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Replace interp__builtin_blend with interp__builtin_ia32_shuffle_gener… #170217

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Replace interp__builtin_blend with interp__builtin_ia32_shuffle_gener… #170217

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59b01f6
Replace interp__builtin_blend with interp__builtin_ia32_shuffle_gener…
adbox53 Dec 1, 2025
3bd152f
Merge branch 'main' into builtin-blend-to-shuffle-generic
adbox53 Dec 1, 2025
f66695b
Update clang/lib/AST/ByteCode/InterpBuiltin.cpp
adbox53 Dec 2, 2025
de447f3
Update InterpBuiltin.cpp MaskBit variable
adbox53 Dec 2, 2025
d9bb072
Merge branch 'main' into builtin-blend-to-shuffle-generic
adbox53 Dec 2, 2025
dbf7352
removed interp__builtin_blend from InterpBuiltin.cpp
adbox53 Dec 3, 2025
5f8015e
Merge branch 'main' into builtin-blend-to-shuffle-generic
tbaederr Dec 6, 2025
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43 changes: 9 additions & 34 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2875,39 +2875,6 @@ static bool interp__builtin_select_scalar(InterpState &S,
return true;
}

static bool interp__builtin_blend(InterpState &S, CodePtr OpPC,
const CallExpr *Call) {
APSInt Mask = popToAPSInt(S, Call->getArg(2));
const Pointer &TrueVec = S.Stk.pop<Pointer>();
const Pointer &FalseVec = S.Stk.pop<Pointer>();
const Pointer &Dst = S.Stk.peek<Pointer>();

assert(FalseVec.getNumElems() == TrueVec.getNumElems());
assert(FalseVec.getNumElems() == Dst.getNumElems());
unsigned NumElems = FalseVec.getNumElems();
PrimType ElemT = FalseVec.getFieldDesc()->getPrimType();
PrimType DstElemT = Dst.getFieldDesc()->getPrimType();

for (unsigned I = 0; I != NumElems; ++I) {
bool MaskBit = Mask[I % 8];
if (ElemT == PT_Float) {
assert(DstElemT == PT_Float);
Dst.elem<Floating>(I) =
MaskBit ? TrueVec.elem<Floating>(I) : FalseVec.elem<Floating>(I);
} else {
assert(DstElemT == ElemT);
INT_TYPE_SWITCH_NO_BOOL(DstElemT, {
Dst.elem<T>(I) =
static_cast<T>(MaskBit ? TrueVec.elem<T>(I).toAPSInt()
: FalseVec.elem<T>(I).toAPSInt());
});
}
}
Dst.initializeAllElements();

return true;
}

static bool interp__builtin_ia32_test_op(
InterpState &S, CodePtr OpPC, const CallExpr *Call,
llvm::function_ref<bool(const APInt &A, const APInt &B)> Fn) {
Expand Down Expand Up @@ -4796,7 +4763,15 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
case clang::X86::BI__builtin_ia32_pblendw256:
case clang::X86::BI__builtin_ia32_pblendd128:
case clang::X86::BI__builtin_ia32_pblendd256:
return interp__builtin_blend(S, OpPC, Call);
return interp__builtin_ia32_shuffle_generic(
S, OpPC, Call, [](unsigned DstIdx, unsigned ShuffleMask) {
// Bit index for mask.
unsigned MaskBit = (ShuffleMask >> (DstIdx % 8)) & 0x1;
unsigned SrcVecIdx = MaskBit ? 1 : 0; // 1 = TrueVec, 0 = FalseVec
return std::pair<unsigned, int>{SrcVecIdx, static_cast<int>(DstIdx)};
});



case clang::X86::BI__builtin_ia32_blendvpd:
case clang::X86::BI__builtin_ia32_blendvpd256:
Expand Down