https://gcc.gnu.org/g:0d625dc1bffd885b04eb90ff48a6d34acacc3e0b
commit r13-8676-g0d625dc1bffd885b04eb90ff48a6d34acacc3e0b Author: Richard Biener <rguent...@suse.de> Date: Wed Apr 10 10:33:40 2024 +0200 tree-optimization/114672 - WIDEN_MULT_PLUS_EXPR type mismatch 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. 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. (cherry picked from commit 912753cc5f18d786e334dd425469fa7f93155661) Diff: --- gcc/testsuite/gcc.dg/torture/pr114672.c | 14 ++++++++++++++ gcc/tree-ssa-math-opts.cc | 5 +++-- 2 files changed, 17 insertions(+), 2 deletions(-) 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 ff949e4fec9..08cf33214ad 100644 --- a/gcc/tree-ssa-math-opts.cc +++ b/gcc/tree-ssa-math-opts.cc @@ -2875,8 +2875,9 @@ 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)