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machinst x64: use xor/xorpss/xorpd to generate zero constants;

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This commit is contained in:
Benjamin Bouvier
2020-07-27 19:26:37 +02:00
committed by Andrew Brown
parent 9a9b5015d0
commit e108f14620
4 changed files with 133 additions and 63 deletions
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4
cranelift/codegen/src/isa/x64/lower.rs
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@@ -1043,7 +1043,7 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
}
Opcode::F64const => {
// TODO use xorpd for 0 and cmpeqpd for all 1s.
// TODO use cmpeqpd for all 1s.
let value = ctx.get_constant(insn).unwrap();
let dst = output_to_reg(ctx, outputs[0]);
for inst in Inst::gen_constant(dst, value, F64, |reg_class, ty| {
@@ -1054,7 +1054,7 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
}
Opcode::F32const => {
// TODO use xorps for 0 and cmpeqps for all 1s.
// TODO use cmpeqps for all 1s.
let value = ctx.get_constant(insn).unwrap();
let dst = output_to_reg(ctx, outputs[0]);
for inst in Inst::gen_constant(dst, value, F32, |reg_class, ty| {