE_FLOAT64 (JIT_ARM_HAS_VFP): ternary
	[reg, imm, imm, scratch reg] -> {
		arm_mov_membase_imm(inst, $1, $3, ((int *)($2))[0], 4, $4);
		arm_mov_membase_imm(inst, $1, $3 + 4, ((int *)($2))[1], 4, $4);
	}
	[reg, freg64, imm] -> {
		arm_store_membase_float64(inst, $2, $1, $3);
	}

JIT_OP_STORE_RELATIVE_NFLOAT: manual
	[] -> {
		/* TODO */
		TODO();
		abort();
	}

JIT_OP_STORE_RELATIVE_STRUCT: manual
[] -> {
	arm_inst_buf inst;
	int reg = _jit_regs_load_value(gen, insn->dest, 0,
	  (insn->flags & (JIT_INSN_DEST_NEXT_USE |
	  JIT_INSN_DEST_LIVE)));
	_jit_regs_spill_all(gen);
	_jit_gen_fix_value(insn->value1);
	jit_gen_load_inst_ptr(gen, inst);
	_jit_gen_check_space(gen, 128);
	reg = _jit_reg_info[reg].cpu_reg;
	inst = memory_copy(gen, inst, reg, (int)(insn->value2->address),
			ARM_FP, insn->value1->frame_offset,
			jit_type_get_size(jit_value_get_type(insn->value1)), -1);
	jit_gen_save_inst_ptr(gen, inst);
}

JIT_OP_ADD_RELATIVE: 
	[reg] -> {
		if(insn->value2->address != 0)
		{
			arm_alu_reg_imm(inst, ARM_ADD, $1, $1, insn->value2->address);
		}
	}

/*
* Array element loads and stores.
*/
JIT_OP_LOAD_ELEMENT_UBYTE:
[=reg, reg, reg] -> {
	arm_widen_memindex(inst, $1, $2, 0, $3, 0, 0, 0);
}

JIT_OP_LOAD_ELEMENT_USHORT:
[=reg, reg, reg] -> {
	arm_widen_memindex(inst, $1, $2, 0, $3, 1, 0, 1);
}

JIT_OP_LOAD_ELEMENT_INT:
[=reg, reg, reg] -> {
	/* The last parameter is unimportant: it's not used, 
	since the displacement (4th param) is 0 */
	arm_mov_reg_memindex(inst, $1, $2, 0, $3, 2, 4, 0);
}

JIT_OP_LOAD_ELEMENT_LONG:
[=lreg, reg, reg, scratch reg, scratch reg] -> {
	//$1=destination long register (1-st word, LSB)
	//%1=destination long register (2-nd word, MSB)
	//$2=base register
	//$3=index register
	//$4=scratch register for arm_mov_reg_memindex
	//$5=scratch register for overwriting prevention
	
	assert($2 != $3);
	
	int basereg=$2;
	int indexreg=$3;
	
	//Write the 1-st word
	if($1 == basereg)
	{
		//Prevent base reg from being overwritten
		arm_mov_reg_reg(inst, $5, basereg);
		basereg=$5;
	}
	else if ($1 == indexreg)
	{	
		//Prevent index reg from being overwritten
		arm_mov_reg_reg(inst, $5, indexreg);
		indexreg=$5;
	}
	arm_mov_reg_memindex(inst, $1, basereg, 0, indexreg, 3, 4, $4);
	
	//Write the 2-nd word
	arm_mov_reg_memindex(inst, %1, basereg, 4, indexreg, 3, 4, $4);
}

JIT_OP_LOAD_ELEMENT_FLOAT64:
[=freg64, reg, reg, scratch reg] -> {
	arm_fld_memindex(inst, $1, $2, 0, $3, 3, 1, $4);
}

JIT_OP_STORE_ELEMENT_BYTE: ternary
[reg, reg, reg, scratch reg] -> {
	arm_mov_memindex_reg(inst, $1, 0, $2, 0, $3, 1, $4);
}

