[Bug rtl-optimization/62151] [5 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62151

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Thu Oct  2 02:18:01 2014
New Revision: 215789

URL: https://gcc.gnu.org/viewcvs?rev=215789&root=gcc&view=rev
Log:
2014-10-01  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/
    PR rtl-optimization/62151
    * combine.c (can_combine_p): Allow the destination register of INSN
    to be clobbered in I3.
    (subst): Do not substitute into clobbers of registers.

gcc/testsuite/
    * gcc.dg/combine-clobber.c: New.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog