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| author | Jakub Jelinek <jakub@redhat.com> | 2017-11-13 11:26:13 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2017-11-13 11:26:13 +0100 |
| commit | a6fbd15424044457d5c283e5fd2d0d1bb0dcfbb6 (patch) | |
| tree | c4644b84d36195da7ac02fcc2c2a4ac621c3a29f /gcc/tree-ssa-sink.c | |
| parent | a1b5dd18ae7e335058f2f096b54a251b19eb9d2d (diff) | |
| download | gcc-a6fbd15424044457d5c283e5fd2d0d1bb0dcfbb6.zip gcc-a6fbd15424044457d5c283e5fd2d0d1bb0dcfbb6.tar.gz gcc-a6fbd15424044457d5c283e5fd2d0d1bb0dcfbb6.tar.bz2 | |
re PR tree-optimization/78821 (GCC7: Copying whole 32 bits structure field by field not optimised into copying whole 32 bits at once)
PR tree-optimization/78821
* gimple-ssa-store-merging.c (compatible_load_p): Don't require
that bit_not_p is the same.
(imm_store_chain_info::coalesce_immediate_stores): Likewise.
(split_group): Count precisely bit_not_p bits in each statement.
(invert_op): New function.
(imm_store_chain_info::output_merged_store): Use invert_op to
emit BIT_XOR_EXPR with a xor_mask instead of BIT_NOT_EXPR if some
but not all orig_stores have BIT_NOT_EXPR in the corresponding spots.
* gcc.dg/store_merging_15.c: New test.
From-SVN: r254679
Diffstat (limited to 'gcc/tree-ssa-sink.c')
0 files changed, 0 insertions, 0 deletions