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From: "hjl dot tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/44281] [4.3/4.4/4.5/4.6 Regression] Global Register variable pessimisation
Date: Sat, 11 Sep 2010 13:50:00 -0000	[thread overview]
Message-ID: <20100911134959.26218.qmail@sourceware.org> (raw)
In-Reply-To: <bug-44281-17273@http.gcc.gnu.org/bugzilla/>



------- Comment #3 from hjl dot tools at gmail dot com  2010-09-11 13:49 -------
(In reply to comment #2)
> GCC snapshot has regressed compared to gcc-4.5:
> 
> #include <assert.h>
> #include <stdint.h>
> 
> #define LIKELY(x)   __builtin_expect(!!(x), 1)
> #define UNLIKELY(x) __builtin_expect(!!(x), 0)
> 
> register uint32_t *Iptr __asm__("rbp");
> 
> typedef void (*inst_t)(uint64_t types, uint64_t a, uint64_t b);
> 
> __attribute__ ((noinline)) void dec_helper(uint64_t types, uint64_t a, uint64_t
> b) {
>   assert("FIXME"=="");
> }
> 
> void dec(uint64_t types, uint64_t a, uint64_t b) {
>   if (LIKELY((types & 0xFF) == 1)) {
>     uint32_t next = Iptr[1];
>     --a;
>     ++Iptr;
>     ((inst_t) (uint64_t) next)(types, a, b);
>   } else dec_helper(types, a, b);
> }

This is caused by revision 160124:

http://gcc.gnu.org/ml/gcc-cvs/2010-06/msg00036.html


-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44281


  parent reply	other threads:[~2010-09-11 13:50 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-26  5:12 [Bug regression/44281] New: Global Register variable pessimisation and regression adam at consulting dot net dot nz
2010-06-07  5:36 ` [Bug regression/44281] " adam at consulting dot net dot nz
2010-07-20 22:53 ` [Bug rtl-optimization/44281] [4.3/4.4/4.5/4.6 Regression] Global Register variable pessimisation steven at gcc dot gnu dot org
2010-07-20 22:55 ` pinskia at gcc dot gnu dot org
2010-07-22  8:48 ` rguenth at gcc dot gnu dot org
2010-09-11 11:16 ` adam at consulting dot net dot nz
2010-09-11 13:50 ` hjl dot tools at gmail dot com [this message]
2010-09-12 14:12 ` pinskia at gcc dot gnu dot org
2010-09-13  0:24 ` adam at consulting dot net dot nz
     [not found] <bug-44281-4@http.gcc.gnu.org/bugzilla/>
2011-03-04  7:23 ` adam at consulting dot net.nz
2011-03-04  7:46 ` jakub at gcc dot gnu.org
2011-03-04 10:51 ` adam at consulting dot net.nz
2011-03-04 11:23 ` jakub at gcc dot gnu.org
2011-03-05  2:01 ` adam at consulting dot net.nz

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