tree-optimization/110766 - missing PHI location check
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Commit Message
The following adds a missing PHI location check before querying
the loop latch PHI arg from it.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/110766
* tree-scalar-evolution.cc
(analyze_and_compute_bitwise_induction_effect): Check the PHI
is defined in the loop header.
* gcc.dg/torture/pr110766.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr110766.c | 17 +++++++++++++++++
gcc/tree-scalar-evolution.cc | 1 +
2 files changed, 18 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr110766.c
new file mode 100644
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+
+int a, b, c, e;
+short d, f;
+int g(int h) { return h > a ? h : h << a; }
+int main() {
+ while (e) {
+ b = 0;
+ for (; b < 3; b++)
+ if (c) {
+ e = g(1);
+ f = e | d;
+ }
+ d = 0;
+ }
+ return 0;
+}
@@ -3519,6 +3519,7 @@ analyze_and_compute_bitwise_induction_effect (class loop* loop,
if (!gimple_bitwise_induction_p (phidef, &match_op[0], NULL)
|| TREE_CODE (match_op[2]) != SSA_NAME
|| !(header_phi = dyn_cast <gphi *> (SSA_NAME_DEF_STMT (match_op[2])))
+ || gimple_bb (header_phi) != loop->header
|| gimple_phi_num_args (header_phi) != 2)
return NULL_TREE;