@@ -1,3 +1,8 @@
+2011-10-27 David S. Miller <davem@davemloft.net>
+
+ * regcprop.c (copyprop_hardreg_forward_1): Reject the
+ transformation when we narrow the mode on big endian.
+
2011-10-27 Jakub Jelinek <jakub@redhat.com>
* config/i386/sse.md (avx_cvtpd2dq256_2, avx_cvttpd2dq256_2,
@@ -824,6 +824,14 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
if (hard_regno_nregs[regno][mode]
> hard_regno_nregs[regno][vd->e[regno].mode])
goto no_move_special_case;
+
+ /* And likewise, if we are narrowing on big endian the transformation
+ is also invalid. */
+ if (hard_regno_nregs[regno][mode]
+ < hard_regno_nregs[regno][vd->e[regno].mode]
+ && (GET_MODE_SIZE (vd->e[regno].mode) > UNITS_PER_WORD
+ ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN))
+ goto no_move_special_case;
}
/* If the destination is also a register, try to find a source