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[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow insertps intrinsic to be used in constexp #165513

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Merged
RKSimon merged 12 commits into from
Oct 30, 2025
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[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow insertps intrinsic to be used in constexp #165513

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eca52c0
feat: VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - Allow i…
ahmednoursphinx Oct 28, 2025
3e19fbc
Merge branch 'main' into issue_165161
ahmednoursphinx Oct 29, 2025
578e7f7
chore: apply formatting
ahmednoursphinx Oct 29, 2025
11e06ea
chore: PR Feedback
ahmednoursphinx Oct 30, 2025
b1b98bd
chore: Format files
ahmednoursphinx Oct 30, 2025
8d583eb
Merge branch 'main' into issue_165161
ahmednoursphinx Oct 30, 2025
1f9be61
Merge branch 'main' into issue_165161
ahmednoursphinx Oct 30, 2025
d0d2276
chore: PR Feedback
ahmednoursphinx Oct 30, 2025
0ea23e5
Merge branch 'issue_165161' of https://github.com/ahmednoursphinx/llv…
ahmednoursphinx Oct 30, 2025
3ce9b61
Merge branch 'main' into issue_165161
RKSimon Oct 30, 2025
9eacdf5
Merge branch 'main' into issue_165161
RKSimon Oct 30, 2025
b16ad15
Merge branch 'main' into issue_165161
ahmednoursphinx Oct 30, 2025
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3 changes: 2 additions & 1 deletion clang/include/clang/Basic/BuiltinsX86.td
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Original file line number Diff line number Diff line change
Expand Up @@ -328,7 +328,6 @@ let Features = "ssse3", Attributes = [NoThrow, Const, Constexpr, RequiredVectorW
}

let Features = "sse4.1", Attributes = [NoThrow, Const, RequiredVectorWidth<128>] in {
def insertps128 : X86Builtin<"_Vector<4, float>(_Vector<4, float>, _Vector<4, float>, _Constant char)">;
def roundps : X86Builtin<"_Vector<4, float>(_Vector<4, float>, _Constant int)">;
def roundss : X86Builtin<"_Vector<4, float>(_Vector<4, float>, _Vector<4, float>, _Constant int)">;
def roundsd : X86Builtin<"_Vector<2, double>(_Vector<2, double>, _Vector<2, double>, _Constant int)">;
Expand All @@ -342,6 +341,8 @@ let Features = "sse4.1", Attributes = [NoThrow, Const, RequiredVectorWidth<128>]

let Features = "sse4.1",
Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<128>] in {
def insertps128 : X86Builtin<"_Vector<4, float>(_Vector<4, float>, "
"_Vector<4, float>, _Constant char)">;
def ptestz128
: X86Builtin<"int(_Vector<2, long long int>, _Vector<2, long long int>)">;
def ptestc128
Expand Down
42 changes: 37 additions & 5 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3411,7 +3411,7 @@ static bool interp__builtin_x86_byteshift(

static bool interp__builtin_ia32_shuffle_generic(
InterpState &S, CodePtr OpPC, const CallExpr *Call,
llvm::function_ref<std::pair<unsigned, unsigned>(unsigned, unsigned)>
llvm::function_ref<std::pair<unsigned, int>(unsigned, unsigned)>
GetSourceIndex) {

assert(Call->getNumArgs() == 3);
Expand All @@ -3428,8 +3428,19 @@ static bool interp__builtin_ia32_shuffle_generic(

for (unsigned DstIdx = 0; DstIdx != NumElems; ++DstIdx) {
auto [SrcVecIdx, SrcIdx] = GetSourceIndex(DstIdx, ShuffleMask);
const Pointer &Src = (SrcVecIdx == 0) ? A : B;
TYPE_SWITCH(ElemT, { Dst.elem<T>(DstIdx) = Src.elem<T>(SrcIdx); });

if (SrcIdx < 0) {
// Zero out this element
if (ElemT == PT_Float) {
Dst.elem<Floating>(DstIdx) = Floating(
S.getASTContext().getFloatTypeSemantics(VecT->getElementType()));
} else {
INT_TYPE_SWITCH_NO_BOOL(ElemT, { Dst.elem<T>(DstIdx) = T::from(0); });
}
} else {
const Pointer &Src = (SrcVecIdx == 0) ? A : B;
TYPE_SWITCH(ElemT, { Dst.elem<T>(DstIdx) = Src.elem<T>(SrcIdx); });
}
}
Dst.initializeAllElements();

