| 1 | // RUN: %clang_builtins %s %librt -o %t && %run %t |
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| 2 | // REQUIRES: librt_has_clzdi2 |
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| 3 | |
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| 4 | #include "int_lib.h" |
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| 5 | #include <stdio.h> |
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| 6 | |
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| 7 | // Returns: the number of leading 0-bits |
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| 8 | |
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| 9 | // Precondition: a != 0 |
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| 10 | |
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| 11 | COMPILER_RT_ABI int __clzdi2(di_int a); |
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| 12 | |
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| 13 | int test__clzdi2(di_int a, int expected) |
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| 14 | { |
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| 15 | int x = __clzdi2(a); |
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| 16 | if (x != expected) |
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| 17 | printf(format: "error in __clzdi2(0x%llX) = %d, expected %d\n" , a, x, expected); |
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| 18 | return x != expected; |
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| 19 | } |
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| 20 | |
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| 21 | char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0}; |
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| 22 | |
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| 23 | int main() |
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| 24 | { |
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| 25 | const int N = (int)(sizeof(di_int) * CHAR_BIT); |
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| 26 | // if (test__clzdi2(0x00000000, N)) // undefined |
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| 27 | // return 1; |
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| 28 | if (test__clzdi2(a: 0x00000001, expected: N-1)) |
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| 29 | return 1; |
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| 30 | if (test__clzdi2(a: 0x00000002, expected: N-2)) |
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| 31 | return 1; |
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| 32 | if (test__clzdi2(a: 0x00000003, expected: N-2)) |
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| 33 | return 1; |
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| 34 | if (test__clzdi2(a: 0x00000004, expected: N-3)) |
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| 35 | return 1; |
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| 36 | if (test__clzdi2(a: 0x00000005, expected: N-3)) |
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| 37 | return 1; |
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| 38 | if (test__clzdi2(a: 0x0000000A, expected: N-4)) |
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| 39 | return 1; |
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| 40 | if (test__clzdi2(a: 0x1000000A, expected: N/2+3)) |
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| 41 | return 1; |
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| 42 | if (test__clzdi2(a: 0x2000000A, expected: N/2+2)) |
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| 43 | return 1; |
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| 44 | if (test__clzdi2(a: 0x6000000A, expected: N/2+1)) |
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| 45 | return 1; |
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| 46 | if (test__clzdi2(a: 0x8000000AuLL, expected: N/2)) |
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| 47 | return 1; |
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| 48 | if (test__clzdi2(a: 0x000005008000000AuLL, expected: 21)) |
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| 49 | return 1; |
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| 50 | if (test__clzdi2(a: 0x020005008000000AuLL, expected: 6)) |
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| 51 | return 1; |
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| 52 | if (test__clzdi2(a: 0x720005008000000AuLL, expected: 1)) |
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| 53 | return 1; |
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| 54 | if (test__clzdi2(a: 0x820005008000000AuLL, expected: 0)) |
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| 55 | return 1; |
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| 56 | |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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