[PATCH 4/4] Un-XFAIL ssa-dom-cse-2.c for most platforms

Alan Lawrence alan.lawrence@foss.arm.com
Thu Feb 4 11:53:00 GMT 2016

On 04/02/16 09:53, Dominik Vogt wrote:
> On Wed, Feb 03, 2016 at 11:41:02AM +0000, Alan Lawrence wrote:
>> On 26/01/16 12:23, Dominik Vogt wrote:
>>> On Mon, Dec 21, 2015 at 01:13:28PM +0000, Alan Lawrence wrote:
>>>> ...the test passes with --param sra-max-scalarization-size-Ospeed.
>>>> Verified on aarch64 and with stage1 compiler for hppa, powerpc, sparc, s390.
>>> How did you test this on s390?  For me, the test still fails
>>> unless I add -march=z13 (s390x).
>> Sorry for the slow response, was away last week. On x86 host, I built a compiler
>> configure --enable-languages=c,c++,lto --target=s390-none-linux-gnu
>                                                    ^^^^
> Looks like the test fails only on s390x (64-Bit ) without
> -march=z13 but works on s390 (31-Bit).

Ah, yes, I see. Loop is not unrolled for dom2, then vectorizer kicks in but 
vectorizes only the initialization/loading, and dom can't see the redundancy in

MEM[(int[8] *)&a] = { 0, 1 };
_23 = a[0];

as they aren't reading equivalent chunks of memory.

Same problem as on Alpha, and powerpc64 (without -mcpu=power7/power8).

Powerpc chose to XFAIL rather than add -mcpu=power7, but I'm OK with any 
testsuite workaround here, such as yours.

Cheers, Alan

More information about the Gcc-patches mailing list