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| author | Richard Biener <rguenther@suse.de> | 2015-12-04 08:17:50 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2015-12-04 08:17:50 +0000 |
| commit | 5505978ab31300aa02f321f97af9512916ed8595 (patch) | |
| tree | 3ffe8c61c894fb1073c02b9a27437ef8c9a5ea2f | |
| parent | 7fe996ba15e8453ea966bd0a62861e012d7045b6 (diff) | |
| download | gcc-5505978ab31300aa02f321f97af9512916ed8595.zip gcc-5505978ab31300aa02f321f97af9512916ed8595.tar.gz gcc-5505978ab31300aa02f321f97af9512916ed8595.tar.bz2 | |
re PR rtl-optimization/68636 (unnecessary unaligned load on mips o32)
2015-12-04 Richard Biener <rguenther@suse.de>
PR middle-end/68636
* builtins.c (get_pointer_alignment_1): Take care of byte to
bit alignment computation overflow.
From-SVN: r231246
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/builtins.c | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0a3fd79..fc026c5 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2015-12-04 Richard Biener <rguenther@suse.de> + PR middle-end/68636 + * builtins.c (get_pointer_alignment_1): Take care of byte to + bit alignment computation overflow. + +2015-12-04 Richard Biener <rguenther@suse.de> + PR middle-end/67438 * match.pd: Guard ~X cmp ~Y -> Y cmp X and the variant with a constant with single_use. diff --git a/gcc/builtins.c b/gcc/builtins.c index 7c614e6..9d81604 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -458,6 +458,10 @@ get_pointer_alignment_1 (tree exp, unsigned int *alignp, { *bitposp = ptr_misalign * BITS_PER_UNIT; *alignp = ptr_align * BITS_PER_UNIT; + /* Make sure to return a sensible alignment when the multiplication + by BITS_PER_UNIT overflowed. */ + if (*alignp == 0) + *alignp = 1u << (HOST_BITS_PER_INT - 1); /* We cannot really tell whether this result is an approximation. */ return true; } |