r207132 - [X86] Add Clang support for intrinsics __rdtsc and __rdtscp.

[Andrea Di Biagio]

Author: adibiagio
Date: Thu Apr 24 13:26:35 2014
New Revision: 207132

URL: http://llvm.org/viewvc/llvm-project?rev=207132&view=rev
Log:
[X86] Add Clang support for intrinsics __rdtsc and __rdtscp.

This patch:
 1. Adds a definition for two new GCCBuiltins in BuiltinsX86.def:
   __builtin_ia32_rdtsc;
   __builtin_ia32_rdtscp;

 2. Replaces the already existing definition of intrinsic __rdtsc in
    ia32intrin.h with a simple call to the new GCC builtin __builtin_ia32_rdtsc.

 3. Adds a definition for the new intrinsic __rdtscp in ia32intrin.h


Modified:
    cfe/trunk/include/clang/Basic/BuiltinsX86.def
    cfe/trunk/lib/Headers/ia32intrin.h
    cfe/trunk/test/CodeGen/builtins-x86.c

Modified: cfe/trunk/include/clang/Basic/BuiltinsX86.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/BuiltinsX86.def?rev=207132&r1=207131&r2=207132&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/BuiltinsX86.def (original)
+++ cfe/trunk/include/clang/Basic/BuiltinsX86.def Thu Apr 24 13:26:35 2014
@@ -760,5 +760,7 @@ BUILTIN(__builtin_ia32_xbegin, "i", "")
 BUILTIN(__builtin_ia32_xend, "v", "")
 BUILTIN(__builtin_ia32_xabort, "vIc", "")
 BUILTIN(__builtin_ia32_xtest, "i", "")
+BUILTIN(__builtin_ia32_rdtsc, "ULLi", "")
+BUILTIN(__builtin_ia32_rdtscp, "ULLiUi*", "")
 
 #undef BUILTIN

Modified: cfe/trunk/lib/Headers/ia32intrin.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Headers/ia32intrin.h?rev=207132&r1=207131&r2=207132&view=diff
==============================================================================
--- cfe/trunk/lib/Headers/ia32intrin.h (original)
+++ cfe/trunk/lib/Headers/ia32intrin.h Thu Apr 24 13:26:35 2014
@@ -82,9 +82,13 @@ __writeeflags(unsigned int __f)
 /* __rdtsc */
 static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
 __rdtsc(void) {
-  unsigned int __eax, __edx;
-  __asm__ ("rdtsc" : "=a" (__eax), "=d" (__edx));
-  return ((unsigned long long)__edx << 32) | __eax;
+  return __builtin_ia32_rdtsc();
+}
+
+/* __rdtscp */
+static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
+__rdtscp(unsigned int *__A) {
+  return __builtin_ia32_rdtscp(__A);
 }
 
 #define _rdtsc() __rdtsc()

Modified: cfe/trunk/test/CodeGen/builtins-x86.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/builtins-x86.c?rev=207132&r1=207131&r2=207132&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/builtins-x86.c (original)
+++ cfe/trunk/test/CodeGen/builtins-x86.c Thu Apr 24 13:26:35 2014
@@ -263,6 +263,9 @@ void f0() {
   tmp_V4f = __builtin_ia32_cvtpi2ps(tmp_V4f, tmp_V2i);
   tmp_V2i = __builtin_ia32_cvtps2pi(tmp_V4f);
   tmp_i = __builtin_ia32_cvtss2si(tmp_V4f);
+
+  tmp_i = __builtin_ia32_rdtsc();
+  tmp_i = __builtin_ia32_rdtscp(&tmp_Ui);
 #ifdef USE_64
   tmp_LLi = __builtin_ia32_cvtss2si64(tmp_V4f);
 #endif