| 1 | // RUN: %clang_builtins %s %librt -o %t && %run %t |
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| 2 | // REQUIRES: librt_has_ffssi2 |
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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 index of the least significant 1-bit in a, or |
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| 8 | // the value zero if a is zero. The least significant bit is index one. |
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| 9 | |
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| 10 | COMPILER_RT_ABI int __ffssi2(si_int a); |
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| 11 | |
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| 12 | int test__ffssi2(si_int a, int expected) |
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| 13 | { |
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| 14 | int x = __ffssi2(a); |
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| 15 | if (x != expected) |
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| 16 | printf(format: "error in __ffssi2(0x%X) = %d, expected %d\n" , a, x, expected); |
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| 17 | return x != expected; |
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| 18 | } |
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| 19 | |
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| 20 | int main() |
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| 21 | { |
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| 22 | if (test__ffssi2(a: 0x00000000, expected: 0)) |
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| 23 | return 1; |
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| 24 | if (test__ffssi2(a: 0x00000001, expected: 1)) |
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| 25 | return 1; |
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| 26 | if (test__ffssi2(a: 0x00000002, expected: 2)) |
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| 27 | return 1; |
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| 28 | if (test__ffssi2(a: 0x00000003, expected: 1)) |
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| 29 | return 1; |
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| 30 | if (test__ffssi2(a: 0x00000004, expected: 3)) |
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| 31 | return 1; |
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| 32 | if (test__ffssi2(a: 0x00000005, expected: 1)) |
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| 33 | return 1; |
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| 34 | if (test__ffssi2(a: 0x0000000A, expected: 2)) |
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| 35 | return 1; |
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| 36 | if (test__ffssi2(a: 0x10000000, expected: 29)) |
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| 37 | return 1; |
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| 38 | if (test__ffssi2(a: 0x20000000, expected: 30)) |
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| 39 | return 1; |
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| 40 | if (test__ffssi2(a: 0x60000000, expected: 30)) |
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| 41 | return 1; |
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| 42 | if (test__ffssi2(a: 0x80000000u, expected: 32)) |
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| 43 | return 1; |
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| 44 | |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |
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