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

[Richard Biener]

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.

Bootstrapped and tested on x86_64-unknown-linux-gnu.

OK?

Thanks,
Richard.

        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.
---
 gcc/gimple-isel.cc                         |  3 ++-
 gcc/testsuite/gcc.target/i386/pr113622-1.c | 12 ++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr113622-1.c

diff --git a/gcc/gimple-isel.cc b/gcc/gimple-isel.cc
index 7e2392ecd38..e94f292dd38 100644
--- a/gcc/gimple-isel.cc
+++ b/gcc/gimple-isel.cc
@@ -104,7 +104,8 @@ gimple_expand_vec_set_extract_expr (struct function *fun,
       machine_mode outermode = TYPE_MODE (TREE_TYPE (view_op0));
       machine_mode extract_mode = TYPE_MODE (TREE_TYPE (ref));
 
-      if (auto_var_in_fn_p (view_op0, fun->decl)
+      if ((auto_var_in_fn_p (view_op0, fun->decl)
+          || DECL_HARD_REGISTER (view_op0))
          && !TREE_ADDRESSABLE (view_op0)
          && ((!is_extract && can_vec_set_var_idx_p (outermode))
              || (is_extract
diff --git a/gcc/testsuite/gcc.target/i386/pr113622-1.c 
b/gcc/testsuite/gcc.target/i386/pr113622-1.c
new file mode 100644
index 00000000000..2d6cb3c89a8
--- /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("zmm2"), b asm("zmm0"), c asm("zmm1");
+
+void
+test (void)
+{
+  for (int i = 0; i < 8; i++)
+    c[i] = a[i] < b[i] ? 0.1 : 0.2;
+}
-- 
2.35.3