[gcc r12-5698] middle-end: Skip initialization of opaque type variables [PR103127]

[Peter Bergner]

https://gcc.gnu.org/g:5b1ef8b9db964ec2375df29a73d2b1651afe7ea9

commit r12-5698-g5b1ef8b9db964ec2375df29a73d2b1651afe7ea9
Author: Peter Bergner <bergner@linux.ibm.com>
Date:   Wed Dec 1 13:17:52 2021 -0600

    middle-end: Skip initialization of opaque type variables [PR103127]
    
    For -ftrivial-auto-var-init=*, skip initializing the variable if it is an
    opaque type, because CONST0_RTX(mode) is not defined for opaque modes.
    
    2021-12-01  Peter Bergner  <bergner@linux.ibm.com>
    
    gcc/
            PR middle-end/103127
            * gimplify.c (is_var_need_auto_init): Handle opaque types.
    
    gcc/testsuite/
            PR middle-end/103127
            * gcc.target/powerpc/pr103127.c: New test.

Diff:
---
 gcc/gimplify.c                              |  1 +
 gcc/testsuite/gcc.target/powerpc/pr103127.c | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 8624f8221fd..326476f0238 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -1829,6 +1829,7 @@ is_var_need_auto_init (tree decl)
 	  || !DECL_HARD_REGISTER (decl))
       && (flag_auto_var_init > AUTO_INIT_UNINITIALIZED)
       && (!lookup_attribute ("uninitialized", DECL_ATTRIBUTES (decl)))
+      && !OPAQUE_TYPE_P (TREE_TYPE (decl))
       && !is_empty_type (TREE_TYPE (decl)))
     return true;
   return false;
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103127.c b/gcc/testsuite/gcc.target/powerpc/pr103127.c
new file mode 100644
index 00000000000..801fc0a4620
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103127.c
@@ -0,0 +1,19 @@
+/* PR target/103127 */
+/* { dg-require-effective-target power10_ok } */
+/* { dg-options "-O2 -mdejagnu-cpu=power10 -ftrivial-auto-var-init=zero" } */
+
+/* Verify we do not ICE on the following tests.  */
+
+void
+foo (__vector_quad *dst)
+{
+  __vector_quad acc;
+  *dst = acc;
+}
+
+void
+bar (__vector_pair *dst)
+{
+  __vector_pair pair;
+  *dst = pair;
+}