On 12/7/2021 10:37 PM, Alexandre Oliva via Gcc-patches wrote:
If we emit clobbers before multi-word moves during lra, we get
confused if a copy ends up with input or output replaced with each
other: the clobber then kills the previous set, and it gets deleted.
This patch avoids emitting such clobbers when lra_in_progress.
Regstrapped on x86_64-linux-gnu. Verified that, applied on a riscv64
compiler that failed the test, the asm statements are no longer dropped
in the reload dumps. Running a x86_64-x-riscv64 regression testing now.
Ok to install?
for gcc/ChangeLog
PR target/103302
expr.c (emit_move_multi_word): Skip clobber during lra.
for gcc/testsuite/ChangeLog
PR target/103302
* gcc.target/riscv/pr103302.c: New.
OK. Nit in the ChangeLog. You forgot a '*' before the expr.c entry.
jeff
