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-rw-r--r--gcc/range-op-float.cc3
-rw-r--r--gcc/testsuite/gcc.dg/ubsan/pr107668.c12
2 files changed, 14 insertions, 1 deletions
diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc
index 53a0928..0c4ec8d 100644
--- a/gcc/range-op-float.cc
+++ b/gcc/range-op-float.cc
@@ -1891,8 +1891,9 @@ float_binary_op_range_finish (bool ret, frange &r, tree type,
// or the reverse operation introduced a known NAN.
// Say for lhs = op1 * op2 if lhs is [-0, +0] and op2 is too,
// 0 / 0 is known NAN. Just punt in that case.
+ // If NANs aren't honored, we get for 0 / 0 UNDEFINED, so punt as well.
// Or if lhs is a known NAN, we also don't know anything.
- if (r.known_isnan () || lhs.known_isnan ())
+ if (r.known_isnan () || lhs.known_isnan () || r.undefined_p ())
{
r.set_varying (type);
return true;
diff --git a/gcc/testsuite/gcc.dg/ubsan/pr107668.c b/gcc/testsuite/gcc.dg/ubsan/pr107668.c
new file mode 100644
index 0000000..e94d6cd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ubsan/pr107668.c
@@ -0,0 +1,12 @@
+/* PR tree-optimization/107668 */
+/* { dg-do compile } */
+/* { dg-options "-ffast-math -fno-associative-math -fsanitize=float-cast-overflow -fno-guess-branch-probability -fsigned-zeros" } */
+
+_Complex int c;
+int i;
+
+void
+foo (void)
+{
+ c /= (_Complex) i;
+}