From: Craig Topper <craig.topper@gmail.com>
Date: Wed, 11 Nov 2015 08:13:33 +0000 (+0000)
Subject: [X86] Add 'pause' builtin that's already in llvm and use it instead of inline assembl... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=eceb4b4fd7ea1e54c6e768f14fb1a6ad6d1684fe;p=clang

[X86] Add 'pause' builtin that's already in llvm and use it instead of inline assembly to implement _mm_pause.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@252712 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/BuiltinsX86.def b/include/clang/Basic/BuiltinsX86.def
index b4c010ed83..cd682f1cf1 100644
--- a/include/clang/Basic/BuiltinsX86.def
+++ b/include/clang/Basic/BuiltinsX86.def
@@ -336,6 +336,7 @@ TARGET_BUILTIN(__builtin_ia32_cvttps2dq, "V4iV4f", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_clflush, "vvC*", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_lfence, "v", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_mfence, "v", "", "sse2")
+TARGET_BUILTIN(__builtin_ia32_pause, "v", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_storedqu, "vc*V16c", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_pmuludq128, "V2LLiV4iV4i", "", "sse2")
 TARGET_BUILTIN(__builtin_ia32_psraw128, "V8sV8sV8s", "", "sse2")
diff --git a/lib/Headers/emmintrin.h b/lib/Headers/emmintrin.h
index 114aa0f351..cfc2c71614 100644
--- a/lib/Headers/emmintrin.h
+++ b/lib/Headers/emmintrin.h
@@ -1481,7 +1481,7 @@ _mm_castsi128_pd(__m128i __a)
 static __inline__ void __DEFAULT_FN_ATTRS
 _mm_pause(void)
 {
-  __asm__ volatile ("pause");
+  __builtin_ia32_pause();
 }
 
 #undef __DEFAULT_FN_ATTRS
diff --git a/test/CodeGen/sse-builtins.c b/test/CodeGen/sse-builtins.c
index fce57b665f..0f964e8055 100644
--- a/test/CodeGen/sse-builtins.c
+++ b/test/CodeGen/sse-builtins.c
@@ -513,3 +513,9 @@ __m64 test_mm_mul_su32(__m64 __a, __m64 __b) {
   // CHECK @llvm.x86.mmx.pmulu.dq(x86_mmx %{{.*}}, x86_mmx %{{.*}})
   return _mm_mul_su32(__a, __b);
 }
+
+void test_mm_pause() {
+  // CHECK-LABEL: @test_mm_pause
+  // CHECK @llvm.x86.sse2.pause()
+  return _mm_pause();
+}