diff options
| author | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 2001-11-12 16:56:48 +0000 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 2001-11-12 11:56:48 -0500 |
| commit | 0af5bc3eae6d6cc0bd0e40c5d770f0f4cd083b47 (patch) | |
| tree | 1fa2e5dfd7a4057fe7848ae8d3cb6995e75158b1 /gcc/alias.c | |
| parent | 834a28c7a8dae51fa89e95bbfe5b0bfa62806401 (diff) | |
| download | gcc-0af5bc3eae6d6cc0bd0e40c5d770f0f4cd083b47.zip gcc-0af5bc3eae6d6cc0bd0e40c5d770f0f4cd083b47.tar.gz gcc-0af5bc3eae6d6cc0bd0e40c5d770f0f4cd083b47.tar.bz2 | |
alias.c (nonoverlapping_memrefs_p): Only update size from memref if both size and offset known.
* alias.c (nonoverlapping_memrefs_p): Only update size from memref
if both size and offset known.
From-SVN: r46956
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index 45e8264..7f01c0c 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. */ |