Expand Down Expand Up @@ -4382,7 +4393,8 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
unsigned SrcIdx = ElemInLane >= NumSelectableElems ? 1 : 0;
unsigned BitIndex = (DstIdx * BitsPerElem) % MaskBits;
unsigned Index = (ShuffleMask >> BitIndex) & IndexMask;
return std::pair<unsigned, unsigned>{SrcIdx, LaneOffset + Index};
return std::pair<unsigned, int>{SrcIdx,
static_cast<int>(LaneOffset + Index)};
});
case X86::BI__builtin_ia32_shufpd:
case X86::BI__builtin_ia32_shufpd256:
Expand All @@ -4400,7 +4412,27 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
unsigned SrcIdx = ElemInLane >= NumSelectableElems ? 1 : 0;
unsigned BitIndex = (DstIdx * BitsPerElem) % MaskBits;
unsigned Index = (ShuffleMask >> BitIndex) & IndexMask;
return std::pair<unsigned, unsigned>{SrcIdx, LaneOffset + Index};
return std::pair<unsigned, int>{SrcIdx,
static_cast<int>(LaneOffset + Index)};
});
case X86::BI__builtin_ia32_insertps128:
return interp__builtin_ia32_shuffle_generic(
S, OpPC, Call, [](unsigned DstIdx, unsigned Mask) {
// Bits [3:0]: zero mask - if bit is set, zero this element
if ((Mask & (1 << DstIdx)) != 0) {
return std::pair<unsigned, int>{0, -1};
}
// Bits [7:6]: select element from source vector Y (0-3)
// Bits [5:4]: select destination position (0-3)
unsigned SrcElem = (Mask >> 6) & 0x3;
unsigned DstElem = (Mask >> 4) & 0x3;
if (DstIdx == DstElem) {
// Insert element from source vector (B) at this position
return std::pair<unsigned, int>{1, static_cast<int>(SrcElem)};
} else {
// Copy from destination vector (A)
return std::pair<unsigned, int>{0, static_cast<int>(DstIdx)};
}
});
case X86::BI__builtin_ia32_pshufb128:
case X86::BI__builtin_ia32_pshufb256:
Expand Down
46 changes: 39 additions & 7 deletions clang/lib/AST/ExprConstant.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11621,7 +11621,7 @@ static bool evalPackBuiltin(const CallExpr *E, EvalInfo &Info, APValue &Result,

static bool evalShuffleGeneric(
EvalInfo &Info, const CallExpr *Call, APValue &Out,
llvm::function_ref<std::pair<unsigned, unsigned>(unsigned, unsigned)>
llvm::function_ref<std::pair<unsigned, int>(unsigned, unsigned)>
GetSourceIndex) {

const auto *VT = Call->getType()->getAs<VectorType>();
Expand All @@ -11644,8 +11644,16 @@ static bool evalShuffleGeneric(

for (unsigned DstIdx = 0; DstIdx != NumElts; ++DstIdx) {
auto [SrcVecIdx, SrcIdx] = GetSourceIndex(DstIdx, ShuffleMask);
const APValue &Src = (SrcVecIdx == 0) ? A : B;
ResultElements.push_back(Src.getVectorElt(SrcIdx));

if (SrcIdx < 0) {
// Zero out this element
QualType ElemTy = VT->getElementType();
ResultElements.push_back(
APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy))));
} else {
const APValue &Src = (SrcVecIdx == 0) ? A : B;
ResultElements.push_back(Src.getVectorElt(SrcIdx));
}
}

