From dc2dfdb6b7111997a3dd80146b0256810a532b0b Mon Sep 17 00:00:00 2001
From: kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 12 Nov 2001 16:56:48 +0000
Subject: * alias.c (nonoverlapping_memrefs_p): Only update size from
memref if both size and offset known.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46956 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/alias.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
(limited to 'gcc/alias.c')
diff --git a/gcc/alias.c b/gcc/alias.c
index 45e82643ad7..7f01c0c7396 100644
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -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. */
--
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