gcc/testsuite/gcc.target/i386/pr44281.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target lp64 } */
   3 /* { dg-options "-std=gnu99 -O2" } */
   4 /* { dg-final { scan-assembler "salq\[ \\t\]+\\\$8, %rbx" } } */
   5
   6 #include <stdint.h>
   7
   8 register uint64_t global_flag_stack __asm__("rbx");
   9
  10 void push_flag_into_global_reg_var(uint64_t a, uint64_t b) {
  11   uint64_t flag = (a==b);
  12   global_flag_stack <<= 8;
  13   global_flag_stack  |= flag;
  14 }