When internal_get_tmp_var fails to gimplify the value the temporary SSA name is supposed to be initialized with we can leak SSA names with a NULL SSA_NAME_DEF_STMT into the IL. That's bad, so recover from this by instead returning a decl in that case.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed. PR middle-end/114299 * gimplify.cc (internal_get_tmp_var): When gimplification of VAL failed, return a decl. * gcc.target/i386/pr114299.c: New testcase. --- gcc/gimplify.cc | 5 +++++ gcc/testsuite/gcc.target/i386/pr114299.c | 14 ++++++++++++++ 2 files changed, 19 insertions(+) create mode 100644 gcc/testsuite/gcc.target/i386/pr114299.c diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc index 81f06ad91bd..f6078386cdf 100644 --- a/gcc/gimplify.cc +++ b/gcc/gimplify.cc @@ -656,6 +656,11 @@ internal_get_tmp_var (tree val, gimple_seq *pre_p, gimple_seq *post_p, gimplify_and_add (mod, pre_p); ggc_free (mod); + /* If we failed to gimplify VAL then we can end up with the temporary + SSA name not having a definition. In this case return a decl. */ + if (TREE_CODE (t) == SSA_NAME && ! SSA_NAME_DEF_STMT (t)) + return lookup_tmp_var (val, is_formal, not_gimple_reg); + return t; } diff --git a/gcc/testsuite/gcc.target/i386/pr114299.c b/gcc/testsuite/gcc.target/i386/pr114299.c new file mode 100644 index 00000000000..b4f30b7a95f --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr114299.c @@ -0,0 +1,14 @@ +/* { dg-do compile { target lp64 } } */ +/* { dg-options "-mgeneral-regs-only" } */ + +typedef __attribute__((__vector_size__(8))) __bf16 V; +typedef __attribute__((__vector_size__(16))) __bf16 W; + +V v; +_Atomic V a; + +W +foo(void) /* { dg-error "SSE" } */ +{ + return __builtin_shufflevector(v, a, 1, 2, 5, 0, 1, 6, 6, 4); /* { dg-error "invalid" } */ +} -- 2.35.3