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From: <sv...@va...> - 2013-11-23 16:42:04
|
Author: bart
Date: Sat Nov 23 16:41:54 2013
New Revision: 13717
Log:
memcheck/mc_replace_strmem.c: Remove trailing whitespace
Modified:
trunk/memcheck/mc_replace_strmem.c
Modified: trunk/memcheck/mc_replace_strmem.c
==============================================================================
--- trunk/memcheck/mc_replace_strmem.c (original)
+++ trunk/memcheck/mc_replace_strmem.c Sat Nov 23 16:41:54 2013
@@ -9,7 +9,7 @@
This file is part of MemCheck, a heavyweight Valgrind tool for
detecting memory errors.
- Copyright (C) 2000-2013 Julian Seward
+ Copyright (C) 2000-2013 Julian Seward
js...@ac...
This program is free software; you can redistribute it and/or
@@ -105,7 +105,7 @@
*/
-/* Figure out if [dst .. dst+dstlen-1] overlaps with
+/* Figure out if [dst .. dst+dstlen-1] overlaps with
[src .. src+srclen-1].
We assume that the address ranges do not wrap around
(which is safe since on Linux addresses >= 0xC0000000
@@ -132,7 +132,7 @@
else if (loD < loS) {
return !(hiD < loS);
}
- else {
+ else {
/* They start at same place. Since we know neither of them has
zero length, they must overlap. */
return True;
@@ -200,7 +200,7 @@
STRRCHR(VG_Z_LIBC_SONAME, strrchr)
#endif
-
+
/*---------------------- strchr ----------------------*/
@@ -313,10 +313,10 @@
/*---------------------- strlcat ----------------------*/
-/* Append src to dst. n is the size of dst's buffer. dst is guaranteed
- to be nul-terminated after the copy, unless n <= strlen(dst_orig).
- Returns min(n, strlen(dst_orig)) + strlen(src_orig).
- Truncation occurred if retval >= n.
+/* Append src to dst. n is the size of dst's buffer. dst is guaranteed
+ to be nul-terminated after the copy, unless n <= strlen(dst_orig).
+ Returns min(n, strlen(dst_orig)) + strlen(src_orig).
+ Truncation occurred if retval >= n.
*/
#define STRLCAT(soname, fnname) \
SizeT VG_REPLACE_FUNCTION_EZU(20050,soname,fnname) \
@@ -380,7 +380,7 @@
//STRNLEN(VG_Z_LIBC_SONAME, strnlen)
#endif
-
+
/*---------------------- strlen ----------------------*/
@@ -487,7 +487,7 @@
/*---------------------- strlcpy ----------------------*/
-/* Copy up to n-1 bytes from src to dst. Then nul-terminate dst if n > 0.
+/* Copy up to n-1 bytes from src to dst. Then nul-terminate dst if n > 0.
Returns strlen(src). Does not zero-fill the remainder of dst. */
#define STRLCPY(soname, fnname) \
SizeT VG_REPLACE_FUNCTION_EZU(20100,soname,fnname) \
|
|
From: Bart V. A. <bva...@ac...> - 2013-11-23 16:37:20
|
On 11/20/13 22:39, Philippe Waroquiers wrote: > On Wed, 2013-11-20 at 13:24 +0100, Bart Van Assche wrote: >> On 11/19/13 21:20, Philippe Waroquiers wrote: >>> On Tue, 2013-11-19 at 09:08 -0800, Patrick J. LoPresti wrote: >>> >>>> When partial-loads-ok is working correctly, I believe all of >>>> Valgrind's str/mem intercepts are technically unnecessary. True, they >>>> are faster... But that is an argument for intercepting every function >>>> in the C library :-). >>> Not too sure I understand. The str/mem interceptions will usually >>> run slower than the C lib functions (as in most cases, these >>> interceptions run fully on the simulated cpu and are not as >>> optimised as the c lib functions). >> >> If any of the str/mem intercepts would turn out to run significantly >> slower than their optimized equivalents in the C library I will be happy >> to optimize the relevant str/mem intercepts further. > Fair enough. > Would be worth doing > perl perf/vg_perf --vg=../trunk --vg=../new --tool=helgrind,drd --reps=5 > to have first indications of a possible performance impact. I see a slowdown of 1% for "perl tests/vg_regtest helgrind" and a slowdown of 0.5% for "perl tests/vg_regtest drd". Since this patch makes Valgrind easier to maintain I assume that's acceptable ? Bart. |
|
From: <sv...@va...> - 2013-11-23 15:48:27
|
Author: bart
Date: Sat Nov 23 15:48:12 2013
New Revision: 13716
Log:
memcheck: Optimize the memcpy() intercept
This change reduces the time needed to run the memcheck regression tests
with 2% on my development system.
Modified:
trunk/memcheck/mc_replace_strmem.c
Modified: trunk/memcheck/mc_replace_strmem.c
==============================================================================
--- trunk/memcheck/mc_replace_strmem.c (original)
+++ trunk/memcheck/mc_replace_strmem.c Sat Nov 23 15:48:12 2013
@@ -809,7 +809,7 @@
const Addr WM = WS - 1; /* 7 or 3 */ \
\
if (len > 0) { \
- if (dst < src) { \
+ if (dst < src || !is_overlap(dst, src, len, len)) { \
\
/* Copying backwards. */ \
SizeT n = len; \
|