On 9/16/2021 3:02 AM, Eric Botcazou wrote:
Hi,
this is a duplication of volatile loads introduced during GCC 9 development by
the new 2->2 mechanism of the RTL combiner. There is already a substantial
checking for volatile references in can_combine_p but it implicitly assumes
that the combination reduces the number of instructions, which is of course
not the case here. So the fix teaches try_combine to abort the combination
when it is about to make a copy of volatile references to preserve them.
Bootstrapped/regtested on x86-64/Linux, OK for mainline and release branches?
2021-09-16 Eric Botcazou <ebotca...@adacore.com>
PR rtl-optimization/102306
* combine.c (try_combine): Abort the combination if we are about
to duplicate volatile references.
2021-09-16 Eric Botcazou <ebotca...@adacore.com>
* gcc.target/sparc/20210916-1.c: New test.
OK
jeff
