[PATCH] D107240: [LLVM][NFC] Make multiple bitwise MathExtras functions constexpr
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 4 16:03:42 PDT 2021
craig.topper added inline comments.
================
Comment at: llvm/include/llvm/Support/MathExtras.h:192
unsigned long Index;
_BitScanReverse(&Index, Val);
return Index ^ 31;
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Does _BitScanReverse work in a constexpr in MSVC? The implementation in clang-cl doesn't work in constexpr, but clang-cl would use __builtin_clz.
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https://reviews.llvm.org/D107240/new/
https://reviews.llvm.org/D107240
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