[PATCH, ARM][2 of 2] Enable shrink-wrap for ARM

[Zhenqiang Chen]

Hi,

The patch is to enable shrink-wrap for TARGET_ARM and TARGET_THUMB2.

Bootstrapped and no make check regression.
All previous Linaro shrink-wrap bugs (http://goo.gl/6fGg5) are verified.

Is it OK?

Thanks!
-Zhenqiang

ChangeLog:
2013-03-21 Bernd Schmidt  <ber...@codesourcery.com>
           Zhenqiang Chen <zhenqiang.c...@linaro.org>

        * config/arm/arm-protos.h: Add and update function protos.
        * config/arm/arm.c (use_simple_return_p): New added.
        (thumb2_expand_return): Check simple_return flag.
        * config/arm/arm.md: Add simple_return and conditional simple_return.
        * config/arm/iterators.md: Add iterator for return and simple_return.

testsuite/ChangeLog:
2013-03-21 Zhenqiang Chen <zhenqiang.c...@linaro.org>

        * gcc.dg/shrink-wrap-alloca.c: New added.
        * gcc.dg/shrink-wrap-pretend.c: New added.
        * gcc.dg/shrink-wrap-sibcall.c: New added.

2-enable-shrink-wrap-for-arm.patch
Description: Binary data

/* { dg-do compile } */
/* { dg-options "-O2 -g" } */

extern int * alloca(int);
int *p;
void test(int a)
{
  if (a > 0)
    p = alloca(4);
  
}

/* { dg-do compile } */
/* { dg-options "-O2 -g" } */

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#define DEBUG_BUFFER_SIZE 80
int unifi_debug = 5;

void  unifi_trace(void* ospriv, int level, const char *fmt, ...)
{
   static char s[DEBUG_BUFFER_SIZE];
   va_list args;
   unsigned int len;
   if (!ospriv) return;
   
   if(unifi_debug >= level) 
     {
       va_start(args, fmt);
       len = vsnprintf(&(s)[0], (DEBUG_BUFFER_SIZE), fmt, args);
       va_end(args);
       if (len >= DEBUG_BUFFER_SIZE) 
	{
	  (s)[DEBUG_BUFFER_SIZE - 2] = '\n';
	  (s)[DEBUG_BUFFER_SIZE - 1] = 0;
	}
	
       printf("%s", s);
    }
}


/* { dg-do compile } */
/* { dg-options "-O2 -g" } */

unsigned char a, b, d, f, g;

int test();
int baz (int c)
{
  if (c == 0) return test();
  if (b & 1)
    {
      g = 0;
      int e = (a & 0x0f) - (g & 0x0f);

      if (!a)  b |= 0x80;
      a = e + test();
     f = g/5 + a*3879 + b *2985;
    }
   else
   {
     f = g + a*39879 + b *25;
   }
  return test();
}