[gcc r17-3156] OpenMP: Use VOID_TYPE_P to check for void return type in SIMD function clones.

https://gcc.gnu.org/g:e212f5ef86f1a87c4471f8076a2cc6843ad10a20

commit r17-3156-ge212f5ef86f1a87c4471f8076a2cc6843ad10a20
Author: Kevin Stefanov <[email protected]>
Date:   Sat Aug 8 13:41:14 2026 +0300

    OpenMP: Use VOID_TYPE_P to check for void return type in SIMD function clones.
    
    This change fixes an issue where functions
    decorated with:
    pragma omp declare simd
    that return void via a typedef would crash
    GCC with an ICE while compiling a program
    containing such a function, by using
    VOID_TYPE_P instead of directly comparing
    to void_type_node. New testcase added.
    
            PR middle-end/111856
    
    gcc/ChangeLog:
    
            * omp-simd-clone.cc (simd_clone_adjust_return_type): Use VOID_TYPE_P
            when checking for void return type in adjusted functions.
            (simd_clone_adjust): Likewise.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/gomp/pr111856.c: New test.
    
    Signed-off-by: Kevin Stefanov <[email protected]>

Diff:
---
 gcc/omp-simd-clone.cc                |  4 ++--
 gcc/testsuite/gcc.dg/gomp/pr111856.c | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/gcc/omp-simd-clone.cc b/gcc/omp-simd-clone.cc
index 7564846fac4c..4f189f243a0d 100644
--- a/gcc/omp-simd-clone.cc
+++ b/gcc/omp-simd-clone.cc
@@ -715,7 +715,7 @@ simd_clone_adjust_return_type (struct cgraph_node *node)
   tree t;
 
   /* Adjust the function return type.  */
-  if (orig_rettype == void_type_node)
+  if (VOID_TYPE_P (orig_rettype))
     return;
   t = TREE_TYPE (TREE_TYPE (fndecl));
   if (INTEGRAL_TYPE_P (t) || POINTER_TYPE_P (t))
@@ -1370,7 +1370,7 @@ simd_clone_adjust (struct cgraph_node *node)
   simd_clone_adjust_argument_types (node);
   targetm.simd_clone.adjust (node);
   tree retval = NULL_TREE;
-  if (orig_rettype != void_type_node)
+  if (!VOID_TYPE_P (orig_rettype))
     {
       poly_uint64 veclen;
       if (INTEGRAL_TYPE_P (orig_rettype) || POINTER_TYPE_P (orig_rettype))
diff --git a/gcc/testsuite/gcc.dg/gomp/pr111856.c b/gcc/testsuite/gcc.dg/gomp/pr111856.c
new file mode 100644
index 000000000000..ef162f585319
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/gomp/pr111856.c
@@ -0,0 +1,11 @@
+/* PR middle-end/111856 */
+/* { dg-do compile } */
+/* { dg-options "-fopenmp-simd -O2" } */
+
+typedef void T;
+int array[1000];
+#pragma omp declare simd notinbranch simdlen(4)
+T foo (int i)
+{
+  array[i] = 555;
+}