r253734 - in /trunk: gcc/ChangeLog gcc/internal...

[jakub@gcc.gnu.org]

Author: jakub
Date: Fri Oct 13 17:19:12 2017
New Revision: 253734

URL: https://gcc.gnu.org/viewcvs?rev=253734&root=gcc&view=rev
Log:
	PR target/82274
	* internal-fn.c (expand_mul_overflow): If both operands have
	the same highpart of -1 or 0 and the topmost bit of lowpart
	is different, overflow is if res <= 0 rather than res < 0.

	* libgcc2.c (__mulvDI3): If both operands have
	the same highpart of -1 and the topmost bit of lowpart is 0,
	multiplication overflows even if both lowparts are 0.

	* gcc.dg/pr82274-1.c: New test.
	* gcc.dg/pr82274-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr82274-1.c
    trunk/gcc/testsuite/gcc.dg/pr82274-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/internal-fn.c
    trunk/gcc/testsuite/ChangeLog
    trunk/libgcc/ChangeLog
    trunk/libgcc/libgcc2.c