[Bug rtl-optimization/41917] Strange athrithmetic result with -O3

2009-11-03 Thread jakub at gcc dot gnu dot org 


--- Comment #4 from jakub at gcc dot gnu dot org  2009-11-03 22:40 ---
Subject: Bug 41917

Author: jakub
Date: Tue Nov  3 22:40:08 2009
New Revision: 153875

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=153875
Log:
PR rtl-optimization/41917
* rtlanal.c (num_sign_bit_copies1) : If sign bit of second
operand isn't known to be 0, return 1.

* gcc.c-torture/execute/pr41917.c: New test.

Added:
branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/execute/pr41917.c
Modified:
branches/gcc-4_4-branch/gcc/ChangeLog
branches/gcc-4_4-branch/gcc/rtlanal.c
branches/gcc-4_4-branch/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41917

[Bug rtl-optimization/41917] Strange athrithmetic result with -O3

2009-11-03 Thread jakub at gcc dot gnu dot org 


--- Comment #3 from jakub at gcc dot gnu dot org  2009-11-03 22:36 ---
Subject: Bug 41917

Author: jakub
Date: Tue Nov  3 22:36:39 2009
New Revision: 153874

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=153874
Log:
PR rtl-optimization/41917
* rtlanal.c (num_sign_bit_copies1) : If sign bit of second
operand isn't known to be 0, return 1.

* gcc.c-torture/execute/pr41917.c: New test.

Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr41917.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/rtlanal.c
trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41917

[Bug rtl-optimization/41917] Strange athrithmetic result with -O3

2009-11-14 Thread mikpe at it dot uu dot se 


--- Comment #5 from mikpe at it dot uu dot se  2009-11-14 16:32 ---
This wrong-code bug also occurs with 4.3.4 on i686-linux, but not with 4.2.4 or
4.1.2, making it a regression. The patch for 4.4 applies cleanly to 4.3 and
fixes the bug there with no new regressions (I tested i686, powerpc64, and
arm).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41917

[Bug rtl-optimization/41917] Strange athrithmetic result with -O3

2009-11-14 Thread jakub at gcc dot gnu dot org 


-- 

jakub at gcc dot gnu dot org changed:

   What|Removed |Added

 AssignedTo|jakub at gcc dot gnu dot org|unassigned at gcc dot gnu
   ||dot org
 Status|ASSIGNED|NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41917