middle-end/98807 - more vector_element_bits fixes

This simplifies vector_element_bits further, avoiding any mode
dependence and instead relying on boolean vector construction
to populate element precision accordingly.

2021-01-25  Richard Biener  <rguenther@suse.de>

	PR middle-end/98807
	* tree.c (vector_element_bits): Always use precision of
	the element type for boolean vectors.

	* gcc.dg/pr98807.c: New testcase.

1 files changed, 1 insertions, 7 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 87862be..287e500 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -14027,13 +14027,7 @@ vector_element_bits (const_tree type)
 {
   gcc_checking_assert (VECTOR_TYPE_P (type));
   if (VECTOR_BOOLEAN_TYPE_P (type))
-    {
-      if (SCALAR_INT_MODE_P (TYPE_MODE (type)))
-	return 1;
-      else
-	return vector_element_size (tree_to_poly_uint64 (TYPE_SIZE (type)),
-				    TYPE_VECTOR_SUBPARTS (type));
-    }
+    return TYPE_PRECISION (TREE_TYPE (type));
   return tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)));
 }