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| author | Alexandre Oliva <aoliva@redhat.com> | 2008-12-12 04:56:29 +0000 |
|---|---|---|
| committer | Alexandre Oliva <aoliva@gcc.gnu.org> | 2008-12-12 04:56:29 +0000 |
| commit | 26e4f1baa2647df48d9aaf58c21e159cb7f2a66b (patch) | |
| tree | 1ffb7ffff10a699fb7a8e87e1fd7bf924380fd57 | |
| parent | db231d5d4d05d7ec1a203ea65b81331bdda99493 (diff) | |
| download | gcc-26e4f1baa2647df48d9aaf58c21e159cb7f2a66b.zip gcc-26e4f1baa2647df48d9aaf58c21e159cb7f2a66b.tar.gz gcc-26e4f1baa2647df48d9aaf58c21e159cb7f2a66b.tar.bz2 | |
tree-vrp.c (extract_range_from_binary_expr): Don't shift by floor_log2 of zero.
* tree-vrp.c (extract_range_from_binary_expr): Don't shift by
floor_log2 of zero. Negate widened zero.
From-SVN: r142702
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 4 |
2 files changed, 7 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2736005..6c9a378 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2008-12-12 Alexandre Oliva <aoliva@redhat.com> + + * tree-vrp.c (extract_range_from_binary_expr): Don't shift by + floor_log2 of zero. Negate widened zero. + 2008-12-12 Ben Elliston <bje@au.ibm.com> * config/fp-bit.c (nan): Rename from this .. diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index a69b216..9d23b24 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -2557,11 +2557,11 @@ extract_range_from_binary_expr (value_range_t *vr, ior_max.high = vr0_max.high | vr1_max.high; if (ior_max.high != 0) { - ior_max.low = ~0u; + ior_max.low = ~(unsigned HOST_WIDE_INT)0u; ior_max.high |= ((HOST_WIDE_INT) 1 << floor_log2 (ior_max.high)) - 1; } - else + else if (ior_max.low != 0) ior_max.low |= ((unsigned HOST_WIDE_INT) 1u << floor_log2 (ior_max.low)) - 1; |