------- Comment #5 from roger at eyesopen dot com 2006-01-25 01:05 -------
I'm testing the following patch...
Index: combine.c
===================================================================
*** combine.c (revision 109912)
--- combine.c (working copy)
*************** try_combine (rtx i3, rtx i2, rtx i1, int
*** 1967,1972 ****
--- 1967,1983 ----
if (BITS_BIG_ENDIAN)
offset = GET_MODE_BITSIZE (GET_MODE (XEXP (dest, 0)))
- width - offset;
+
+ /* If this is the low part, we're done. */
+ if (subreg_lowpart_p (XEXP (dest, 0)))
+ ;
+ /* Handle the case where inner is twice the size of outer. */
+ else if (GET_MODE_BITSIZE (GET_MODE (SET_DEST (temp)))
+ == 2 * GET_MODE_BITSIZE (GET_MODE (XEXP (dest, 0))))
+ offset += GET_MODE_BITSIZE (GET_MODE (XEXP (dest, 0)));
+ /* Otherwise give up for now. */
+ else
+ offset = -1;
}
}
else if (subreg_lowpart_p (dest))
My apologies for any inconvenience.
--
roger at eyesopen dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |roger at eyesopen dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25703
