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-rw-r--r--gcc/testsuite/gcc.c-torture/compile/pr110271.c24
-rw-r--r--gcc/tree-ssa-math-opts.cc9
2 files changed, 30 insertions, 3 deletions
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr110271.c b/gcc/testsuite/gcc.c-torture/compile/pr110271.c
new file mode 100644
index 0000000..0cb91be
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr110271.c
@@ -0,0 +1,24 @@
+/* PR tree-optimization/110271 */
+
+unsigned a, b, c, d, e;
+
+void
+foo (unsigned *x, int y, unsigned int *z)
+{
+ for (int i = 0; i < y; i++)
+ {
+ b += d;
+ a += b < d;
+ a += c = (__PTRDIFF_TYPE__) x > 3;
+ d = z[1] + (a < c);
+ a += e;
+ d += a < e;
+ }
+}
+
+void
+bar (unsigned int *z)
+{
+ unsigned *x = x;
+ foo (x, 9, z);
+}
diff --git a/gcc/tree-ssa-math-opts.cc b/gcc/tree-ssa-math-opts.cc
index b2764d4..d2b7129 100644
--- a/gcc/tree-ssa-math-opts.cc
+++ b/gcc/tree-ssa-math-opts.cc
@@ -5558,9 +5558,12 @@ math_opts_dom_walker::after_dom_children (basic_block bb)
case PLUS_EXPR:
case MINUS_EXPR:
- if (!convert_plusminus_to_widen (&gsi, stmt, code)
- && !match_arith_overflow (&gsi, stmt, code, m_cfg_changed_p))
- match_uaddc_usubc (&gsi, stmt, code);
+ if (!convert_plusminus_to_widen (&gsi, stmt, code))
+ {
+ match_arith_overflow (&gsi, stmt, code, m_cfg_changed_p);
+ if (gsi_stmt (gsi) == stmt)
+ match_uaddc_usubc (&gsi, stmt, code);
+ }
break;
case BIT_NOT_EXPR: