4 typedef unsigned long long int ULong;
5 typedef unsigned int UInt;
7 __attribute__((noinline))
8 void do_lzcnt64 ( /*OUT*/UInt* flags, /*OUT*/ULong* res, ULong arg )
10 ULong block[3] = { arg, 0ULL, 0ULL };
12 "movabsq $0x5555555555555555, %%r11" "\n\t"
13 "lzcntq 0(%0), %%r11" "\n\t"
14 "movq %%r11, 8(%0)" "\n\t"
17 "movq %%r11, 16(%0)" "\n"
18 : : "r"(&block[0]) : "r11","cc","memory"
21 *flags = block[2] & 0x8d5;
24 __attribute__((noinline))
25 void do_lzcnt32 ( /*OUT*/UInt* flags, /*OUT*/ULong* res, ULong arg )
27 ULong block[3] = { arg, 0ULL, 0ULL };
29 "movabsq $0x5555555555555555, %%r11" "\n\t"
30 "lzcntl 0(%0), %%r11d" "\n\t"
31 "movq %%r11, 8(%0)" "\n\t"
34 "movq %%r11, 16(%0)" "\n"
35 : : "r"(&block[0]) : "r11","cc","memory"
38 *flags = block[2] & 0x8d5;
41 __attribute__((noinline))
42 void do_lzcnt16 ( /*OUT*/UInt* flags, /*OUT*/ULong* res, ULong arg )
44 ULong block[3] = { arg, 0ULL, 0ULL };
46 "movabsq $0x5555555555555555, %%r11" "\n\t"
47 "lzcntw 0(%0), %%r11w" "\n\t"
48 "movq %%r11, 8(%0)" "\n\t"
51 "movq %%r11, 16(%0)" "\n"
52 : : "r"(&block[0]) : "r11","cc","memory"
55 *flags = block[2] & 0x8d5;
62 w = 0xFEDC192837475675ULL;
66 do_lzcnt64(&flags, &res, w);
67 printf("lzcntq %016llx -> %016llx %04x\n", w, res, flags);
69 w = ((w >> 2) | (w >> 1)) + (w / 17ULL);
72 w = 0xFEDC192837475675ULL;
76 do_lzcnt32(&flags, &res, w);
77 printf("lzcntl %016llx -> %016llx %04x\n", w, res, flags);
79 w = ((w >> 2) | (w >> 1)) + (w / 17ULL);
82 w = 0xFEDC192837475675ULL;
86 do_lzcnt16(&flags, &res, w);
87 printf("lzcntw %016llx -> %016llx %04x\n", w, res, flags);
89 w = ((w >> 2) | (w >> 1)) + (w / 17ULL);