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loop.c (strength_reduce): Disable biv->giv translations and giv recombination.

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* loop.c (strength_reduce): Disable biv->giv translations and
        giv recombination.  For the release branch only.
Should work around 990513-1.c regressions.  Possibly others.  I'll be
running some new tests soon :-)

From-SVN: r27463
This commit is contained in:
Jeffrey A Law
1999-06-10 00:24:42 +00:00
committed by Jeff Law
parent baee0a5374
commit c3d7bab515
2 changed files with 20 additions and 2 deletions
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5
gcc/ChangeLog
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@@ -1,3 +1,8 @@
Thu Jun 10 01:22:59 1999 Jeffrey A Law (law@cygnus.com)
* loop.c (strength_reduce): Disable biv->giv translations and
giv recombination. For the release branch only.
Wed Jun 9 15:57:57 1999 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* rs6000.md (movsi_got_internal_mem): Delete.

17
gcc/loop.c
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@@ -4134,8 +4134,15 @@ strength_reduce (scan_start, end, loop_top, insn_count,
n_extra_increment += bl->biv_count - 1;
/* If the loop contains volatile memory references do not allow any
replacements to take place, since this could loose the volatile markers. */
if (n_extra_increment && ! loop_has_volatile)
replacements to take place, since this could loose the volatile
markers.
Disabled for the gcc-2.95 release. There are still some problems with
giv recombination. We have a patch from Joern which should fix those
problems. But the patch is fairly complex and not really suitable for
the gcc-2.95 branch at this stage. */
if (0 && n_extra_increment && ! loop_has_volatile)
{
int nregs = first_increment_giv + n_extra_increment;
@@ -4740,7 +4747,13 @@ strength_reduce (scan_start, end, loop_top, insn_count,
VARRAY_GROW (reg_iv_type, nregs);
VARRAY_GROW (reg_iv_info, nregs);
}
#if 0
/* Disabled for the gcc-2.95 release. There are still some problems with
giv recombination. We have a patch from Joern which should fix those
problems. But the patch is fairly complex and not really suitable for
the gcc-2.95 branch at this stage. */
recombine_givs (bl, loop_start, loop_end, unroll_p);
#endif
/* Reduce each giv that we decided to reduce. */