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| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-09-01 11:36:04 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-09-01 11:36:04 +0000 |
| commit | 72695711bad6c10cefb554d603dc55e7666c553c (patch) | |
| tree | c3619bd02368436546f1ce8ec609f781de991f48 /libgfortran/runtime | |
| parent | a41ed05a442de10d4cd793791fecb37cc3203ad8 (diff) | |
| download | ppe42-gcc-72695711bad6c10cefb554d603dc55e7666c553c.tar.gz ppe42-gcc-72695711bad6c10cefb554d603dc55e7666c553c.zip | |
Backported from mainline
2014-08-04 Jakub Jelinek <jakub@redhat.com>
* runtime/memory.c (xmallocarray): Avoid division for the common case.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@214788 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgfortran/runtime')
| -rw-r--r-- | libgfortran/runtime/memory.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libgfortran/runtime/memory.c b/libgfortran/runtime/memory.c index c1e735894a5..d3b77de4b87 100644 --- a/libgfortran/runtime/memory.c +++ b/libgfortran/runtime/memory.c @@ -56,7 +56,9 @@ xmallocarray (size_t nmemb, size_t size) if (!nmemb || !size) size = nmemb = 1; - else if (nmemb > SIZE_MAX / size) +#define HALF_SIZE_T (((size_t) 1) << (__CHAR_BIT__ * sizeof (size_t) / 2)) + else if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0) + && nmemb > SIZE_MAX / size) { errno = ENOMEM; os_error ("Integer overflow in xmallocarray"); |
