public inbox for libc-hacker@sourceware.org
 help / color / mirror / Atom feed
* [PATCH] Fix i386 sysconf at -O3
@ 2006-11-09 23:29 Jakub Jelinek
  0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2006-11-09 23:29 UTC (permalink / raw)
  To: Ulrich Drepper; +Cc: Glibc hackers

Hi!

At least with GCC 4.1.x and -O3 the register pressure on i?86 is too
high with all the inline asm for cpuid.
The following patch cures it and is IMHO desirable anyway, intel_check_word
is quite big and it is wasteful to replicate it 3 times.

2006-11-10  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/i386/sysconf.c (intel_check_word): Add
	noinline attribute.

--- libc/sysdeps/unix/sysv/linux/i386/sysconf.c	2006-11-09 23:07:15.000000000 +0100
+++ libc/sysdeps/unix/sysv/linux/i386/sysconf.c	2006-11-09 23:07:15.000000000 +0100
@@ -139,7 +139,7 @@ intel_02_known_compare (const void *p1, 
 }
 
 
-static long int
+static long int  __attribute__ ((noinline))
 intel_check_word (int name, unsigned int value, bool *has_level_2,
 		  bool *no_level_2_or_3)
 {

	Jakub

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2006-11-09 23:29 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2006-11-09 23:29 [PATCH] Fix i386 sysconf at -O3 Jakub Jelinek

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).