From: Pan Li <pan2...@intel.com>
This patch would like to fix one ICE when try to match the binary
phi for below cfg. We check the first edge of the Phi block comes
from b0, instead of check the only one edge of b1 comes from the
b0 too. Thus, it will result in some code to be recog as .SAT_SUB
but it is not, and finally result the verify_ssa failure.
+------+
| b0: |
| def | +-----+
| ... | | b1: |
| cond |------>| def |
+------+ | ... |
| +-----+
| |
| |
v |
+-----+ |
| b2: | |
| Phi |<----------+
+-----+
The below test suites are passed for this patch.
* The rv64gcv fully regression test.
* The x86 bootstrap test.
* The x86 fully regression test.
PR target/116795
gcc/ChangeLog:
* gimple-match-head.cc (match_cond_with_binary_phi): Fix the
incorrect cfg check as b0->b1 in above example.
gcc/testsuite/ChangeLog:
* gcc.dg/torture/pr116795-1.c: New test.
Signed-off-by: Pan Li <pan2...@intel.com>
---
gcc/gimple-match-head.cc | 2 +-
gcc/testsuite/gcc.dg/torture/pr116795-1.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr116795-1.c
diff --git a/gcc/gimple-match-head.cc b/gcc/gimple-match-head.cc
index b63b66e9485..b5d4a71ddc5 100644
--- a/gcc/gimple-match-head.cc
+++ b/gcc/gimple-match-head.cc
@@ -402,7 +402,7 @@ match_cond_with_binary_phi (gphi *phi, tree *true_arg, tree
*false_arg)
if (EDGE_COUNT (pred_b0->succs) == 2
&& EDGE_COUNT (pred_b1->succs) == 1
&& EDGE_COUNT (pred_b1->preds) == 1
- && pred_b0 == EDGE_PRED (gimple_bb (phi), 0)->src)
+ && pred_b0 == EDGE_PRED (pred_b1, 0)->src)
/*
* +------+
* | b0: |
diff --git a/gcc/testsuite/gcc.dg/torture/pr116795-1.c
b/gcc/testsuite/gcc.dg/torture/pr116795-1.c
new file mode 100644
index 00000000000..629bdf4bacd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr116795-1.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+volatile int a, b;
+int c;
+int main() {
+ unsigned e = 0;
+ for (; e < 2; e++) {
+ a && b;
+ if (c)
+ e = -(c ^ e);
+ }
+ return 0;
+}
--
2.43.0
