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gcse.c (compute_ld_motion_mems): If a non-simple MEM is found in a REG_EQUAL note, invalidate it. 

* gcse.c (compute_ld_motion_mems): If a non-simple MEM is
       found in a REG_EQUAL note, invalidate it.

From-SVN: r199049
This commit is contained in:
Julian Brown 2013-05-18 03:48:18 +00:00 committed by Jeff Law
parent 933f507d1f
commit 2df013f3cd
2 changed files with 16 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2013-05-17 Julian Brown <julian@codesourcery.com>
* gcse.c (compute_ld_motion_mems): If a non-simple MEM is
found in a REG_EQUAL note, invalidate it.
2013-05-17 Easwaran Raman <eraman@google.com>
* tree-ssa-reassoc.c (find_insert_point): New function.

11
gcc/gcse.c
View File

@ -3894,6 +3894,8 @@ compute_ld_motion_mems (void)
{
rtx src = SET_SRC (PATTERN (insn));
rtx dest = SET_DEST (PATTERN (insn));
rtx note = find_reg_equal_equiv_note (insn);
rtx src_eq;
/* Check for a simple LOAD... */
if (MEM_P (src) && simple_mem (src))
@ -3910,6 +3912,15 @@ compute_ld_motion_mems (void)
invalidate_any_buried_refs (src);
}
if (note != 0 && REG_NOTE_KIND (note) == REG_EQUAL)
src_eq = XEXP (note, 0);
else
src_eq = NULL_RTX;
if (src_eq != NULL_RTX
&& !(MEM_P (src_eq) && simple_mem (src_eq)))
invalidate_any_buried_refs (src_eq);
/* Check for stores. Don't worry about aliased ones, they
will block any movement we might do later. We only care
about this exact pattern since those are the only