The following makes sure to restrict WIDEN_MULT*_EXPR to a mode
precision final compute type as the mode is used to find the optab
and type checking chokes when seeing bit-precisions later which
would likely also not properly expanded to RTL.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/114672
* tree-ssa-math-opts.cc (convert_plusminus_to_widen): Only
allow mode-precision results.
* gcc.dg/torture/pr114672.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr114672.c | 14 ++++++++++++++
gcc/tree-ssa-math-opts.cc | 5 +++--
2 files changed, 17 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr114672.c
diff --git a/gcc/testsuite/gcc.dg/torture/pr114672.c
b/gcc/testsuite/gcc.dg/torture/pr114672.c
new file mode 100644
index 00000000000..b69511fe8db
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr114672.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+
+struct {
+ __INT64_TYPE__ m : 60;
+} s;
+
+short a;
+short b;
+
+void
+foo ()
+{
+ s.m += a * b;
+}
diff --git a/gcc/tree-ssa-math-opts.cc b/gcc/tree-ssa-math-opts.cc
index a8d25c2de48..705f4a4695a 100644
--- a/gcc/tree-ssa-math-opts.cc
+++ b/gcc/tree-ssa-math-opts.cc
@@ -2918,8 +2918,9 @@ convert_plusminus_to_widen (gimple_stmt_iterator *gsi,
gimple *stmt,
lhs = gimple_assign_lhs (stmt);
type = TREE_TYPE (lhs);
- if (TREE_CODE (type) != INTEGER_TYPE
- && TREE_CODE (type) != FIXED_POINT_TYPE)
+ if ((TREE_CODE (type) != INTEGER_TYPE
+ && TREE_CODE (type) != FIXED_POINT_TYPE)
+ || !type_has_mode_precision_p (type))
return false;
if (code == MINUS_EXPR)
--
2.35.3
