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Update test for bsf private helper #2337

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Merged
merged 3 commits into from
Dec 17, 2021
Merged

Update test for bsf private helper #2337

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2d2c371
+Coverage for #2330
AlexGuteniev Nov 13, 2021
e9d664d
I'll order the usual, thanks!
StephanTLavavej Nov 17, 2021
620243c
Rework intrinsic guards for `/clr:pure` compat.
StephanTLavavej Dec 16, 2021
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17 changes: 12 additions & 5 deletions tests/std/tests/GH_001103_countl_zero_correctness/test.cpp
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Original file line number Diff line number Diff line change
@@ -1,20 +1,21 @@
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <bit>
#include <cassert>
#include <limits>
#if _HAS_CXX20
#include <bit>
#endif

// Indirectly test countl_zero on old x86/x64 processors by testing a private helper,
// Indirectly test countl_zero/countr_zero on old x86/x64 processors by testing a private helper,
// which is different from the usual branch.

// Currently need this test only in C++20 mode;
// may update to older C++ if the helper is used internally too, for example in <bitset>.

using namespace std;

int main() {
// This test is applicable only to x86 and x64 platforms
#if defined(_M_IX86) || defined(_M_X64)
#if _HAS_CXX20
assert(_Countl_zero_bsr(static_cast<unsigned char>(0x00)) == 8);
assert(_Countl_zero_bsr(static_cast<unsigned char>(0x13)) == 3);
assert(_Countl_zero_bsr(static_cast<unsigned char>(0x83)) == 0);
Expand All @@ -39,29 +40,35 @@ int main() {
assert(_Countl_zero_bsr(static_cast<unsigned long long>(0x0000'0000'0000'0013)) == 59);
assert(_Countl_zero_bsr(static_cast<unsigned long long>(0x8000'0000'0000'0003)) == 0);
assert(_Countl_zero_bsr(static_cast<unsigned long long>(0xF000'0000'0000'0008)) == 0);
#endif // ^^^ C++20 ^^^

assert(_Countr_zero_bsf(static_cast<unsigned char>(0x00)) == 8);
assert(_Countr_zero_bsf(static_cast<unsigned char>(0x13)) == 0);
assert(_Countr_zero_bsf(static_cast<unsigned char>(0x82)) == 1);
assert(_Countr_zero_bsf(static_cast<unsigned char>(0x80)) == 7);
assert(_Countr_zero_bsf(static_cast<unsigned char>(0xF8)) == 3);

assert(_Countr_zero_bsf(static_cast<unsigned short>(0x0000)) == 16);
assert(_Countr_zero_bsf(static_cast<unsigned short>(0x0013)) == 0);
assert(_Countr_zero_bsf(static_cast<unsigned short>(0x8002)) == 1);
assert(_Countr_zero_bsf(static_cast<unsigned short>(0x8000)) == 15);
assert(_Countr_zero_bsf(static_cast<unsigned short>(0xF008)) == 3);

assert(_Countr_zero_bsf(static_cast<unsigned int>(0x0000'0000)) == 32);
assert(_Countr_zero_bsf(static_cast<unsigned int>(0x0000'0013)) == 0);
assert(_Countr_zero_bsf(static_cast<unsigned int>(0x8000'0002)) == 1);
assert(_Countr_zero_bsf(static_cast<unsigned int>(0x8000'0000)) == 31);
assert(_Countr_zero_bsf(static_cast<unsigned int>(0xF000'0008)) == 3);

assert(_Countr_zero_bsf(static_cast<unsigned long>(0x0000'0000)) == 32);
assert(_Countr_zero_bsf(static_cast<unsigned long>(0x0000'0013)) == 0);
assert(_Countr_zero_bsf(static_cast<unsigned long>(0x8000'0002)) == 1);
assert(_Countr_zero_bsf(static_cast<unsigned long>(0x8000'0000)) == 31);
assert(_Countr_zero_bsf(static_cast<unsigned long>(0xF000'0008)) == 3);

assert(_Countr_zero_bsf(static_cast<unsigned long long>(0x0000'0000'0000'0000)) == 64);
assert(_Countr_zero_bsf(static_cast<unsigned long long>(0x0000'0000'0000'0013)) == 0);
assert(_Countr_zero_bsf(static_cast<unsigned long long>(0x8000'0000'0000'0002)) == 1);
assert(_Countr_zero_bsf(static_cast<unsigned long long>(0x8000'0000'0000'0000)) == 63);
assert(_Countr_zero_bsf(static_cast<unsigned long long>(0xF000'0000'0000'0008)) == 3);
#endif // ^^^ defined(_M_IX86) || defined(_M_X64) ^^^
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