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| author | Andrew Pinski <apinski@marvell.com> | 2023-06-07 07:58:50 -0700 |
|---|---|---|
| committer | Andrew Pinski <apinski@marvell.com> | 2023-06-09 07:09:15 -0700 |
| commit | 7ceed7e3e29c3375e3b8c4347d1985a72bbe7f11 (patch) | |
| tree | e83fd55d965b5ba5094dbb040b22bc852fb4b724 /gcc | |
| parent | 72e652f3425079259faa4edefe1dc571f72f91e0 (diff) | |
| download | gcc-7ceed7e3e29c3375e3b8c4347d1985a72bbe7f11.zip gcc-7ceed7e3e29c3375e3b8c4347d1985a72bbe7f11.tar.gz gcc-7ceed7e3e29c3375e3b8c4347d1985a72bbe7f11.tar.bz2 | |
MATCH: Allow unsigned types for `X & -Y -> X * Y` pattern
This allows unsigned types if the inner type where the negation is
located has greater than or equal to precision than the outer type.
branchless-cond.c needs to be updated since now we change it to
use a multiply rather than still having (-a)&c in there.
OK? Bootstrapped and tested on x86_64-linux-gnu.
gcc/ChangeLog:
* match.pd (`X & -Y -> X * Y`): Allow for truncation
and the same type for unsigned types.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/branchless-cond.c: Update testcase.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/match.pd | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c | 6 |
2 files changed, 7 insertions, 4 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 335e353..77030b3 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -2065,7 +2065,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (if (INTEGRAL_TYPE_P (type) && INTEGRAL_TYPE_P (TREE_TYPE (@0)) && TREE_CODE (TREE_TYPE (@0)) != BOOLEAN_TYPE - && !TYPE_UNSIGNED (TREE_TYPE (@0))) + /* Sign extending of the neg or a truncation of the neg + is needed. */ + && (!TYPE_UNSIGNED (TREE_TYPE (@0)) + || TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0)))) (mult (convert @0) @1))) /* Narrow integer multiplication by a zero_one_valued_p operand. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c b/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c index 68087ae..e063dc4 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c @@ -21,6 +21,6 @@ int f4(unsigned int x, unsigned int y, unsigned int z) return ((x & 1) != 0) ? z | y : y; } -/* { dg-final { scan-tree-dump-times " -" 4 "optimized" } } */ -/* { dg-final { scan-tree-dump-times " & " 8 "optimized" } } */ -/* { dg-final { scan-tree-dump-not "if" "optimized" } } */ +/* { dg-final { scan-tree-dump-times " \\\*" 4 "optimized" } } */ +/* { dg-final { scan-tree-dump-times " & " 4 "optimized" } } */ +/* { dg-final { scan-tree-dump-not "if " "optimized" } } */ |