branches_testcode.c

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

#include "testcode.h"


/* This code has 1,500,000 total branches               */
/*                 500,000 not-taken conditional branches   */
/*                 500,000 taken conditional branches       */
/*                 500,000 unconditional branches       */
int branches_testcode(void) {

#if defined(__i386__) || (defined __x86_64__)
    asm(    "\txor %%ecx,%%ecx\n"
        "\tmov $500000,%%ecx\n"
        "test_loop:\n"
        "\tjmp test_jmp\n"
        "\tnop\n"
        "test_jmp:\n"
        "\txor %%eax,%%eax\n"
        "\tjnz test_jmp2\n"
        "\tinc %%eax\n"
        "test_jmp2:\n"
        "\tdec %%ecx\n"
        "\tjnz test_loop\n"
        : /* no output registers */
        : /* no inputs */
        : "cc", "%ecx", "%eax" /* clobbered */
    );
        return 0;

#elif defined(__arm__)
    /* Initial code contributed by sam wang linux.swang _at_ gmail.com */
    asm(    "\teor r3,r3,r3\n"
        "\tldr r3,=500000\n"
            "test_loop:\n"
        "\tB test_jmp\n"
        "\tnop\n"
        "test_jmp:\n"
        "\teor r2,r2,r2\n"
        "\tcmp r2,#1\n"
        "\tbge test_jmp2\n"
        "\tnop\n"
        "\tadd r2,r2,#1\n"
        "test_jmp2:\n"
        "\tsub r3,r3,#1\n"
        "\tcmp r3,#1\n"
        "\tbgt test_loop\n"
        : /* no output registers */
        : /* no inputs       */
        : "cc", "r2", "r3" /* clobbered */
    );

    return 0;
#elif defined(__aarch64__)
    asm(    "\teor x3,x3,x3\n"
        "\tldr x3,=500000\n"
        "test_loop:\n"
        "\tB test_jmp\n"
        "\tnop\n"
        "test_jmp:\n"
        "\teor x2,x2,x2\n"
        "\tcmp x2,#1\n"
        "\tbge test_jmp2\n"
        "\tnop\n"
        "\tadd x2,x2,#1\n"
        "test_jmp2:\n"
        "\tsub x3,x3,#1\n"
        "\tcmp x3,#1\n"
        "\tbgt test_loop\n"
        : /* no output registers */
        : /* no inputs       */
        : "cc", "x2", "x3" /* clobbered */
    );

    return 0;
#elif defined(__powerpc__)
    /* Not really optimized */

    asm(    "\txor  3,3,3\n"
        "\tlis  3,500000@ha\n"
        "\taddi 3,3,500000@l\n"
            "test_loop:\n"
        "\tb    test_jmp\n"
        "\tnop\n"
        "test_jmp:\n"
        "\txor  4,4,4\n"
        "\tcmpwi    cr0,4,1\n"
        "\tbge  test_jmp2\n"
        "\tnop\n"
        "\taddi 4,4,1\n"
        "test_jmp2:\n"
        "\taddi 3,3,-1\n"
        "\tcmpwi    cr0,3,1\n"
        "\tbgt  test_loop\n"
        : /* no output registers */
        : /* no inputs       */
        : "cr0", "r3", "r4" /* clobbered */
    );

    return 0;
#endif

    return -1;

}


int random_branches_testcode(int number, int quiet) {

  int j,junk=0;
  double junk2=5.0;

   for(j=0;j<number;j++) {

    if (( ((random()>>2)^(random()>>4)) %1000)>500) goto label_false;

    junk++;   /* can't just add, the optimizer is way too clever */

    junk2*=junk;

    //printf("T");
      label_false:
    //printf("F");
    ;
      }
   if (!quiet) printf("%lf\n",junk2);

   return junk;
}