===================================================================
@@ -1,3 +1,10 @@
+2015-06-11 Xiangyu Wei <weixiangyu@huawei.com>
+
+ Backport from mainline r219717:
+ 2015-01-15 Jiong Wang <jiong.wang@arm.com>
+ PR rtl-optimization/64011
+ * expmed.c (store_bit_field_using_insv): Warn and truncate bitsize when
+ there is partial overflow.
2015-05-28 Mike Frysinger <vapier@gentoo.org>
* config/nios2/linux.h (CPP_SPEC): Define.
===================================================================
@@ -540,6 +540,21 @@ store_bit_field_using_insv (const extraction_insn
copy_back = true;
}
+ /* There are similar overflow check at the start of store_bit_field_1,
+ but that only check the situation where the field lies completely
+ outside the register, while there do have situation where the field
+ lies partialy in the register, we need to adjust bitsize for this
+ partial overflow situation. Without this fix, pr48335-2.c on big-endian
+ will broken on those arch support bit insert instruction, like arm, aarch64
+ etc. */
+ if (bitsize + bitnum > unit && bitnum < unit)
+ {
+ warning (OPT_Wextra, "write of %wu-bit data outside the bound of "
+ "destination object, data truncated into %wu-bit",
+ bitsize, unit - bitnum);
+ bitsize = unit - bitnum;
+ }
+
/* If BITS_BIG_ENDIAN is zero on a BYTES_BIG_ENDIAN machine, we count
"backwards" from the size of the unit we are inserting into.
Otherwise, we count bits from the most significant on a