[PATCH PR93334][GCC11]Refine data dependence of two refs storing the same constant with the same bytes

Wed, 29 Jan 2020 05:52:59 -0800 

Hi,

As discussed in the PR, this simple patch refines data dependence of two write
references storing the same constant with the same bytes.  It simply detects
the case with some restrictions and treats it as no dependence.  For now the
added interface in tree-data-ref.c is only used in loop distribution, which 
might
be generalized in the future.

Bootstrap and test on x86_64.  Any comments?

Thanks,
bin

2020-01-29  Bin Cheng  <bin.ch...@linux.alibaba.com>

        * tree-data-ref.c (refine_affine_dependence): New function.
        * tree-data-ref.h (refine_affine_dependence): New declaration.
        * tree.h (const_with_all_bytes_same): External declaration.
        * tree.c (const_with_all_bytes_same): Moved from...
        * tree-loop-distribution.c (const_with_all_bytes_same): ...here.  Call
        refine_affine_dependence

gcc/testsuite
2020-01-29  Bin Cheng  <bin.ch...@linux.alibaba.com>

        * gcc/testsuite/gcc.dg/tree-ssa/pr93334.c: New test.

Attachment: 0001-pr93334.patch
Description: Binary data

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