[PATCH, ARM] Fix ICE due to out of bound.

[Zhenqiang Chen]

Hi,

ICE when compiling gcc.target/arm/neon-modes-3.c with "-g" in
arm_dwarf_register_span since parts[8] is out of bound for XImode.
GET_MODE_SIZE (XImode) / 4 is 16. "rtx parts[8]" can not hold all the
registers.

According to arm-modes.def, 16 should be the biggest number. So the
patch updates parts to

rtx parts[16];

Bootstrap and no make check regression on ARM Chrome book.

OK for trunk?

Thanks!
-Zhenqiang

ChangeLog:
2014-03-19  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    * config/arm/arm.c (arm_dwarf_register_span): Update the element number
    of parts.

testsuite/ChangeLog:
2014-03-19  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    * gcc.target/arm/neon-modes-3.c: Add "-g" option.

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index a68ed8d..c4466c1 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -28692,7 +28692,7 @@ arm_dwarf_register_span (rtx rtl)
 {
   enum machine_mode mode;
   unsigned regno;
-  rtx parts[8];
+  rtx parts[16];
   int nregs;
   int i;

diff --git a/gcc/testsuite/gcc.target/arm/neon-modes-3.c
b/gcc/testsuite/gcc.target/arm/neon-modes-3.c
index fe81875..f3e4f33 100644
--- a/gcc/testsuite/gcc.target/arm/neon-modes-3.c
+++ b/gcc/testsuite/gcc.target/arm/neon-modes-3.c
@@ -1,6 +1,6 @@
 /* { dg-do compile } */
 /* { dg-require-effective-target arm_neon_ok } */
-/* { dg-options "-O" } */
+/* { dg-options "-O -g" } */
 /* { dg-add-options arm_neon } */

 #include <arm_neon.h>