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Fix for powerpc/c4x problem with missed loop optimizations.

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* loop.c (get_condition): Allow combine when either compare is
	VOIDmode.

From-SVN: r22922
This commit is contained in:
Jim Wilson 1998-10-08 12:52:52 +00:00 committed by Jim Wilson
parent 1636b950f9
commit 12f289ac32
2 changed files with 20 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Oct 8 12:50:47 1998 Jim Wilson <wilson@cygnus.com>
* loop.c (get_condition): Allow combine when either compare is
VOIDmode.
Thu Oct 8 11:31:01 PDT 1998 Jeff Law (law@cygnus.com)
* version.c: Bump for snapshot.

20
gcc/loop.c
View File

@ -7765,7 +7765,14 @@ get_condition (jump, earliest)
like Alpha that have an IEEE compliant EQ instruction, and
a non-IEEE compliant BEQ instruction. The use of CCmode is
actually artificial, simply to prevent the combination, but
should not affect other platforms. */
should not affect other platforms.
However, we must allow VOIDmode comparisons to match either
CCmode or non-CCmode comparison, because some ports have
modeless comparisons inside branch patterns.
??? This mode check should perhaps look more like the mode check
in simplify_comparison in combine. */
if ((GET_CODE (SET_SRC (set)) == COMPARE
|| (((code == NE
@ -7783,8 +7790,9 @@ get_condition (jump, earliest)
#endif
))
&& GET_RTX_CLASS (GET_CODE (SET_SRC (set))) == '<'))
&& ((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC)))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
x = SET_SRC (set);
else if (((code == EQ
|| (code == GE
@ -7801,8 +7809,10 @@ get_condition (jump, earliest)
#endif
))
&& GET_RTX_CLASS (GET_CODE (SET_SRC (set))) == '<'
&& ((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC)))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
{
/* We might have reversed a LT to get a GE here. But this wasn't
actually the comparison of data, so we don't flag that we