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| 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 | |
| parent | 8ce6fb5fec60f0ce6363d2a41f30e5fc620a4beb (diff) | |
| download | gcc-ea8a6038b0b86ccc037d80a9b600e51b1558ad14.zip gcc-ea8a6038b0b86ccc037d80a9b600e51b1558ad14.tar.gz gcc-ea8a6038b0b86ccc037d80a9b600e51b1558ad14.tar.bz2 | |
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
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/match.pd | 8 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr87954.c | 21 |
4 files changed, 39 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 84c01ce..e6dd35a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +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 Richard Biener <rguenther@suse.de> * vr-values.c (vr_values::extract_range_from_ssa_name): Do not diff --git a/gcc/match.pd b/gcc/match.pd index 02e0471..88dae42 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 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 8213e33..4bc2c29 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2019-06-06 Martin Liska <mliska@suse.cz> + + PR tree-optimization/87954 + * gcc.dg/pr87954.c: New test. + 2019-06-06 Richard Biener <rguenther@suse.de> * gcc.dg/tree-ssa/alias-37.c: New testcase. diff --git a/gcc/testsuite/gcc.dg/pr87954.c b/gcc/testsuite/gcc.dg/pr87954.c new file mode 100644 index 0000000..620657c --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr87954.c @@ -0,0 +1,21 @@ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define __GFP_DMA 1u +#define __GFP_RECLAIM 0x10u + +#define KMALLOC_DMA 2 +#define KMALLOC_RECLAIM 1 + +unsigned int +imul(unsigned int flags) +{ + int is_dma, type_dma, is_rec; + + is_dma = !!(flags & __GFP_DMA); + type_dma = is_dma * KMALLOC_DMA; + is_rec = !!(flags & __GFP_RECLAIM); + + return type_dma + (is_rec * !is_dma) * KMALLOC_RECLAIM; +} + +/* { dg-final { scan-tree-dump-times { \* } 1 "optimized" } } */ |