avoid-store-forwarding: Fix reg init on load-elimination [PR119160]

In the case that we are eliminating the load instruction, we use zero_extend
for the initialization of the base register for the zero-offset store.
This causes issues when the store and the load use the same mode,
as we are trying to generate a zero_extend with the same inner and
outer modes.

This patch fixes the issue by zero-extending the value stored in the
base register only when the load's mode is wider than the store's mode.

	PR rtl-optimization/119160

gcc/ChangeLog:

	* avoid-store-forwarding.cc (process_store_forwarding):
	Zero-extend the value stored in the base register, in case
	of load-elimination, only when the mode of the destination
	is wider.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr119160.c: New test.

0 files changed, 0 insertions, 0 deletions