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Implemented UHADD16

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This commit is contained in:
MerryMage 2016-11-26 11:28:20 +00:00
parent 4f7dc81492
commit c0c1bb1094
5 changed files with 36 additions and 1 deletions
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23
src/backend_x64/emit_x64.cpp
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@ -1318,6 +1318,29 @@ void EmitX64::EmitPackedHalvingAddU8(IR::Block& block, IR::Inst* inst) {
code->add(result, xor_a_b);
}
void EmitX64::EmitPackedHalvingAddU16(IR::Block& block, IR::Inst* inst) {
IR::Value a = inst->GetArg(0);
IR::Value b = inst->GetArg(1);
Xbyak::Reg32 reg_a = reg_alloc.UseDefGpr(a, inst).cvt32();
Xbyak::Reg32 reg_b = reg_alloc.UseGpr(b).cvt32();
Xbyak::Reg32 xor_a_b = reg_alloc.ScratchGpr().cvt32();
Xbyak::Reg32 and_a_b = reg_a;
Xbyak::Reg32 result = reg_a;
// This relies on the equality x+y == ((x&y) << 1) + (x^y).
// Note that x^y always contains the LSB of the result.
// Since we want to calculate (x+y)/2, we can instead calculate (x&y) + ((x^y)>>1).
// We mask by 0x7FFF to remove the LSB so that it doesn't leak into the field below.
code->mov(xor_a_b, reg_a);
code->and(and_a_b, reg_b);
code->xor(xor_a_b, reg_b);
code->shr(xor_a_b, 1);
code->and(xor_a_b, 0x7FFF7FFF);
code->add(result, xor_a_b);
}
void EmitX64::EmitPackedSaturatedAddU8(IR::Block& block, IR::Inst* inst) {
EmitPackedOperation(code, reg_alloc, inst, &Xbyak::CodeGenerator::paddusb);
}