From dc2dfdb6b7111997a3dd80146b0256810a532b0b Mon Sep 17 00:00:00 2001 From: kenner 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. */ -- cgit v1.2.1