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From: Julian S. <js...@ac...> - 2010-08-19 13:39:27
|
I just enabled SSE4.2 support by default for 64-bit x86 Linux and MacOSX, in trunk revisions 11267/2011. What I mean is, code querying Valgrind's capabilities by doing a CPUID instruction will now find it claims to support SSE4.1 and SSE4.2. And, indeed, most SSE4.1/4.2 instructions are now supported. Prior to this point CPUID would claim only SSSE3 support. Note that the 32-bit x86 virtual CPU remains at SSSE3 level for the time being. I have tested this using Ubuntu 10.04 (x86_64) and it looks OK to me, but is untested on MacOSX. If you see any changes in behaviour or problems, please let me know. In particular I am on the lookout for: * new false errors from Memcheck in string-related C library routines * any change at all in the behaviour of programs J |
|
From: <sv...@va...> - 2010-08-19 13:25:20
|
Author: sewardj
Date: 2010-08-19 14:25:10 +0100 (Thu, 19 Aug 2010)
New Revision: 2011
Log:
Enable SSE 4.1 and 4.2 by default on x86_64. (x86 remains stuck
at SSE3, at least for the time being.)
Modified:
trunk/priv/guest_amd64_toIR.c
Modified: trunk/priv/guest_amd64_toIR.c
===================================================================
--- trunk/priv/guest_amd64_toIR.c 2010-08-17 22:52:08 UTC (rev 2010)
+++ trunk/priv/guest_amd64_toIR.c 2010-08-19 13:25:10 UTC (rev 2011)
@@ -17513,11 +17513,11 @@
if (haveF2orF3(pfx)) goto decode_failure;
if (archinfo->hwcaps == (VEX_HWCAPS_AMD64_SSE3
|VEX_HWCAPS_AMD64_CX16)) {
- fName = "amd64g_dirtyhelper_CPUID_sse3_and_cx16";
- fAddr = &amd64g_dirtyhelper_CPUID_sse3_and_cx16;
+ //fName = "amd64g_dirtyhelper_CPUID_sse3_and_cx16";
+ //fAddr = &amd64g_dirtyhelper_CPUID_sse3_and_cx16;
/* This is a Core-2-like machine */
- //fName = "amd64g_dirtyhelper_CPUID_sse42_and_cx16";
- //fAddr = &amd64g_dirtyhelper_CPUID_sse42_and_cx16;
+ fName = "amd64g_dirtyhelper_CPUID_sse42_and_cx16";
+ fAddr = &amd64g_dirtyhelper_CPUID_sse42_and_cx16;
/* This is a Core-i5-like machine */
}
else {
|
|
From: <sv...@va...> - 2010-08-19 13:22:43
|
Author: sewardj
Date: 2010-08-19 14:22:34 +0100 (Thu, 19 Aug 2010)
New Revision: 11268
Log:
Add intercepts for strstr, strpbrk, strcspn. These are needed for
glibc-2.11 when running on SSE4-enabled (virtual) CPUs, for the usual
reason: to avoid ultra-optimised routines using the SSE 4.2 PCMPxSTRx
instructions. I would not be surprised if it turned out that strspn
was required, but I haven't seen a need for it so far.
Modified:
trunk/memcheck/mc_replace_strmem.c
Modified: trunk/memcheck/mc_replace_strmem.c
===================================================================
--- trunk/memcheck/mc_replace_strmem.c 2010-08-17 22:43:21 UTC (rev 11267)
+++ trunk/memcheck/mc_replace_strmem.c 2010-08-19 13:22:34 UTC (rev 11268)
@@ -867,6 +867,123 @@
GLIBC26___MEMCPY_CHK(VG_Z_LIBC_SONAME, __memcpy_chk)
+#define STRSTR(soname, fnname) \
+ void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* haystack, void* needle); \
+ void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* haystack, void* needle) \
+ { \
+ UChar* h = (UChar*)haystack; \
+ UChar* n = (UChar*)needle; \
+ \
+ /* find the length of n, not including terminating zero */ \
+ UWord nlen = 0; \
+ while (n[nlen]) nlen++; \
+ \
+ /* if n is the empty string, match immediately. */ \
+ if (nlen == 0) return h; \
+ \
+ /* assert(nlen >= 1); */ \
+ UChar n0 = n[0]; \
+ \
+ while (1) { \
+ UChar hh = *h; \
+ if (hh == 0) return NULL; \
+ if (hh != n0) { h++; continue; } \
+ \
+ UWord i; \
+ for (i = 0; i < nlen; i++) { \
+ if (n[i] != h[i]) \
+ break; \
+ } \
+ /* assert(i >= 0 && i <= nlen); */ \
+ if (i == nlen) \
+ return h; \
+ \
+ h++; \
+ } \
+ }
+
+#if defined(VGO_linux)
+STRSTR(VG_Z_LIBC_SONAME, strstr)
+#endif
+
+
+#define STRPBRK(soname, fnname) \
+ void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* sV, void* acceptV); \
+ void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* sV, void* acceptV) \
+ { \
+ UChar* s = (UChar*)sV; \
+ UChar* accept = (UChar*)acceptV; \
+ \
+ /* find the length of 'accept', not including terminating zero */ \
+ UWord nacc = 0; \
+ while (accept[nacc]) nacc++; \
+ \
+ /* if n is the empty string, fail immediately. */ \
+ if (nacc == 0) return NULL; \
+ \
+ /* assert(nacc >= 1); */ \
+ while (1) { \
+ UWord i; \
+ UChar sc = *s; \
+ if (sc == 0) \
+ break; \
+ for (i = 0; i < nacc; i++) { \
+ if (sc == accept[i]) \
+ return s; \
+ } \
+ s++; \
+ } \
+ \
+ return NULL; \
+ }
+
+#if defined(VGO_linux)
+STRPBRK(VG_Z_LIBC_SONAME, strpbrk)
+#endif
+
+
+#define STRCSPN(soname, fnname) \
+ SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* sV, void* rejectV); \
+ SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ (void* sV, void* rejectV) \
+ { \
+ UChar* s = (UChar*)sV; \
+ UChar* reject = (UChar*)rejectV; \
+ \
+ /* find the length of 'reject', not including terminating zero */ \
+ UWord nrej = 0; \
+ while (reject[nrej]) nrej++; \
+ \
+ UWord len = 0; \
+ while (1) { \
+ UWord i; \
+ UChar sc = *s; \
+ if (sc == 0) \
+ break; \
+ for (i = 0; i < nrej; i++) { \
+ if (sc == reject[i]) \
+ break; \
+ } \
+ /* assert(i >= 0 && i <= nrej); */ \
+ if (i < nrej) \
+ break; \
+ s++; \
+ len++; \
+ } \
+ \
+ return len; \
+ }
+
+#if defined(VGO_linux)
+STRCSPN(VG_Z_LIBC_SONAME, strcspn)
+#endif
+
+
/*------------------------------------------------------------*/
/*--- Improve definedness checking of process environment ---*/
/*------------------------------------------------------------*/
|