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65 lines
2.3 KiB
65 lines
2.3 KiB
3 years ago
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/* Test bitfield patterns. */
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/*
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* 1050: 48 83 ec 08 sub $0x8,%rsp
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* 1054: 8b 05 d6 2f 00 00 mov 0x2fd6(%rip),%eax # 4030 <val>
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* 105a: f6 c4 01 test $0x1,%ah
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* 105d: 75 4c jne 10ab <main+0x5b>
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* 105f: 8b 05 cb 2f 00 00 mov 0x2fcb(%rip),%eax # 4030 <val>
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* 1065: f6 c4 01 test $0x1,%ah
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* 1068: 74 6b je 10d5 <main+0x85>
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* 106a: 8b 05 c0 2f 00 00 mov 0x2fc0(%rip),%eax # 4030 <val>
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* 1070: f6 c4 0f test $0xf,%ah
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* 1073: 74 52 je 10c7 <main+0x77>
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* 1075: 8b 05 b5 2f 00 00 mov 0x2fb5(%rip),%eax # 4030 <val>
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* 107b: f6 c4 0f test $0xf,%ah
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* 107e: 75 39 jne 10b9 <main+0x69>
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* 1080: 8b 05 aa 2f 00 00 mov 0x2faa(%rip),%eax # 4030 <val>
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* 1086: 25 00 0f 00 00 and $0xf00,%eax
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* 108b: 3d 00 0f 00 00 cmp $0xf00,%eax
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* 1090: 74 5f je 10f1 <main+0xa1>
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* 1092: 8b 05 98 2f 00 00 mov 0x2f98(%rip),%eax # 4030 <val>
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* 1098: 25 00 0f 00 00 and $0xf00,%eax
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* 109d: 3d 00 0c 00 00 cmp $0xc00,%eax
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* 10a2: 74 3f je 10e3 <main+0x93>
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* 10a4: 31 c0 xor %eax,%eax
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* 10a6: 48 83 c4 08 add $0x8,%rsp
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* 10aa: c3 retq
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*/
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#include <stdio.h>
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volatile int val = 0xdeadbeef;
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int main(int argc, const char *argv[]) {
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/* Single-bit test for 0 or 1: single TEST on x64. */
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if ((val & 0x100) != 0) {
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printf("1\n");
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}
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if ((val & 0x100) == 0) {
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printf("2\n");
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}
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/* Multi-bit test for all zeroes: single TEST on x64. */
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if ((val & 0xf00) == 0) {
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printf("3\n");
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}
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/* Multi-bit test for not all zeroes (>= one-bit): single TEST on x64. */
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if ((val & 0xf00) != 0) {
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printf("3\n");
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}
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/* Multi-bit test for all ones: AND + CMP on x64. */
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if ((val & 0xf00) == 0xf00) {
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printf("4\n");
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}
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/* Multi-bit test for arbitrary value: AND + CMP on x64. */
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if ((val & 0xf00) == 0xc00) {
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printf("5\n");
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}
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return 0;
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}
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