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fix sched compare regression 

for  gcc/ChangeLog

	PR rtl-optimization/64164
	PR rtl-optimization/67227
	* alias.c (memrefs_conflict_p): Handle VALUEs in PLUS better.
	(nonoverlapping_memrefs_p): Test offsets and sizes when given
	identical gimple_reg exprs.

From-SVN: r227085
This commit is contained in:
Alexandre Oliva 2015-08-21 20:03:14 +00:00 committed by Alexandre Oliva
parent 18c05628a6
commit 2d88904a41
2 changed files with 30 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2015-08-21 Alexandre Oliva <aoliva@redhat.com>
PR rtl-optimization/67227
PR rtl-optimization/64164
* alias.c (memrefs_conflict_p): Handle VALUEs in PLUS better.
(nonoverlapping_memrefs_p): Test offsets and sizes when given
identical gimple_reg exprs.
2015-08-21 Nathan Sidwell <nathan@acm.org>
* config/nvptx/nvptx.md (allocate_stack): Emit sorry during

23
gcc/alias.c
View File

@ -2228,6 +2228,13 @@ memrefs_conflict_p (int xsize, rtx x, int ysize, rtx y, HOST_WIDE_INT c)
rtx x0 = XEXP (x, 0);
rtx x1 = XEXP (x, 1);
/* However, VALUEs might end up in different positions even in
canonical PLUSes. Comparing their addresses is enough. */
if (x0 == y)
return memrefs_conflict_p (xsize, x1, ysize, const0_rtx, c);
else if (x1 == y)
return memrefs_conflict_p (xsize, x0, ysize, const0_rtx, c);
if (GET_CODE (y) == PLUS)
{
/* The fact that Y is canonicalized means that this
@ -2235,6 +2242,11 @@ memrefs_conflict_p (int xsize, rtx x, int ysize, rtx y, HOST_WIDE_INT c)
rtx y0 = XEXP (y, 0);
rtx y1 = XEXP (y, 1);
if (x0 == y1)
return memrefs_conflict_p (xsize, x1, ysize, y0, c);
if (x1 == y0)
return memrefs_conflict_p (xsize, x0, ysize, y1, c);
if (rtx_equal_for_memref_p (x1, y1))
return memrefs_conflict_p (xsize, x0, ysize, y0, c);
if (rtx_equal_for_memref_p (x0, y0))
@ -2263,6 +2275,11 @@ memrefs_conflict_p (int xsize, rtx x, int ysize, rtx y, HOST_WIDE_INT c)
rtx y0 = XEXP (y, 0);
rtx y1 = XEXP (y, 1);
if (x == y0)
return memrefs_conflict_p (xsize, const0_rtx, ysize, y1, c);
if (x == y1)
return memrefs_conflict_p (xsize, const0_rtx, ysize, y0, c);
if (CONST_INT_P (y1))
return memrefs_conflict_p (xsize, x, ysize, y0, c + INTVAL (y1));
else
@ -2518,7 +2535,11 @@ nonoverlapping_memrefs_p (const_rtx x, const_rtx y, bool loop_invariant)
able to do anything about them since no SSA information will have
remained to guide it. */
if (is_gimple_reg (exprx) || is_gimple_reg (expry))
return exprx != expry;
return exprx != expry
|| (moffsetx_known_p && moffsety_known_p
&& MEM_SIZE_KNOWN_P (x) && MEM_SIZE_KNOWN_P (y)
&& !offset_overlap_p (moffsety - moffsetx,
MEM_SIZE (x), MEM_SIZE (y)));
/* With invalid code we can end up storing into the constant pool.
Bail out to avoid ICEing when creating RTL for this.