[Bug rtl-optimization/33928] [4.3/4.4/4.5 Regression] 30% performance slowdown in floating-point code caused by r118475

["lucier at math dot purdue dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #63 from lucier at math dot purdue dot edu  2009-05-06 19:57 -------
Was the patch in comment 55 meant for me to bootstrap and test with today's
mainline?  It crashes at the gcc_assert at

/* Subroutine of canon_reg.  Pass *XLOC through canon_reg, and validate
   the result if necessary.  INSN is as for canon_reg.  */

static void
validate_canon_reg (rtx *xloc, rtx insn)
{
  if (*xloc)
    {
      rtx new_rtx = canon_reg (*xloc, insn);

      /* If replacing pseudo with hard reg or vice versa, ensure the
         insn remains valid.  Likewise if the insn has MATCH_DUPs.  */
      gcc_assert (insn && new_rtx);
      validate_change (insn, xloc, new_rtx, 1);
    }
}

when building libgcc:

/tmp/lucier/gcc/objdirs/mainline/./gcc/xgcc
-B/tmp/lucier/gcc/objdirs/mainline/./gcc/
-B/pkgs/gcc-mainline/x86_64-unknown-linux-gnu/bin/
-B/pkgs/gcc-mainline/x86_64-unknown-linux-gnu/lib/ -isystem
/pkgs/gcc-mainline/x86_64-unknown-linux-gnu/include -isystem
/pkgs/gcc-mainline/x86_64-unknown-linux-gnu/sys-include -g -O2 -m32 -O2  -g -O2
-DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wcast-qual -Wold-style-definition  -isystem ./include  -fPIC -g
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED   -I. -I.
-I../../.././gcc -I../../../../../mainline/libgcc
-I../../../../../mainline/libgcc/. -I../../../../../mainline/libgcc/../gcc
-I../../../../../mainline/libgcc/../include
-I../../../../../mainline/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS -DUSE_TLS -o _moddi3.o -MT _moddi3.o -MD -MP -MF _moddi3.dep
-DL_moddi3 -c ../../../../../mainline/libgcc/../gcc/libgcc2.c \
          -fexceptions -fnon-call-exceptions -fvisibility=hidden -DHIDE_EXPORTS
../../../../../mainline/libgcc/../gcc/libgcc2.c: In function â:
../../../../../mainline/libgcc/../gcc/libgcc2.c:1121: internal compiler error:
in validate_canon_reg, at cse.c:2730


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928