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ir: Add opcodes for scalar signed saturated doubling multiplies

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This commit is contained in:
Lioncash
2018-09-05 19:16:41 -04:00
committed by MerryMage
parent 9c03311fed
commit 7ebfd0f31c
4 changed files with 81 additions and 0 deletions
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60
src/backend/x64/emit_x64_saturation.cpp
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@@ -134,6 +134,66 @@ void EmitX64::EmitSignedSaturatedAdd64(EmitContext& ctx, IR::Inst* inst) {
EmitSignedSaturatedOp<Op::Add, 64>(code, ctx, inst);
}
void EmitX64::EmitSignedSaturatedDoublingMultiplyReturnHigh16(EmitContext& ctx, IR::Inst* inst) {
auto overflow_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetOverflowFromOp);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg32 x = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
const Xbyak::Reg32 y = ctx.reg_alloc.UseScratchGpr(args[1]).cvt32();
const Xbyak::Reg32 tmp = ctx.reg_alloc.ScratchGpr().cvt32();
code.movsx(x, x.cvt16());
code.movsx(y, y.cvt16());
code.imul(x, y);
code.lea(y, ptr[x.cvt64() + x.cvt64()]);
code.mov(tmp, x);
code.shr(tmp, 15);
code.xor_(y, x);
code.mov(y, 0x7FFF);
code.cmovns(y, tmp);
if (overflow_inst) {
code.sets(tmp.cvt8());
ctx.reg_alloc.DefineValue(overflow_inst, tmp);
ctx.EraseInstruction(overflow_inst);
}
ctx.reg_alloc.DefineValue(inst, y);
}
void EmitX64::EmitSignedSaturatedDoublingMultiplyReturnHigh32(EmitContext& ctx, IR::Inst* inst) {
auto overflow_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetOverflowFromOp);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg64 x = ctx.reg_alloc.UseScratchGpr(args[0]);
const Xbyak::Reg64 y = ctx.reg_alloc.UseScratchGpr(args[1]);
const Xbyak::Reg64 tmp = ctx.reg_alloc.ScratchGpr();
code.movsxd(x, x.cvt32());
code.movsxd(y, y.cvt32());
code.imul(x, y);
code.lea(y, ptr[x + x]);
code.mov(tmp, x);
code.shr(tmp, 31);
code.xor_(y, x);
code.mov(y.cvt32(), 0x7FFFFFFF);
code.cmovns(y.cvt32(), tmp.cvt32());
if (overflow_inst) {
code.sets(tmp.cvt8());
ctx.reg_alloc.DefineValue(overflow_inst, tmp);
ctx.EraseInstruction(overflow_inst);
}
ctx.reg_alloc.DefineValue(inst, y);
}
void EmitX64::EmitSignedSaturatedSub8(EmitContext& ctx, IR::Inst* inst) {
EmitSignedSaturatedOp<Op::Sub, 8>(code, ctx, inst);
}