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/* Check local register variables using a register conventionally
used as the frame pointer aren't clobbered under high register pressure. */
/* { dg-do run } */
/* { dg-options "-Os -mthumb -fomit-frame-pointer" } */
#include <stdlib.h>
int global=5;
void __attribute__((noinline)) foo(int p1, int p2, int p3, int p4)
{
if (global != 5 || p1 != 1 || p2 != 2 || p3 != 3 || p4 != 4)
abort();
}
int __attribute__((noinline)) test(int a, int b, int c, int d)
{
register unsigned long r __asm__("r7") = 0xdeadbeef;
int e;
/* ABCD are live after the call which should be enough
to cause r7 to be used if it weren't for the register variable. */
foo(a,b,c,d);
e = 0;
__asm__ __volatile__ ("mov %0, %2"
: "=r" (e)
: "0" (e), "r" (r));
global = a+b+c+d;
return e;
}
int main()
{
if (test(1, 2, 3, 4) != 0xdeadbeef)
abort();
if (global != 10)
abort();
return 0;
}
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