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43 lines
911 B
C
43 lines
911 B
C
#include <assert.h>
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static int mem;
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static unsigned long test_cmpxchgb(unsigned long orig)
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{
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unsigned long ret;
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mem = orig;
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asm("cmpxchgb %b[cmp],%[mem]"
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: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
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: [ cmp ] "r"(0x77), "a"(orig));
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return ret;
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}
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static unsigned long test_cmpxchgw(unsigned long orig)
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{
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unsigned long ret;
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mem = orig;
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asm("cmpxchgw %w[cmp],%[mem]"
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: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
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: [ cmp ] "r"(0x7777), "a"(orig));
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return ret;
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}
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static unsigned long test_cmpxchgl(unsigned long orig)
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{
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unsigned long ret;
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mem = orig;
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asm("cmpxchgl %[cmp],%[mem]"
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: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
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: [ cmp ] "r"(0x77777777u), "a"(orig));
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return ret;
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}
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int main()
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{
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unsigned long test = 0xdeadbeef12345678ull;
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assert(test == test_cmpxchgb(test));
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assert(test == test_cmpxchgw(test));
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assert(test == test_cmpxchgl(test));
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return 0;
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}
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