[clang] 6c0d5aa - [X86] ExprConstant - correctly detect __builtin_ia32_ucmpw* builtins as unsigned comparisons (#169891)

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Author: Simon Pilgrim
Date: 2025-11-28T10:36:58Z
New Revision: 6c0d5aad7fa8756221a415fc3bf2bb6c7bf974f6

URL: https://github.com/llvm/llvm-project/commit/6c0d5aad7fa8756221a415fc3bf2bb6c7bf974f6
DIFF: https://github.com/llvm/llvm-project/commit/6c0d5aad7fa8756221a415fc3bf2bb6c7bf974f6.diff

LOG: [X86] ExprConstant - correctly detect __builtin_ia32_ucmpw* builtins as unsigned comparisons (#169891)

Fixes typo from #164026

Added: 
    

Modified: 
    clang/lib/AST/ExprConstant.cpp
    clang/test/CodeGen/X86/avx512vlbw-builtins.c

Removed: 
    


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diff  --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index cab17ecdc7b29..b986ee6ca4fa3 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -16978,7 +16978,7 @@ bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
 
     bool IsUnsigned =
         (BuiltinOp >= clang::X86::BI__builtin_ia32_ucmpb128_mask &&
-         BuiltinOp <= clang::X86::BI__builtin_ia32_ucmpq512_mask);
+         BuiltinOp <= clang::X86::BI__builtin_ia32_ucmpw512_mask);
 
     APValue LHS, RHS;
     APSInt Mask, Opcode;

diff  --git a/clang/test/CodeGen/X86/avx512vlbw-builtins.c b/clang/test/CodeGen/X86/avx512vlbw-builtins.c
index 16e113031bfda..f6f27d9c3da3d 100644
--- a/clang/test/CodeGen/X86/avx512vlbw-builtins.c
+++ b/clang/test/CodeGen/X86/avx512vlbw-builtins.c
@@ -475,6 +475,7 @@ __mmask8 test_mm_cmplt_epu16_mask(__m128i __a, __m128i __b) {
   // CHECK: icmp ult <8 x i16> %{{.*}}, %{{.*}}
   return (__mmask8)_mm_cmplt_epu16_mask(__a, __b);
 }
+TEST_CONSTEXPR(_mm_cmplt_epu16_mask(((__m128i)(__v8hu){12351, 47995, 11802, 16970, 16956, 13965, 33529, 18928}), ((__m128i)(__v8hu){48792, 59915, 50576, 62643, 3758, 16415, 7966, 39475})) == (__mmask8)0xAF);
 
 __mmask8 test_mm_mask_cmplt_epu16_mask(__mmask8 __u, __m128i __a, __m128i __b) {
   // CHECK-LABEL: test_mm_mask_cmplt_epu16_mask