backport the fixes of PR target/64011 and /61749 to 4.9 gcc

[weixiangyu]

Hi
Patch modified. Use %wu instead of HOST_WIDE_INT_PRINT_UNSIGNED. 
Tested ok on aarch64-linux(big-endian and little-endian) with qemu.

Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog	(revision 223867)
+++ gcc/ChangeLog	(working copy)
@@ -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.
Index: gcc/expmed.c
===================================================================
--- gcc/expmed.c	(revision 223867)
+++ gcc/expmed.c	(working copy)
@@ -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

Thanks!
XIangyu Wei

-----Original Message-----
From: Joseph Myers [mailto:joseph@codesourcery.com] 
Sent: Wednesday, June 10, 2015 6:18 PM
To: weixiangyu
Cc: James Greenhalgh; gcc-patches@gcc.gnu.org; Marcus Shawcroft; Richard Earnshaw; Richard Earnshaw
Subject: RE: backport the fixes of PR target/64011 and /61749 to 4.9 gcc

On Wed, 10 Jun 2015, weixiangyu wrote:

> +  if (bitsize + bitnum > unit && bitnum < unit) 
> +    { 
> +      warning (OPT_Wextra, "write of "HOST_WIDE_INT_PRINT_UNSIGNED"bit data " 
> +               "outside the bound of destination object, data truncated into " 
> +               HOST_WIDE_INT_PRINT_UNSIGNED"bit", bitsize, unit - 
> + bitnum);

HOST_WIDE_INT_PRINT_UNSIGNED is a printf format, which depends on the host and is not suitable for any translatable string, not a format for GCC's pretty printers.  Use %wu instead in any call to a GCC diagnostic function.  Mainline appears to have this correct.

--
Joseph S. Myers
joseph@codesourcery.com
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