[clang] [Headers][X86] Add a couple of tests for MMX/SSE intrinsics (PR #105852)

[Paul T Robinson via cfe-commits]

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+// RUN: %clang_cc1 -triple i386-unknown-unknown -target-feature +mmx \
+// RUN:  -target-feature +sse2 -O0 -emit-llvm %s -o - | FileCheck %s
+
+// Test that mmx/sse2 shift intrinsics map to the expected builtins.
+
+// Don't include mm_malloc.h, it's system specific.
+#define __MM_MALLOC_H
+
+#include <x86intrin.h>
+
+__m64 check__mm_slli_pi16(__m64 m) {
+  // CHECK-LABEL: @check__mm_slli_pi16
+  // CHECK: @llvm.x86.sse2.pslli.w(<8 x i16> %{{.*}}, i32 {{.*}})
+  return _mm_slli_pi16(m, 8);
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pogo59 wrote:

You are correct, sorry for not checking!

https://github.com/llvm/llvm-project/pull/105852