JIT_OP_STORE_ELEMENT_SHORT: ternary
[reg, reg, reg, scratch reg] -> {
	arm_mov_memindex_reg(inst, $1, 0, $2, 1, $3, 2, $4);
}

JIT_OP_STORE_ELEMENT_INT: ternary
[reg, reg, reg, scratch reg] -> {
	arm_mov_memindex_reg(inst, $1, 0, $2, 2, $3, 4, $4);
}

JIT_OP_STORE_ELEMENT_LONG: ternary
	[reg, reg, imm] -> {
		TODO();
		abort();
		//x86_mov_memindex_imm(inst, $1, 0, $2, 3, *(int *)($3), 4);
		//x86_mov_memindex_imm(inst, $1, 4, $2, 3, *(int *)($3 + 4), 4);
	}
	[reg, reg, local, scratch reg, scratch reg] -> {
		arm_mov_reg_membase(inst, $4, ARM_FP, $3, 4);
		arm_mov_memindex_reg(inst, $1, 0, $2, 3, $4, 4, $5);
		arm_mov_reg_membase(inst, $4, ARM_FP, $3 + 4, 4);
		arm_mov_memindex_reg(inst, $1, 4, $2, 3, $4, 4, $5);
	}
	[reg, reg, lreg, scratch reg] -> {
		arm_mov_memindex_reg(inst, $1, 0, $2, 3, $3, 4, $4);
		arm_mov_memindex_reg(inst, $1, 4, $2, 3, %3, 4, $4);
	}

JIT_OP_STORE_ELEMENT_FLOAT64: ternary
[reg, reg, freg64, scratch reg] -> {
	arm_fst_memindex(inst, $3, $1, 0, $2, 3, 1, $4);
}

/*
* Allocate memory from the stack.
*/
JIT_OP_ALLOCA:
[reg] -> {
	//The ARM stack must always be 4-byte aligned and must be 8-byte aligned at a public interface.
	//Since we don't know when this function will be called, let's align to 8 bytes.
	arm_alu_reg_imm(inst, ARM_ADD, $1, $1, 7);
	arm_alu_reg_imm(inst, ARM_AND, $1, $1, ~7);
	arm_alu_reg_reg(inst, ARM_SUB, ARM_SP, ARM_SP, $1);
	arm_mov_reg_reg(inst, $1, ARM_SP);
	gen->stack_changed = 1;
}

/*
 * Block operations
 */
JIT_OP_MEMCPY: ternary
	[any, any, imm, if("$3 <= 0")] -> { }
	[reg, reg, imm, scratch reg, clobber("r0", "r1", "r2")] ->
	{
		/* 
		 * Call jit_memcpy(dest,src,size).
		 * $1=dest, $2=src, $3=size
		 */
		int dest=$1;
		int src=$2;
		
		if (dest != ARM_R0) {
			if(src==ARM_R0)
			{
				//Prevent overwriting useful data
				arm_mov_reg_reg(inst, $4, src);
				src=$4;
			}
			arm_mov_reg_reg((inst), ARM_R0, dest);
		}
		if (src != ARM_R1) {
			//Move the "src" from wherever it is to where it should be
			arm_mov_reg_reg(inst, ARM_R1, src);
		}
		mov_reg_imm(gen, &(inst), ARM_R2, $3);
	    
		//Call the function
		arm_call(inst, jit_memcpy);
	}
	[reg, reg, reg, scratch reg, clobber("r0", "r1", "r2")] -> {
		/* 
		* Call jit_memcpy(dest,src,size).
		* $1=dest, $2=src, $3=size
		*/
		if ($1 != ARM_R0) {
			if($2==ARM_R0)
			{
				//Prevent overwriting useful data
				arm_mov_reg_reg(inst, $4, $2);
			}
			arm_mov_reg_reg((inst), ARM_R0, $1);
		}
		if ($2 != ARM_R1) {
			if ($2==ARM_R0)
			{
				//Recover previously saved data
				arm_mov_reg_reg(inst, ARM_R1, $4);
			}
			else
			{
				arm_mov_reg_reg((inst), ARM_R1, $2);
			}
		}
		if ($3 != ARM_R2) {
			arm_mov_reg_reg((inst), ARM_R2, $3);
		}
	    
