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| author | Aldy Hernandez <aldyh@redhat.com> | 2022-10-04 17:05:10 +0200 |
|---|---|---|
| committer | Aldy Hernandez <aldyh@redhat.com> | 2022-10-05 14:21:04 +0200 |
| commit | 4c451631f722c9939260a5c2fc209802a47e525f (patch) | |
| tree | 16bc0c6ca427cbc8463f93f092c6d848aff557ac /gcc | |
| parent | ae56d600d223e996054483d7d7033ec8e258d39d (diff) | |
| download | gcc-4c451631f722c9939260a5c2fc209802a47e525f.zip gcc-4c451631f722c9939260a5c2fc209802a47e525f.tar.gz gcc-4c451631f722c9939260a5c2fc209802a47e525f.tar.bz2 | |
[PR tree-optimization/107052] range-ops: Take into account nonzero mask in popcount.
PR tree-optimization/107052
gcc/ChangeLog:
* gimple-range-op.cc (cfn_popcount::fold_range): Take into account
nonzero bit mask.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gimple-range-op.cc | 15 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr107052.c | 13 |
2 files changed, 25 insertions, 3 deletions
diff --git a/gcc/gimple-range-op.cc b/gcc/gimple-range-op.cc index 5b71d1c..42ebc7d 100644 --- a/gcc/gimple-range-op.cc +++ b/gcc/gimple-range-op.cc @@ -422,15 +422,24 @@ public: virtual bool fold_range (irange &r, tree type, const irange &lh, const irange &rh, relation_kind rel) const { + 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); // Calculating the popcount of a singleton is trivial. if (lh.singleton_p ()) { - wide_int nz = lh.get_nonzero_bits (); - wide_int pop = wi::shwi (wi::popcount (nz), TYPE_PRECISION (type)); r.set (type, pop, pop); return true; } - return cfn_ffs::fold_range (r, type, lh, rh, rel); + if (cfn_ffs::fold_range (r, type, lh, rh, rel)) + { + int_range<2> tmp (type, wi::zero (prec), pop); + r.intersect (tmp); + return true; + } + return false; } } op_cfn_popcount; diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr107052.c b/gcc/testsuite/gcc.dg/tree-ssa/pr107052.c new file mode 100644 index 0000000..88b5213 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr107052.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 > 3) + link_failure(); +} + +// { dg-final { scan-tree-dump-not "link_failure" "evrp" } } |