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x64: lower i8x16.shuffle to VPERMI2B when possible

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When shuffling values from two different registers, the x64 lowering for
`i8x16.shuffle` must first shuffle each register separately and then OR
the results with SSE instructions. With `VPERMI2B`, available in
AVX512VL + AVX512VBMI, this can be done in a single instruction after
the shuffle mask has been moved into the destination register. This
change uses `VPERMI2B` for that case when the CPU supports it.
This commit is contained in:
Andrew Brown
2021-05-24 10:06:33 -07:00
parent 51edea9e57
commit 2a9f458ea3
7 changed files with 100 additions and 35 deletions
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13
cranelift/codegen/src/isa/x64/inst/emit_tests.rs
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@@ -3573,6 +3573,18 @@ fn test_x64_emit() {
"vpmullq %xmm14, %xmm10, %xmm1",
));
insns.push((
Inst::xmm_rm_r_evex(Avx512Opcode::Vpermi2b, RegMem::reg(xmm14), xmm10, w_xmm1),
"62D22D0875CE",
"vpermi2b %xmm14, %xmm10, %xmm1",
));
insns.push((
Inst::xmm_rm_r_evex(Avx512Opcode::Vpermi2b, RegMem::reg(xmm1), xmm0, w_xmm2),
"62F27D0875D1",
"vpermi2b %xmm1, %xmm0, %xmm2",
));
insns.push((
Inst::xmm_rm_r(SseOpcode::Pmuludq, RegMem::reg(xmm8), w_xmm9),
"66450FF4C8",
@@ -4315,6 +4327,7 @@ fn test_x64_emit() {
isa_flag_builder.enable("has_avx512f").unwrap();
isa_flag_builder.enable("has_avx512dq").unwrap();
isa_flag_builder.enable("has_avx512vl").unwrap();
isa_flag_builder.enable("has_avx512vbmi").unwrap();
let isa_flags = x64::settings::Flags::new(&flags, isa_flag_builder);
let rru = regs::create_reg_universe_systemv(&flags);