http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55235
--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-11-07 19:05:33
UTC ---
It looks to me that this is the problematic change:
--- trunk/gcc/expr.c 2012/10/20 20:16:27 192640
+++ trunk/gcc/expr.c 2012/10/20 21:00:23 192641
(...)
@@ -5225,21 +5244,26 @@
supposed to be bit-copied or bit-initialized. */
&& expr_size (exp) != const0_rtx)
{
- if (GET_MODE (temp) != GET_MODE (target)
- && GET_MODE (temp) != VOIDmode)
+ if (GET_MODE (temp) != GET_MODE (target) && GET_MODE (temp) != VOIDmode)
{
- int unsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
- if (GET_MODE (target) == BLKmode
- && GET_MODE (temp) == BLKmode)
- emit_block_move (target, temp, expr_size (exp),
- (call_param_p
- ? BLOCK_OP_CALL_PARM
- : BLOCK_OP_NORMAL));
- else if (GET_MODE (target) == BLKmode)
- store_bit_field (target, INTVAL (expr_size (exp)) * BITS_PER_UNIT,
- 0, 0, 0, GET_MODE (temp), temp);
+ if (GET_MODE (target) == BLKmode)
+ {
+ if (REG_P (temp))
+ {
+ if (TREE_CODE (exp) == CALL_EXPR)
+ copy_blkmode_from_reg (target, temp, TREE_TYPE (exp));
+ else
+ store_bit_field (target,
+ INTVAL (expr_size (exp)) * BITS_PER_UNIT,
+ 0, 0, 0, GET_MODE (temp), temp);
+ }
+ else
+ emit_block_move (target, temp, expr_size (exp),
+ (call_param_p
+ ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
+ }
emit_block_move was guarded with BLKmode guard on both operands, all other went
through store_bit_field.
