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Fix/172104 clang cl simd intrinsics #172116

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Fix/172104 clang cl simd intrinsics #172116

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c688d64
[clang] Enable SSE4.1 intrinsics for Windows MSVC targets - Issue #17…
dev-priyanshu15 Dec 14, 2025
37e45f6
Merge branch 'main' into fix/172104-clang-cl-simd-intrinsics
dev-priyanshu15 Dec 14, 2025
0ec5a43
Merge branch 'main' into fix/172104-clang-cl-simd-intrinsics
dev-priyanshu15 Dec 16, 2025
9f7b95a
Merge branch 'main' into fix/172104-clang-cl-simd-intrinsics
dev-priyanshu15 Dec 16, 2025
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8 changes: 8 additions & 0 deletions clang/lib/Basic/Targets/X86.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -157,6 +157,14 @@ bool X86TargetInfo::initFeatureMap(
if (getTriple().getArch() == llvm::Triple::x86_64)
setFeatureEnabled(Features, "sse2", true);

// Enable SSE4.1 for Windows MSVC targets to support SIMD intrinsics like
// _mm_mullo_epi32 without requiring explicit /arch: flags.
if ((getTriple().getArch() == llvm::Triple::x86_64 ||
getTriple().getArch() == llvm::Triple::x86) &&
getTriple().isWindowsMSVCEnvironment()) {
setFeatureEnabled(Features, "sse4.1", true);
}

using namespace llvm::X86;

SmallVector<StringRef, 16> CPUFeatures;
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18 changes: 18 additions & 0 deletions clang/test/CodeGen/x86-sse41-windows-msvc.c
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@@ -0,0 +1,18 @@
// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -triple i386-pc-windows-msvc -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=LINUX
// RUN: %clang_cc1 -triple i386-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=LINUX

// This test verifies that SSE4.1 is enabled by default for Windows MSVC targets
// to support SIMD intrinsics like _mm_mullo_epi32

#include <immintrin.h>

__m128i test_sse41(void) {
__m128i a = _mm_set1_epi32(5);
__m128i b = _mm_set1_epi32(3);
return _mm_mullo_epi32(a, b);
}

// CHECK: "target-features"="+sse4.1"
// LINUX-NOT: "target-features"="+sse4.1"