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VG_(bzero_inline): handle up to 12 words inline.

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13772
This commit is contained in:
Julian Seward 2014-01-13 00:17:54 +00:00
parent 4c57e7d4d9
commit 3c8017fea0
1 changed files with 13 additions and 1 deletions
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14
include/pub_tool_libcbase.h
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@ -124,7 +124,7 @@ extern void* VG_(memmove)( void *d, const void *s, SizeT sz );
extern void* VG_(memset) ( void *s, Int c, SizeT sz );
extern Int VG_(memcmp) ( const void* s1, const void* s2, SizeT n );
/* Zero out up to 8 words quickly in-line. Do not use this for blocks
/* Zero out up to 12 words quickly in-line. Do not use this for blocks
of size which are unknown at compile time, since the whole point is
for it to be inlined, and then for gcc to remove all code except
for the relevant 'sz' case. */
@ -135,6 +135,18 @@ static void VG_(bzero_inline) ( void* s, SizeT sz )
&& LIKELY(0 == (((Addr)s) & (Addr)(sizeof(UWord)-1)))) {
UWord* p = (UWord*)s;
switch (sz / (SizeT)sizeof(UWord)) {
case 12: p[0] = p[1] = p[2] = p[3]
= p[4] = p[5] = p[6] = p[7]
= p[8] = p[9] = p[10] = p[11] = 0UL; return;
case 11: p[0] = p[1] = p[2] = p[3]
= p[4] = p[5] = p[6] = p[7]
= p[8] = p[9] = p[10] = 0UL; return;
case 10: p[0] = p[1] = p[2] = p[3]
= p[4] = p[5] = p[6] = p[7]
= p[8] = p[9] = 0UL; return;
case 9: p[0] = p[1] = p[2] = p[3]
= p[4] = p[5] = p[6] = p[7]
= p[8] = 0UL; return;
case 8: p[0] = p[1] = p[2] = p[3]
= p[4] = p[5] = p[6] = p[7] = 0UL; return;
case 7: p[0] = p[1] = p[2] = p[3]