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| author | Aldy Hernandez <aldyh@redhat.com> | 2023-06-30 20:40:02 +0200 |
|---|---|---|
| committer | Aldy Hernandez <aldyh@redhat.com> | 2023-07-12 23:15:52 +0200 |
| commit | 137fb7077f7711e2e09ee8f82650fe7d93de6a4d (patch) | |
| tree | 85af5ab5b7f4640fb197181215ed31351d07861c /gcc | |
| parent | d6384ad1a9ab7ea46990a7ed1299d5a2be4acece (diff) | |
| download | gcc-137fb7077f7711e2e09ee8f82650fe7d93de6a4d.zip gcc-137fb7077f7711e2e09ee8f82650fe7d93de6a4d.tar.gz gcc-137fb7077f7711e2e09ee8f82650fe7d93de6a4d.tar.bz2 | |
[range-op] Take known set bits into account in popcount [PR107053]
This patch teaches popcount about known set bits which are now
available in the irange.
PR tree-optimization/107053
gcc/ChangeLog:
* gimple-range-op.cc (cfn_popcount): Use known set bits.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/pr107053.c: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gimple-range-op.cc | 11 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr107053.c | 13 |
2 files changed, 20 insertions, 4 deletions
diff --git a/gcc/gimple-range-op.cc b/gcc/gimple-range-op.cc index 72c7b86..67b3c3d 100644 --- a/gcc/gimple-range-op.cc +++ b/gcc/gimple-range-op.cc @@ -880,17 +880,20 @@ public: if (lh.undefined_p ()) return false; unsigned prec = TYPE_PRECISION (type); - wide_int nz = lh.get_nonzero_bits (); - wide_int pop = wi::shwi (wi::popcount (nz), prec); + irange_bitmask bm = lh.get_bitmask (); + wide_int nz = bm.get_nonzero_bits (); + wide_int high = wi::shwi (wi::popcount (nz), prec); // Calculating the popcount of a singleton is trivial. if (lh.singleton_p ()) { - r.set (type, pop, pop); + r.set (type, high, high); return true; } if (cfn_ffs::fold_range (r, type, lh, rh, rel)) { - int_range<2> tmp (type, wi::zero (prec), pop); + wide_int known_ones = ~bm.mask () & bm.value (); + wide_int low = wi::shwi (wi::popcount (known_ones), prec); + int_range<2> tmp (type, low, high); r.intersect (tmp); return true; } diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr107053.c b/gcc/testsuite/gcc.dg/tree-ssa/pr107053.c new file mode 100644 index 0000000..8195d0f --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr107053.c @@ -0,0 +1,13 @@ +// { dg-do compile } +// { dg-options "-O2 -fdump-tree-evrp" } + +void link_failure(); +void f(int a) +{ + a |= 0x300; + int b = __builtin_popcount(a); + if (b < 2) + link_failure(); +} + +// { dg-final { scan-tree-dump-not "link_failure" "evrp" } } |