[clang] [X86][Clang] Add constexpr support for _mm_min_ss/_mm_max_ss/_mm_min_sd/_mm_max_sd/_mm_min_sh/_mm_max_sh intrinsics (PR #178029)

[Simon Pilgrim via cfe-commits]

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@@ -5845,6 +5889,46 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
           return llvm::maximum(A, B);
         });
 
+  case clang::X86::BI__builtin_ia32_minss:
+  case clang::X86::BI__builtin_ia32_minsd:
+  case clang::X86::BI__builtin_ia32_minsh:
+    return interp__builtin_elementwise_fp_binop(
+        S, OpPC, Call,
+        [](const APFloat &A, const APFloat &B, std::optional<APSInt>) {
+          if (A.isZero() && B.isZero())
+            return B;
+          return llvm::minimum(A, B);
+        },
+        /*IsScalar=*/true);
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RKSimon wrote:

(pedantic) keep the minimum / maximum intrinsics closer together

https://github.com/llvm/llvm-project/pull/178029