From: Julian Seward <jseward@acm.org>
Date: Tue, 26 Mar 2013 13:57:48 +0000 (+0000)
Subject: Add hwcaps checking on amd64 for RDTSCP.  Part of the fix for #251569
X-Git-Tag: svn/VALGRIND_3_9_0~346
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ebe62078c975701b7484dc9cb7cff0dea3816cb;p=thirdparty%2Fvalgrind.git

Add hwcaps checking on amd64 for RDTSCP.  Part of the fix for #251569
and its dups.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13337
---

diff --git a/coregrind/m_machine.c b/coregrind/m_machine.c
index b40cb28196..dce7ee6f86 100644
--- a/coregrind/m_machine.c
+++ b/coregrind/m_machine.c
@@ -768,6 +768,7 @@ Bool VG_(machine_get_hwcaps)( void )
 #elif defined(VGA_amd64)
    { Bool have_sse3, have_cx8, have_cx16;
      Bool have_lzcnt, have_avx /*, have_fma*/;
+     Bool have_rdtscp;
      UInt eax, ebx, ecx, edx, max_extended;
      HChar vstr[13];
      vstr[0] = 0;
@@ -841,12 +842,19 @@ Bool VG_(machine_get_hwcaps)( void )
         VG_(cpuid)(0x80000001, 0, &eax, &ebx, &ecx, &edx);
         have_lzcnt = (ecx & (1<<5)) != 0; /* True => have LZCNT */
      }
+     /* Can we do RDTSCP? */
+     have_rdtscp = False;
+     if (max_extended >= 0x80000001) {
+        VG_(cpuid)(0x80000001, 0, &eax, &ebx, &ecx, &edx);
+        have_rdtscp = (edx & (1<<27)) != 0; /* True => have RDTSVCP */
+     }
 
      va         = VexArchAMD64;
-     vai.hwcaps = (have_sse3  ? VEX_HWCAPS_AMD64_SSE3  : 0)
-                | (have_cx16  ? VEX_HWCAPS_AMD64_CX16  : 0)
-                | (have_lzcnt ? VEX_HWCAPS_AMD64_LZCNT : 0)
-                | (have_avx   ? VEX_HWCAPS_AMD64_AVX   : 0);
+     vai.hwcaps = (have_sse3   ? VEX_HWCAPS_AMD64_SSE3   : 0)
+                | (have_cx16   ? VEX_HWCAPS_AMD64_CX16   : 0)
+                | (have_lzcnt  ? VEX_HWCAPS_AMD64_LZCNT  : 0)
+                | (have_avx    ? VEX_HWCAPS_AMD64_AVX    : 0)
+                | (have_rdtscp ? VEX_HWCAPS_AMD64_RDTSCP : 0);
 
      VG_(machine_get_cache_info)(&vai);