[PATCH] narrowing initializers and initializer_constant_valid_p_1

[PATCH] narrowing initializers and initializer_constant_valid_p_1

[Richard Biener]

initializer_constant_valid_p_1 attempts to handle narrowing
differences and sums but fails to handle when the overall
value looks like

  VIEW_CONVERT_EXPR<long long int>(NON_LVALUE_EXPR <v>
    -  VEC_COND_EXPR < { 0, 0 } == { 0, 0 } , { -1, -1 } , { 0, 0 } > )

where endtype is scalar integer but value is a vector type.
In this particular case all is good and we recurse since
two vector lanes is more than 64bits of long long.  But still
it compares apples and oranges.

Fixed by appropriately also requiring the type of the
value to be scalar integral.

Bootstrap and regtest pending on x86_64-unknown-linux-gnu.  This
seems to be the last fallout in the testsuite for the
TYPE_PRECISION checking patch.

	* varasm.cc (initializer_constant_valid_p_1): Also
	constrain the type of value to be scalar integral
	before dispatching to narrowing_initializer_constant_valid_p.
---
 gcc/varasm.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/varasm.cc b/gcc/varasm.cc
index f2a19aa6dbd..542315f88cd 100644
--- a/gcc/varasm.cc
+++ b/gcc/varasm.cc
@@ -4944,6 +4944,7 @@ initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
       if (cache && cache[0] == value)
 	return cache[1];
       if (! INTEGRAL_TYPE_P (endtype)
+	  || ! INTEGRAL_TYPE_P (TREE_TYPE (value))
 	  || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
 	{
 	  tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
@@ -4980,6 +4981,7 @@ initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
       if (cache && cache[0] == value)
 	return cache[1];
       if (! INTEGRAL_TYPE_P (endtype)
+	  || ! INTEGRAL_TYPE_P (TREE_TYPE (value))
 	  || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
 	{
 	  tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
-- 
2.35.3