[PATCH 4/4][AArch64] Cost CCMP instruction sequences to choose better expand order

[H.J. Lu]

On Tue, Dec 15, 2015 at 2:33 AM, Wilco Dijkstra <Wilco.Dijkstra@arm.com> wrote:
> ping
>
>> -----Original Message-----
>> From: Wilco Dijkstra [mailto:Wilco.Dijkstra@arm.com]
>> Sent: 13 November 2015 16:03
>> To: 'gcc-patches@gcc.gnu.org'
>> Subject: [PATCH 4/4][AArch64] Cost CCMP instruction sequences to choose better expand order
>>
>> This patch adds CCMP selection based on rtx costs. This is based on Jiong's already approved patch https://gcc.gnu.org/ml/gcc-
>> patches/2015-09/msg01434.html with some minor refactoring and the tests updated.
>>
>> OK for commit?
>>
>> ChangeLog:
>> 2015-11-13  Jiong Wang  <jiong.wang@arm.com>
>>
>> gcc/
>>       * ccmp.c (expand_ccmp_expr_1): Cost the instruction sequences
>>       generated from different expand order.
>>

It breaks bootstrap on Linux/x86:

https://gcc.gnu.org/ml/gcc-regression/2016-01/msg00332.html

-- ../../src-trunk/gcc/ccmp.c: In function ârtx_def*
expand_ccmp_expr_1(gimple*, rtx_def**, rtx_def**)â:
../../src-trunk/gcc/ccmp.c:173:14: error: âretâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
    rtx tmp2, ret, ret2;
              ^~~

cc1plus: all warnings being treated as errors
Makefile:1085: recipe for target 'ccmp.o' failed
make[6]: *** [ccmp.o] Error 1

H.J.