Out = APValue(ResultElements.data(), ResultElements.size());
Expand Down Expand Up @@ -12438,7 +12446,7 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (!evalShuffleGeneric(
Info, E, R,
[](unsigned DstIdx,
unsigned ShuffleMask) -> std::pair<unsigned, unsigned> {
unsigned ShuffleMask) -> std::pair<unsigned, int> {
constexpr unsigned LaneBits = 128u;
unsigned NumElemPerLane = LaneBits / 32;
unsigned NumSelectableElems = NumElemPerLane / 2;
Expand All @@ -12451,7 +12459,7 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr *E) {
unsigned BitIndex = (DstIdx * BitsPerElem) % MaskBits;
unsigned SrcIdx = (ElemInLane < NumSelectableElems) ? 0 : 1;
unsigned Index = (ShuffleMask >> BitIndex) & IndexMask;
return {SrcIdx, LaneOffset + Index};
return {SrcIdx, static_cast<int>(LaneOffset + Index)};
}))
return false;
return Success(R, E);
Expand All @@ -12463,7 +12471,7 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (!evalShuffleGeneric(
Info, E, R,
[](unsigned DstIdx,
unsigned ShuffleMask) -> std::pair<unsigned, unsigned> {
unsigned ShuffleMask) -> std::pair<unsigned, int> {
constexpr unsigned LaneBits = 128u;
unsigned NumElemPerLane = LaneBits / 64;
unsigned NumSelectableElems = NumElemPerLane / 2;
Expand All @@ -12476,7 +12484,31 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr *E) {
unsigned BitIndex = (DstIdx * BitsPerElem) % MaskBits;
unsigned SrcIdx = (ElemInLane < NumSelectableElems) ? 0 : 1;
unsigned Index = (ShuffleMask >> BitIndex) & IndexMask;
return {SrcIdx, LaneOffset + Index};
return {SrcIdx, static_cast<int>(LaneOffset + Index)};
}))
return false;
return Success(R, E);
}
case X86::BI__builtin_ia32_insertps128: {
APValue R;
if (!evalShuffleGeneric(
Info, E, R,
[](unsigned DstIdx, unsigned Mask) -> std::pair<unsigned, int> {
// Bits [3:0]: zero mask - if bit is set, zero this element
if ((Mask & (1 << DstIdx)) != 0) {
return {0, -1};
}
// Bits [7:6]: select element from source vector Y (0-3)
// Bits [5:4]: select destination position (0-3)
unsigned SrcElem = (Mask >> 6) & 0x3;
unsigned DstElem = (Mask >> 4) & 0x3;
if (DstIdx == DstElem) {
// Insert element from source vector (B) at this position
return {1, static_cast<int>(SrcElem)};
} else {
// Copy from destination vector (A)
return {0, static_cast<int>(DstIdx)};
}
}))
return false;
return Success(R, E);
Expand Down
10 changes: 10 additions & 0 deletions clang/test/CodeGen/X86/sse41-builtins.c
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Expand Up @@ -307,6 +307,16 @@ __m128 test_mm_insert_ps(__m128 x, __m128 y) {
return _mm_insert_ps(x, y, 4);
}

TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x10), 1.0f, 10.0f, 3.0f, 4.0f))); // Insert Y[0] into X[1]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x00), 10.0f, 2.0f, 3.0f, 4.0f))); // Insert Y[0] into X[0]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x20), 1.0f, 2.0f, 10.0f, 4.0f))); // Insert Y[0] into X[2]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x30), 1.0f, 2.0f, 3.0f, 10.0f))); // Insert Y[0] into X[3]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x80), 30.0f, 2.0f, 3.0f, 4.0f))); // Insert Y[2] into X[0]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x01), 0.0f, 2.0f, 3.0f, 4.0f))); // Insert Y[0] into X[0], zero X[0]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x0A), 10.0f, 0.0f, 3.0f, 0.0f))); // Insert Y[0] into X[0], zero X[1] and X[3]
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0x0F), 0.0f, 0.0f, 0.0f, 0.0f))); // Insert Y[0] into X[0], zero all
TEST_CONSTEXPR((match_m128(_mm_insert_ps(((__m128)(__v4sf){1.0f, 2.0f, 3.0f, 4.0f}), ((__m128)(__v4sf){10.0f, 20.0f, 30.0f, 40.0f}), 0xCF), 0.0f, 0.0f, 0.0f, 0.0f))); // Insert Y[3] into X[0], zero all

__m128i test_mm_max_epi8(__m128i x, __m128i y) {
// CHECK-LABEL: test_mm_max_epi8
// CHECK: call <16 x i8> @llvm.smax.v16i8(<16 x i8> %{{.*}}, <16 x i8> %{{.*}})
Expand Down
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