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update CI to ubuntu 24 + safe a shift value to a variable (for elegance)

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This commit is contained in:
Daniel Lemire 2024-07-22 09:36:14 -04:00
parent 9468d50c89
commit ef9a60d516
2 changed files with 6 additions and 5 deletions
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6
.github/workflows/ubuntu22-gcc13.yml → .github/workflows/ubuntu24.yml vendored
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@ -4,20 +4,20 @@ on: [push, pull_request]
jobs:
ubuntu-build:
runs-on: ubuntu-22.04
runs-on: ubuntu-24.04
steps:
- uses: actions/checkout@v3
- name: Use cmake
run: |
mkdir build &&
cd build &&
CXX=g++-13 CXXFLAGS=-Werror cmake -DFASTFLOAT_TEST=ON .. &&
CXXFLAGS=-Werror cmake -DFASTFLOAT_TEST=ON .. &&
cmake --build . &&
ctest --output-on-failure
- name: Use cmake CXX23
run: |
mkdir build20 &&
cd build20 &&
CXX=g++-13 CXXFLAGS=-Werror cmake -DFASTFLOAT_CONSTEXPR_TESTS=ON -DFASTFLOAT_FIXEDWIDTH_TESTS=ON -DFASTFLOAT_CXX_STANDARD=23 -DFASTFLOAT_TEST=ON .. &&
CXXFLAGS=-Werror cmake -DFASTFLOAT_CONSTEXPR_TESTS=ON -DFASTFLOAT_FIXEDWIDTH_TESTS=ON -DFASTFLOAT_CXX_STANDARD=23 -DFASTFLOAT_TEST=ON .. &&
cmake --build . &&
ctest --output-on-failure

5
include/fast_float/decimal_to_binary.h
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@ -127,8 +127,9 @@ adjusted_mantissa compute_float(int64_t q, uint64_t w) noexcept {
// but in practice, we can win big with the compute_product_approximation if its additional branch
// is easily predicted. Which is best is data specific.
int upperbit = int(product.high >> 63);
int shift = upperbit + 64 - binary::mantissa_explicit_bits() - 3;
answer.mantissa = product.high >> (upperbit + 64 - binary::mantissa_explicit_bits() - 3);
answer.mantissa = product.high >> shift;
answer.power2 = int32_t(detail::power(int32_t(q)) + upperbit - lz - binary::minimum_exponent());
if (answer.power2 <= 0) { // we have a subnormal?
@ -164,7 +165,7 @@ adjusted_mantissa compute_float(int64_t q, uint64_t w) noexcept {
// To be in-between two floats we need that in doing
// answer.mantissa = product.high >> (upperbit + 64 - binary::mantissa_explicit_bits() - 3);
// ... we dropped out only zeroes. But if this happened, then we can go back!!!
if((answer.mantissa << (upperbit + 64 - binary::mantissa_explicit_bits() - 3)) == product.high) {
if((answer.mantissa << shift) == product.high) {
answer.mantissa &= ~uint64_t(1); // flip it so that we do not round up
}
}