r181818 - in /trunk/gcc: ChangeLog testsuite/Ch...

[jakub@gcc.gnu.org]

Author: jakub
Date: Tue Nov 29 21:03:09 2011
New Revision: 181818

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181818
Log:
	PR tree-optimization/51247
	* tree-vrp.c (extract_range_from_assert): For signed 1-bit precision
	types instead of adding 1 subtract -1 and instead of subtracting 1
	add -1 to avoid overflows.

	* gcc.c-torture/compile/pr51247.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr51247.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c