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optimise cmp8/16 x, imm; jc

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Fabian 2022-11-04 14:39:56 -06:00
parent d629984627
commit 8f15b554ee
1 changed files with 7 additions and 28 deletions
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35
src/rust/codegen.rs
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@ -1692,37 +1692,16 @@ pub fn gen_getzf(ctx: &mut JitContext, negate: ConditionNegate) {
pub fn gen_getcf(ctx: &mut JitContext, negate: ConditionNegate) {
match &ctx.previous_instruction {
Instruction::Cmp {
dest,
source,
opsize,
} => {
Instruction::Cmp { source, opsize, .. } => {
// TODO: add/sub
// Note: x < y and x < x - y can be used interchangeably (see getcf)
gen_profiler_stat_increment(ctx.builder, profiler::stat::CONDITION_OPTIMISED);
if source == &InstructionOperand::Other || *opsize != OPSIZE_32 {
gen_get_last_op1(ctx.builder, &ctx.previous_instruction);
gen_get_last_result(ctx.builder, &ctx.previous_instruction);
gen_get_last_op1(ctx.builder, &ctx.previous_instruction);
match (opsize, source) {
(&OPSIZE_32, InstructionOperand::WasmLocal(l)) => ctx.builder.get_local(l),
(_, &InstructionOperand::Immediate(i)) => ctx.builder.const_i32(i),
_ => gen_get_last_result(ctx.builder, &ctx.previous_instruction),
}
else {
match dest {
InstructionOperandDest::WasmLocal(l) => {
ctx.builder.get_local(l);
},
InstructionOperandDest::Other => {
gen_get_last_op1(ctx.builder, &ctx.previous_instruction);
},
}
match source {
InstructionOperand::WasmLocal(l) => {
ctx.builder.get_local(l);
},
InstructionOperand::Other => panic!(),
&InstructionOperand::Immediate(i) => {
ctx.builder.const_i32(i);
},
}
}
if negate == ConditionNegate::True {
ctx.builder.geu_i32();
}