		//Call the function
		arm_call(inst, jit_memcpy);

	}

JIT_OP_MEMSET: ternary
[any, any, imm, if("$3 <= 0")] -> { }
[reg, imm, imm, if("$3 <= 32"), space("32 + $3 * 4")] -> {
	// $1 = pointer to the initial memory location
	// $2 = value to be written in memory
	// $3 = length in bytes
	int disp;
	disp = 0;
	while($3 >= (disp + 4))
	{
		//NB: if 0<A<255, then A*0x01010101 = a 32-bit value where each of its four bytes is A.
		arm_mov_membase_imm(inst, $1, disp, $2 * 0x01010101, 4, ARM_WORK);
		disp += 4;
	}
	if($3 >= (disp + 2))
	{
		arm_mov_membase_imm(inst, $1, disp, $2 * 0x0101, 2, ARM_WORK);
		disp += 2;
	}
	if(insn->value2->address > disp)
	{
		arm_mov_membase_imm(inst, $1, disp, $2, 1, ARM_WORK);
	}
}
[reg, reg, imm, if("$3 < 4")] -> {
	TODO();
	abort();
}
[reg, +reg, imm, scratch reg, if("$3 <= 32 && ($3 % 2) == 0"), space("32 + $3 * 4")] -> {
	// $1 = pointer to the initial memory location
	// $2 = value to be written in memory
	// $3 = length in bytes
	// $4 = scratch register
	int disp;
	arm_mov_reg_reg(inst, $4, $2);
	arm_shift_reg_imm8(inst, ARM_SHL, $2, $2, 8);
	arm_alu_reg_reg(inst, ARM_ORR, $2, $2, $4);
	arm_mov_reg_reg(inst, $4, $2);
	arm_shift_reg_imm8(inst, ARM_SHL, $2, $2, 16);
	arm_alu_reg_reg(inst, ARM_ORR, $2, $2, $4);
	disp = 0;
	while($3 >= (disp + 4))
	{
		arm_mov_membase_reg(inst, $1, disp, $2, 4);
		disp += 4;
	}
	if($3 > disp)
	{
		arm_mov_membase_reg(inst, $1, disp, $2, 2);
	}
}
[reg, +reg, imm, scratch reg,
if("$3 <= 32 && ($3 % 2) != 0"), space("32 + $3 * 4")] -> {
	TODO();
	abort();
}
[reg, reg, reg, clobber("r0", "r1", "r2"), scratch reg] -> {
	// $1 = pointer to the initial memory location
	// $2 = value to be written in memory
	// $3 = length in bytes
	// $4 = scratch register
	
	int pointer=$1;
	int value=$2;
	int length=$3;
	int scratch=$4;
	

	/* Move the outgoing parameters in the right registers (if they are not already where they should be */
	if (pointer != ARM_R0) {
		if(value == ARM_R0)
		{
			//Prevent the value from being overwritten
			arm_mov_reg_reg((inst), scratch, ARM_R0);
			value=scratch;
		}
		else if(length==ARM_R0)
		{
			//Prevent the length from being overwritten
			arm_mov_reg_reg((inst), scratch, ARM_R0);
			length=scratch;
		}
		
		arm_mov_reg_reg((inst), ARM_R0, pointer);
		
		//The register that contained the pointer is now free
		scratch=pointer;
	}
	
	if (value != ARM_R1)
	{
		if (length == ARM_R1)
		{
			//The length is stored in R1. Prevent it from being overwritten
			arm_mov_reg_reg(inst, scratch, length);
			length=scratch;
		}
		
		//Set param 2
		arm_mov_reg_reg((inst), ARM_R1, value);
		
		//The register that contained the value is now free
		scratch=value;
	}
	
	if(length != ARM_R1)
	{
		//Param 3 still isn't in place: move it!
		arm_mov_reg_reg(inst, ARM_R2, length);
	}
	
	arm_call(inst, jit_memset);
}