middle-end/113622 - allow .VEC_SET and .VEC_EXTRACT for global hard regs

The following expands .VEC_SET and .VEC_EXTRACT instruction selection
to global hard registers, not only automatic variables (possibly)
promoted to registers.  This can avoid some ICEs later and create
better code.

	PR middle-end/113622
	* gimple-isel.cc (gimple_expand_vec_set_extract_expr):
	Also allow DECL_HARD_REGISTER variables.

	* gcc.target/i386/pr113622-1.c: New testcase.

(cherry picked from commit 96bc048d78f804bac0fa7b2ca3b6dd3a04c68217)

diff --git a/gcc/gimple-isel.cc b/gcc/gimple-isel.cc
index ef688ddb57f37b8724e86b93299383225264944c..760029d27c97d1b9880f031e84373491a0b3f433 100644 (file)
--- a/gcc/gimple-isel.cc
+++ b/gcc/gimple-isel.cc
@@ -77,7 +77,8 @@ gimple_expand_vec_set_expr (struct function *fun, gimple_stmt_iterator *gsi)
       tree pos = TREE_OPERAND (lhs, 1);
       tree view_op0 = TREE_OPERAND (op0, 0);
       machine_mode outermode = TYPE_MODE (TREE_TYPE (view_op0));
-      if (auto_var_in_fn_p (view_op0, fun->decl)
+      if ((auto_var_in_fn_p (view_op0, fun->decl)
+          || (VAR_P (view_op0) && DECL_HARD_REGISTER (view_op0)))
          && !TREE_ADDRESSABLE (view_op0) && can_vec_set_var_idx_p (outermode))
        {
          location_t loc = gimple_location (stmt);

diff --git a/gcc/testsuite/gcc.target/i386/pr113622-1.c b/gcc/testsuite/gcc.target/i386/pr113622-1.c
new file mode 100644 (file)
index 0000000..d3a51cd
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr113622-1.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512f -w" } */
+
+typedef float __attribute__ ((vector_size (64))) vec;
+register vec a asm("zmm5"), b asm("zmm6"), c asm("zmm7");
+
+void
+test (void)
+{
+  for (int i = 0; i < 8; i++)
+    c[i] = a[i] < b[i] ? 0.1 : 0.2;
+}