On Mon, Nov 12, 2018 at 10:19:04PM +1030, Alan Modra wrote:
> I'd like to remove -many from the options passed by default to the
> assembler, on the grounds that a gcc bug in instruction selection (eg.
> emitting a power9 insn for -mcpu=power8) is better found at assembly
> time than run time.
>
> This might annoy people for a while fixing user asm that we didn't
> diagnose previously, but I believe this is the right direction to go.
> Of course, -Wa,-many is available for anyone who just wants their
> dodgy old code to work.
>
> Bootstrapped etc. powerpc64le-linux. OK?
I forgot to mention something important. This exposes a bug with our
target_clones support, in that we don't emit .machine directives when
changing cpu. eg. gcc.target/powerpc/clone2.c fails with
"unrecognized opcode: `modsd'".
__attribute__((__target__("cpu=..."))) also doesn't emit a .machine
directive before the affected function code.
--
Alan Modra
Australia Development Lab, IBM
