fmtlib/fmt
1
0
Fork 1
mirror of https://github.com/fmtlib/fmt.git synced 2025-07-29 18:27:40 +02:00
Code Issues Packages Projects Releases Wiki Activity

Check if right shift is arithmetic

Browse Source
This commit is contained in:
Victor Zverovich
2022-01-11 08:23:30 -08:00
parent 9ff91b18cd
commit a126b4d888
1 changed files with 1 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/fmt/format-inl.h
View File

@ -907,6 +907,7 @@ inline uint64_t umul96_lower64(uint32_t x, uint64_t y) FMT_NOEXCEPT {
// https://fmt.dev/papers/Grisu-Exact.pdf#page=5, section 3.4.
inline int floor_log10_pow2(int e) FMT_NOEXCEPT {
FMT_ASSERT(e <= 1700 && e >= -1700, "too large exponent");
static_assert((-1 >> 1) == -1, "right shift is not arithmetic");
const int shift = 22;
return (e * static_cast<int>(log10_2_significand >> (64 - shift))) >> shift;
}