Both initial_condition_in_loop_num and evolution_part_in_loop_num
can return NULL. This patch exits if either one is NULL. Presumably
this didn't happen before, because adjust_range_with_scev was called
far less frequently than in ranger, which can call it for every PHI.
OK pending tests?
gcc/ChangeLog:
PR tree-optimization/100349
* vr-values.c (bounds_of_var_in_loop): Bail if scev returns
NULL.
gcc/testsuite/ChangeLog:
* gcc.dg/pr100349.c: New test.
---
gcc/testsuite/gcc.dg/pr100349.c | 16 ++++++++++++++++
gcc/vr-values.c | 3 +++
2 files changed, 19 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/pr100349.c
diff --git a/gcc/testsuite/gcc.dg/pr100349.c b/gcc/testsuite/gcc.dg/pr100349.c
new file mode 100644
index 00000000000..dd7977ac0f9
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr100349.c
@@ -0,0 +1,16 @@
+// { dg-do compile }
+// { dg-options "-O2 -w" }
+
+#include <stdint.h>
+uint8_t a;
+b(int8_t c) {
+ int d;
+e:
+ uint32_t f;
+ for (;;)
+ for (c = 10; c; c++)
+ if (0 > (a = c) ?: d) {
+ f = a;
+ goto e;
+ }
+}
diff --git a/gcc/vr-values.c b/gcc/vr-values.c
index 08b237b2632..b1bf53af9e0 100644
--- a/gcc/vr-values.c
+++ b/gcc/vr-values.c
@@ -1650,6 +1650,9 @@ bounds_of_var_in_loop (tree *min, tree *max, range_query
*query,
init = initial_condition_in_loop_num (chrec, loop->num);
step = evolution_part_in_loop_num (chrec, loop->num);
+ if (!init || !step)
+ return false;
+
/* If INIT is an SSA with a singleton range, set INIT to said
singleton, otherwise leave INIT alone. */
if (TREE_CODE (init) == SSA_NAME)
--
2.31.1
