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subreg: Fix PR94123, SVN r273240 causes gcc.target/powerpc/pr87507.c to fail

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Segher's patch that added -fsplit-wide-types-early and enabled by default
for rs6000, caused pr87507.c to FAIL because when running lower-subreg
earlier, we don't see any pseudo-to-pseudo copies of our wide type,
which are created by combine, therefore, we skip decomposing our TImode
accesses.  The fix here is just to always run the third pass of lower-subreg
instead of disabling it if we ran the second pass.

2020-04-01  Peter Bergner  <bergner@linux.ibm.com>

	PR rtl-optimization/94123
	* lower-subreg.c (pass_lower_subreg3::gate): Remove test for
	flag_split_wide_types_early.
This commit is contained in:
Peter Bergner 2020-04-01 14:24:07 -05:00
parent b60bd122dc
commit 7546463b9f
2 changed files with 7 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2020-04-01 Peter Bergner <bergner@linux.ibm.com>
PR rtl-optimization/94123
* lower-subreg.c (pass_lower_subreg3::gate): Remove test for
flag_split_wide_types_early.
2020-04-01 Joerg Sonnenberger <joerg@bec.de>
* doc/extend.texi (Common Function Attributes): Fix typo.

3
gcc/lower-subreg.c
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@ -1844,8 +1844,7 @@ public:
{}
/* opt_pass methods: */
virtual bool gate (function *) { return flag_split_wide_types
&& !flag_split_wide_types_early; }
virtual bool gate (function *) { return flag_split_wide_types; }
virtual unsigned int execute (function *)
{
decompose_multiword_subregs (true);