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Implement V_FFBH_I32 (#3965)

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This commit is contained in:
Marcin Mikołajczyk
2026-01-27 22:08:26 +01:00
committed by GitHub
parent 1473b2358a
commit c81ebe6418
2 changed files with 16 additions and 0 deletions
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1
src/shader_recompiler/frontend/translate/translate.h
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@@ -219,6 +219,7 @@ public:
void V_NOT_B32(const GcnInst& inst);
void V_BFREV_B32(const GcnInst& inst);
void V_FFBH_U32(const GcnInst& inst);
void V_FFBH_I32(const GcnInst& inst);
void V_FFBL_B32(const GcnInst& inst);
void V_FREXP_EXP_I32_F64(const GcnInst& inst);
void V_FREXP_MANT_F64(const GcnInst& inst);

15
src/shader_recompiler/frontend/translate/vector_alu.cpp
View File

@@ -188,6 +188,8 @@ void Translator::EmitVectorAlu(const GcnInst& inst) {
return V_FFBH_U32(inst);
case Opcode::V_FFBL_B32:
return V_FFBL_B32(inst);
case Opcode::V_FFBH_I32:
return V_FFBH_I32(inst);
case Opcode::V_FREXP_EXP_I32_F64:
return V_FREXP_EXP_I32_F64(inst);
case Opcode::V_FREXP_MANT_F64:
@@ -948,6 +950,19 @@ void Translator::V_FFBL_B32(const GcnInst& inst) {
SetDst(inst.dst[0], ir.FindILsb(src0));
}
void Translator::V_FFBH_I32(const GcnInst& inst) {
const IR::U32 src0{GetSrc(inst.src[0])};
// Gcn wants the MSB position counting from the left, but SPIR-V counts from the rightmost (LSB)
// position
const IR::U32 msb_pos = ir.FindSMsb(src0);
const IR::U32 pos_from_left = ir.ISub(ir.Imm32(31), msb_pos);
// Select 0xFFFFFFFF if src0 was 0 or -1
const IR::U32 minusOne = ir.Imm32(~0U);
const IR::U1 cond =
ir.LogicalAnd(ir.INotEqual(src0, ir.Imm32(0)), ir.INotEqual(src0, minusOne));
SetDst(inst.dst[0], IR::U32{ir.Select(cond, pos_from_left, minusOne)});
}
void Translator::V_FREXP_EXP_I32_F64(const GcnInst& inst) {
const IR::F64 src0{GetSrc64<IR::F64>(inst.src[0])};
SetDst(inst.dst[0], ir.FPFrexpExp(src0));