[PATCH] Fix PR67037: Wrong code at -O1 and above on ARM

[Bernd Edlinger]

Hi,


I noticed, that this wrong code bug is caused by two insns which are created by 
the
function process_addr_reg in lra-constraints.c, which share a common sub 
expression.
The fix is rather simple, use copy_rtx when the memory reference is used twice.

The patch was boot-strapped and regression-tested
on x86_64-pc-linux-gnu and arm-linux-gnueabihf.

OK for trunk?


Thanks
Bernd.
                                          
gcc:
2015-09-30  Bernd Edlinger  <bernd.edlin...@hotmail.de>

        PR rtl-optimization/67037
        * lra-constraints.c (process_addr_reg): Use copy_rtx when necessary.

testsuite:
2015-09-30  Bernd Edlinger  <bernd.edlin...@hotmail.de>

        PR rtl-optimization/67037
        * gcc.c-torture/execute/pr67037.c: New test.

patch-pr67037.diff
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