[gcc r12-1439] rs6000: MMA builtin usage ICEs when used in a #pragma omp parallel and using -fopenmp [PR100777]

[Peter Bergner <bergner@gcc.gnu.org>]

https://gcc.gnu.org/g:20073534c0ccca0a4e079c053ee0874af10b2ea0

commit r12-1439-g20073534c0ccca0a4e079c053ee0874af10b2ea0
Author: Peter Bergner <bergner@linux.ibm.com>
Date:   Mon Jun 14 16:55:18 2021 -0500

    rs6000: MMA builtin usage ICEs when used in a #pragma omp parallel and using -fopenmp [PR100777]
    
    Using an MMA builtin within an openmp parallel code block, leads to an SSA
    verification ICE on the temporaries we create while expanding the MMA builtins
    at gimple time.  The solution is to use create_tmp_reg_or_ssa_name(), which
    knows when to create either an SSA or register temporary.
    
    2021-06-14  Peter Bergner  <bergner@linux.ibm.com>
    
    gcc/
            PR target/100777
            * config/rs6000/rs6000-call.c (rs6000_gimple_fold_mma_builtin): Use
            create_tmp_reg_or_ssa_name().
    
    gcc/testsuite/
            PR target/100777
            * gcc.target/powerpc/pr100777.c: New test.

Diff:
---
 gcc/config/rs6000/rs6000-call.c             | 12 ++++++------
 gcc/testsuite/gcc.target/powerpc/pr100777.c | 24 ++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-call.c b/gcc/config/rs6000/rs6000-call.c
index 0ac6b6ef1bc..b67789845a5 100644
--- a/gcc/config/rs6000/rs6000-call.c
+++ b/gcc/config/rs6000/rs6000-call.c
@@ -11863,7 +11863,7 @@ rs6000_gimple_fold_mma_builtin (gimple_stmt_iterator *gsi)
       tree dst_ptr = gimple_call_arg (stmt, 0);
       tree src_ptr = gimple_call_arg (stmt, 1);
       tree src_type = TREE_TYPE (src_ptr);
-      tree src = make_ssa_name (TREE_TYPE (src_type));
+      tree src = create_tmp_reg_or_ssa_name (TREE_TYPE (src_type));
       gimplify_assign (src, build_simple_mem_ref (src_ptr), &new_seq);
 
       /* If we are not disassembling an accumulator/pair or our destination is
@@ -11887,7 +11887,7 @@ rs6000_gimple_fold_mma_builtin (gimple_stmt_iterator *gsi)
 	{
 	  new_decl = rs6000_builtin_decls[MMA_BUILTIN_XXMFACC_INTERNAL];
 	  new_call = gimple_build_call (new_decl, 1, src);
-	  src = make_ssa_name (vector_quad_type_node);
+	  src = create_tmp_reg_or_ssa_name (vector_quad_type_node);
 	  gimple_call_set_lhs (new_call, src);
 	  gimple_seq_add_stmt (&new_seq, new_call);
 	}
@@ -11902,7 +11902,7 @@ rs6000_gimple_fold_mma_builtin (gimple_stmt_iterator *gsi)
 	  unsigned index = WORDS_BIG_ENDIAN ? i : nvec - 1 - i;
 	  tree dst = build2 (MEM_REF, unsigned_V16QI_type_node, dst_base,
 			     build_int_cst (dst_type, index * 16));
-	  tree dstssa = make_ssa_name (unsigned_V16QI_type_node);
+	  tree dstssa = create_tmp_reg_or_ssa_name (unsigned_V16QI_type_node);
 	  new_call = gimple_build_call (new_decl, 2, src,
 					build_int_cstu (uint16_type_node, i));
 	  gimple_call_set_lhs (new_call, dstssa);
@@ -11925,7 +11925,7 @@ rs6000_gimple_fold_mma_builtin (gimple_stmt_iterator *gsi)
     {
       /* This built-in has a pass-by-reference accumulator input, so load it
 	 into a temporary accumulator for use as a pass-by-value input.  */
-      op[0] = make_ssa_name (vector_quad_type_node);
+      op[0] = create_tmp_reg_or_ssa_name (vector_quad_type_node);
       for (unsigned i = 1; i < nopnds; i++)
 	op[i] = gimple_call_arg (stmt, i);
       gimplify_assign (op[0], build_simple_mem_ref (acc), &new_seq);
@@ -11973,9 +11973,9 @@ rs6000_gimple_fold_mma_builtin (gimple_stmt_iterator *gsi)
     }
 
   if (fncode == VSX_BUILTIN_BUILD_PAIR || fncode == VSX_BUILTIN_ASSEMBLE_PAIR)
-    lhs = make_ssa_name (vector_pair_type_node);
+    lhs = create_tmp_reg_or_ssa_name (vector_pair_type_node);
   else
-    lhs = make_ssa_name (vector_quad_type_node);
+    lhs = create_tmp_reg_or_ssa_name (vector_quad_type_node);
   gimple_call_set_lhs (new_call, lhs);
   gimple_seq_add_stmt (&new_seq, new_call);
   gimplify_assign (build_simple_mem_ref (acc), lhs, &new_seq);
diff --git a/gcc/testsuite/gcc.target/powerpc/pr100777.c b/gcc/testsuite/gcc.target/powerpc/pr100777.c
new file mode 100644
index 00000000000..15742f67d8c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr100777.c
@@ -0,0 +1,24 @@
+/* PR target/100777 */
+/* { dg-require-effective-target power10_ok } */
+/* { dg-require-effective-target fopenmp } */
+/* { dg-options "-O1 -mdejagnu-cpu=power10 -fopenmp" } */
+
+/* Verify we do not ICE on the following.  */
+
+void
+foo (__vector_quad *dst)
+{
+#pragma omp parallel
+  {
+    __builtin_mma_xxsetaccz (dst);
+  }
+}
+
+void
+bar (__vector_quad *dst, __vector_quad *src)
+{
+#pragma omp parallel
+  {
+    __builtin_mma_disassemble_acc (dst, src);
+  }
+}