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Fix V_FFBL_B32

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Added check in V_FFBL_B32 to return 0xFFFFFFFF when S0 is zero, similar to V_FFBH_U32.
Otherwise, returns the position of the first low bit (bit 1) from LSB.

Instruction V_FFBL_B32
Description Find first bit low.
D.u = position of first 1 in S0 from LSB; D=0xFFFFFFFF if S0==0.
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DanielSvoboda 2025-02-20 16:36:46 -03:00 committed by GitHub
parent b6baf78812
commit 75b2438167
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1 changed files with 3 additions and 1 deletions
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src/shader_recompiler/frontend/translate/vector_alu.cpp
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@ -837,7 +837,9 @@ void Translator::V_FFBH_U32(const GcnInst& inst) {
void Translator::V_FFBL_B32(const GcnInst& inst) {
const IR::U32 src0{GetSrc(inst.src[0])};
SetDst(inst.dst[0], ir.FindILsb(src0));
// Select 0xFFFFFFFF if src0 was 0
const IR::U1 cond = ir.INotEqual(src0, ir.Imm32(0));
SetDst(inst.dst[0], IR::U32{ir.Select(cond, ir.FindILsb(src0), ir.Imm32(~0U))});
}
void Translator::V_FREXP_EXP_I32_F64(const GcnInst& inst) {