re PR c++/82084 (ICE: constructing wstring with -O3)

2017-09-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82084
	* fold-const.c (can_native_encode_string_p): Handle wide characters.

From-SVN: r251711

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5f60fe2..7f5b384 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2017-09-05  Richard Biener  <rguenther@suse.de>
 
+       PR tree-optimization/82084
+       * fold-const.c (can_native_encode_string_p): Handle wide characters.
+
+2017-09-05  Richard Biener  <rguenther@suse.de>
+
        PR tree-optimization/82102
        * tree-ssa-pre.c (fini_eliminate): Check if lhs is NULL.
 

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 4904830..0cb2301 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7489,10 +7489,11 @@ can_native_encode_string_p (const_tree expr)
 {
   tree type = TREE_TYPE (expr);
 
-  if (TREE_CODE (type) != ARRAY_TYPE
+  /* Wide-char strings are encoded in target byte-order so native
+     encoding them is trivial.  */
+  if (BITS_PER_UNIT != CHAR_BIT
+      || TREE_CODE (type) != ARRAY_TYPE
       || TREE_CODE (TREE_TYPE (type)) != INTEGER_TYPE
-      || (GET_MODE_BITSIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (type)))
-         != BITS_PER_UNIT)
       || !tree_fits_shwi_p (TYPE_SIZE_UNIT (type)))
     return false;
   return true;