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alias.c (nonoverlapping_memrefs_p): Only update size from memref if both size and offset known.

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* alias.c (nonoverlapping_memrefs_p): Only update size from memref
	if both size and offset known.

From-SVN: r46956
This commit is contained in:
Richard Kenner 2001-11-12 16:56:48 +00:00 committed by Richard Kenner
parent 834a28c7a8
commit 0af5bc3eae
2 changed files with 12 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Nov 12 11:58:26 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* alias.c (nonoverlapping_memrefs_p): Only update size from memref
if both size and offset known.
2001-11-12 David O'Brien <obrien@FreeBSD.org>
* config/ia64/freebsd.h: Fix misspelling.

11
gcc/alias.c
View File

@ -1817,16 +1817,19 @@ nonoverlapping_memrefs_p (x, y)
: MEM_SIZE (rtly) ? INTVAL (MEM_SIZE (rtly)) :
-1);
/* If we have an offset or size for either memref, it can update the values
computed above. */
/* If we have an offset for either memref, it can update the values computed
above. */
if (MEM_OFFSET (x))
offsetx += INTVAL (MEM_OFFSET (x)), sizex -= INTVAL (MEM_OFFSET (x));
if (MEM_OFFSET (y))
offsety += INTVAL (MEM_OFFSET (y)), sizey -= INTVAL (MEM_OFFSET (y));
if (MEM_SIZE (x))
/* If a memref has both a size and an offset, we can use the smaller size.
We can't do this is the offset isn't know because we must view this
memref as being anywhere inside the DECL's MEM. */
if (MEM_SIZE (x) && MEM_OFFSET (x))
sizex = INTVAL (MEM_SIZE (x));
if (MEM_SIZE (y))
if (MEM_SIZE (y) && MEM_OFFSET (y))
sizey = INTVAL (MEM_SIZE (y));
/* Put the values of the memref with the lower offset in X's values. */