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| author | Richard Biener <rguenther@suse.de> | 2023-09-27 12:48:50 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-09-27 13:45:20 +0200 |
| commit | f7d7e26f10e8e329c3521ae7475ed2dfa38ba677 (patch) | |
| tree | cee5158efbdbb37229c13ab13972d8c23dafafd2 | |
| parent | d326bb6d7588425d013791299272f913fb23e56d (diff) | |
| download | gcc-f7d7e26f10e8e329c3521ae7475ed2dfa38ba677.zip gcc-f7d7e26f10e8e329c3521ae7475ed2dfa38ba677.tar.gz gcc-f7d7e26f10e8e329c3521ae7475ed2dfa38ba677.tar.bz2 | |
Simplify abs (copysign (x, y))
The following adds simplification of abs (copysign (x, y)) to abs (x).
* match.pd (abs (copysign (x, y)) -> abs (x)): New pattern.
* gcc.dg/fold-abs-6.c: New testcase.
| -rw-r--r-- | gcc/match.pd | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/fold-abs-6.c | 9 |
2 files changed, 14 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 1250833..f0be325 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -7445,6 +7445,11 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (COPYSIGN_ALL @0 tree_expr_nonnegative_p@1) (abs @0)) +(simplify + /* fabs (copysign(x, y)) -> fabs (x). */ + (abs (COPYSIGN_ALL @0 @1)) + (abs @0)) + (for scale (LDEXP SCALBN SCALBLN) /* ldexp(0, x) -> 0. */ (simplify diff --git a/gcc/testsuite/gcc.dg/fold-abs-6.c b/gcc/testsuite/gcc.dg/fold-abs-6.c new file mode 100644 index 0000000..42ef923 --- /dev/null +++ b/gcc/testsuite/gcc.dg/fold-abs-6.c @@ -0,0 +1,9 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-original" } */ + +float foo (float x, float y) +{ + return __builtin_fabsf (__builtin_copysignf (x, y)); +} + +/* { dg-final { scan-tree-dump "return ABS_EXPR <x>;" "original" } } */ |