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emit_x64_vector: SSE implementation of EmitVectorCountLeadingZeros16

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MerryMage 2018-09-22 13:04:44 +01:00
parent 09bf273bc8
commit fd37b637aa
1 changed files with 68 additions and 0 deletions
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68
src/backend/x64/emit_x64_vector.cpp
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@ -636,6 +636,74 @@ void EmitX64::EmitVectorCountLeadingZeros8(EmitContext& ctx, IR::Inst* inst) {
}
void EmitX64::EmitVectorCountLeadingZeros16(EmitContext& ctx, IR::Inst* inst) {
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm zeros = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
code.vpsrlw(tmp, data, 1);
code.vpor(data, data, tmp);
code.vpsrlw(tmp, data, 2);
code.vpor(data, data, tmp);
code.vpsrlw(tmp, data, 4);
code.vpor(data, data, tmp);
code.vpsrlw(tmp, data, 8);
code.vpor(data, data, tmp);
code.vpcmpeqw(zeros, zeros, zeros);
code.vpcmpeqw(tmp, tmp, tmp);
code.vpcmpeqw(zeros, zeros, data);
code.vpmullw(data, data, code.MConst(xword, 0xf0d3f0d3f0d3f0d3, 0xf0d3f0d3f0d3f0d3));
code.vpsllw(tmp, tmp, 15);
code.vpsllw(zeros, zeros, 7);
code.vpsrlw(data, data, 12);
code.vmovdqa(result, code.MConst(xword, 0x0903060a040b0c10, 0x0f080e0207050d01));
code.vpor(tmp, tmp, zeros);
code.vpor(data, data, tmp);
code.vpshufb(result, result, data);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSSE3)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm zeros = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
code.movdqa(tmp, data);
code.psrlw(tmp, 1);
code.por(data, tmp);
code.movdqa(tmp, data);
code.psrlw(tmp, 2);
code.por(data, tmp);
code.movdqa(tmp, data);
code.psrlw(tmp, 4);
code.por(data, tmp);
code.movdqa(tmp, data);
code.psrlw(tmp, 8);
code.por(data, tmp);
code.pcmpeqw(zeros, zeros);
code.pcmpeqw(tmp, tmp);
code.pcmpeqw(zeros, data);
code.pmullw(data, code.MConst(xword, 0xf0d3f0d3f0d3f0d3, 0xf0d3f0d3f0d3f0d3));
code.psllw(tmp, 15);
code.psllw(zeros, 7);
code.psrlw(data, 12);
code.movdqa(result, code.MConst(xword, 0x0903060a040b0c10, 0x0f080e0207050d01));
code.por(tmp, zeros);
code.por(data, tmp);
code.pshufb(result, data);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
EmitOneArgumentFallback(code, ctx, inst, EmitVectorCountLeadingZeros<u16>);
}