gcc/testsuite/gcc.target/arm/mmx-1.c

   1 /* Verify that if IP is saved to ensure stack alignment, we don't load
   2    it into sp.  */
   3 /* { dg-do compile } */
   4 /* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-mcpu=*" } { "-mcpu=iwmmxt" } } */
   5 /* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-mabi=*" } { "-mabi=iwmmxt" } } */
   6 /* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-march=*" } { "-march=iwmmxt" } } */
   7 /* { dg-skip-if "Test is specific to ARM mode" { arm*-*-* } { "-mthumb" } { "" } } */
   8 /* { dg-options "-O -mno-apcs-frame -mcpu=iwmmxt -mabi=iwmmxt" } */
   9 /* { dg-require-effective-target arm32 } */
  10 /* { dg-require-effective-target arm_iwmmxt_ok } */
  11 /* { dg-final { scan-assembler "push.*ip,\[ ]*pc" } } */
  12
  13 /* This function uses all the call-saved registers, namely r4, r5, r6,
  14    r7, r8, r9, sl, fp.  Since we also save lr, that leaves an odd
  15    number of registers, and the compiler will push ip to align the
  16    stack.  Make sure that we restore ip into ip, not into sp as is
  17    done when using a frame pointer.  The -mno-apcs-frame option
  18    permits the frame pointer to be used as an ordinary register.  */
  19
  20 void
  21 foo(void)
  22 {
  23   __asm volatile ("" : : :
  24                   "r4", "r5", "r6", "r7", "r8", "r9", "sl", "fp", "lr");
  25 }