[committed] Avoid right shifting signed value on ext-dce.ccHEADtrunkmaster

This is analogous to a prior patch to ext-dce which fixes propagation of sign
bits, but this time for the saturating variants.  I'd held off fixing those
because I wanted the time to look at that code (since we don't have a testcase
for it as far as I know).

Not surprisingly, putting an abort on that path and running an x86 bootstrap
and testsuite run, it never triggers.  Of course not a lot of code tries to do
saturating shifts.

Anyway, bootstrapped and regression tested on x86_64.  Pushing to the trunk.

Thanks for everyone's patience.

gcc/
	* ext-dce.cc (carry_backpropagate): Cast mask to HOST_WIDE_INT before
	shifting.

0 files changed, 0 insertions, 0 deletions