LOAD_EXTEND_OP is about extending a subword value to a word. The final
wide_int should therefore be word_mode rather than GET_MODE (src).
Tested on powerpc64-linux-gnu and by rerunning the assembly comparison.
OK to install?
Thanks,
Richard
Index: gcc/postreload.c
===================================================================
--- gcc/postreload.c 2013-11-09 09:39:16.947734730 +0000
+++ gcc/postreload.c 2013-11-09 09:39:29.721821066 +0000
@@ -303,21 +303,19 @@ reload_cse_simplify_set (rtx set, rtx in
switch (extend_op)
{
case ZERO_EXTEND:
- result = wide_int (std::make_pair (this_rtx, GET_MODE (src)));
- if (GET_MODE_PRECISION (GET_MODE (src))
- > GET_MODE_PRECISION (word_mode))
- result = wi::zext (result, GET_MODE_PRECISION (word_mode));
+ result = wide_int::from (std::make_pair (this_rtx,
+ GET_MODE (src)),
+ BITS_PER_WORD, UNSIGNED);
break;
case SIGN_EXTEND:
- result = wide_int (std::make_pair (this_rtx, GET_MODE (src)));
- if (GET_MODE_PRECISION (GET_MODE (src))
- > GET_MODE_PRECISION (word_mode))
- result = wi::sext (result, GET_MODE_PRECISION (word_mode));
+ result = wide_int::from (std::make_pair (this_rtx,
+ GET_MODE (src)),
+ BITS_PER_WORD, SIGNED);
break;
default:
gcc_unreachable ();
}
- this_rtx = immed_wide_int_const (result, GET_MODE (src));
+ this_rtx = immed_wide_int_const (result, word_mode);
}
#endif
this_cost = set_src_cost (this_rtx, speed);