diff options
| author | Martin Liska <mliska@suse.cz> | 2019-06-06 09:55:51 +0200 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2019-06-06 07:55:51 +0000 |
| commit | ea8a6038b0b86ccc037d80a9b600e51b1558ad14 (patch) | |
| tree | 0df38b73b39e84424d2945135bc584dc7b237e41 /gcc/match.pd | |
| parent | 8ce6fb5fec60f0ce6363d2a41f30e5fc620a4beb (diff) | |
Simplify mult where both arguments are 0 or 1 (PR tree-optimization/87954).
2019-06-06 Martin Liska <mliska@suse.cz>
PR tree-optimization/87954
* match.pd: Simplify mult where both arguments are 0 or 1.
2019-06-06 Martin Liska <mliska@suse.cz>
PR tree-optimization/87954
* gcc.dg/pr87954.c: New test.
From-SVN: r271991
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 02e0471dd4e..88dae4231d8 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -217,6 +217,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) || !COMPLEX_FLOAT_TYPE_P (type))) (negate @0))) +/* Transform { 0 or 1 } * { 0 or 1 } into { 0 or 1 } & { 0 or 1 } */ +(simplify + (mult SSA_NAME@1 SSA_NAME@2) + (if (INTEGRAL_TYPE_P (type) + && get_nonzero_bits (@1) == 1 + && get_nonzero_bits (@2) == 1) + (bit_and @1 @2))) + /* Transform x * { 0 or 1, 0 or 1, ... } into x & { 0 or -1, 0 or -1, ...}, unless the target has native support for the former but not the latter. */ (simplify |