gcc/testsuite/gcc.dg/spill-1.c

   1 /* This caused an ICE during register spilling when targeting thumb.
   2    There are 8 registers available for arithmetic operations (r0-r7)
   3    r7 is the frame pointer, and r0-r3 are used to pass arguments.
   4    Combine was extending the lives of the arguments (in r0-r3) up until the
   5    call to z. This leaves only 3 regs free which isn't enough to preform the
   6    doubleword addition.  */
   7 /* { dg-do compile } */
   8 /* { dg-options "-O2 -fno-omit-frame-pointer" } */
   9 void z(int);
  10 int foo(int a, int b, int c, int d, long long *q)
  11 {
  12   *q=*q+1;
  13   z (a+b+c+d);
  14 }
  15