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Fix large shift in uint128_fallback

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This commit is contained in:
Victor Zverovich 2022-07-10 08:14:18 -07:00
parent e1d3d3a326
commit 2a1b3ac629
2 changed files with 5 additions and 1 deletions
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2
include/fmt/format.h
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@ -366,10 +366,12 @@ class uint128_fallback {
}
FMT_CONSTEXPR auto operator>>(int shift) const -> uint128_fallback {
if (shift == 64) return {0, hi_};
if (shift > 64) return uint128_fallback(0, hi_) >> (shift - 64);
return {hi_ >> shift, (hi_ << (64 - shift)) | (lo_ >> shift)};
}
FMT_CONSTEXPR auto operator<<(int shift) const -> uint128_fallback {
if (shift == 64) return {lo_, 0};
if (shift > 64) return uint128_fallback(lo_, 0) << (shift - 64);
return {hi_ << shift | (lo_ >> (64 - shift)), (lo_ << shift)};
}
FMT_CONSTEXPR auto operator>>=(int shift) -> uint128_fallback& {

4
test/format-test.cc
View File

@ -59,6 +59,8 @@ TEST(uint128_test, shift) {
EXPECT_EQ(static_cast<uint64_t>(n), 0x8000000000000000);
n = n >> 62;
EXPECT_EQ(static_cast<uint64_t>(n), 42);
EXPECT_EQ(uint128_fallback(1) << 112, uint128_fallback(0x1000000000000, 0));
EXPECT_EQ(uint128_fallback(0x1000000000000, 0) >> 112, uint128_fallback(1));
}
TEST(uint128_test, minus) {
@ -234,7 +236,7 @@ TEST(util_test, format_system_error) {
throws_on_alloc = true;
}
if (!throws_on_alloc) {
fmt::print("warning: std::allocator allocates {} chars", max_size);
fmt::print("warning: std::allocator allocates {} chars\n", max_size);
return;
}
}