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[flang] Control alignment of constant folded reals #149381

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Merged
merged 5 commits into from
Jul 21, 2025
Merged

[flang] Control alignment of constant folded reals #149381

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a155a35
[flang] Control alignment of constant folded reals
eugeneepshteyn Jul 17, 2025
43102f9
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eugeneepshteyn Jul 17, 2025
5df6817
Merge branch 'llvm:main' into fold-real-align
eugeneepshteyn Jul 17, 2025
26432b5
Comment update
eugeneepshteyn Jul 17, 2025
cc1a96d
Merge branch 'llvm:main' into fold-real-align
eugeneepshteyn Jul 20, 2025
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1 change: 1 addition & 0 deletions flang/include/flang/Evaluate/integer.h
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Expand Up @@ -74,6 +74,7 @@ class Integer {
static_assert(std::is_unsigned_v<BigPart>);
static_assert(CHAR_BIT * sizeof(BigPart) >= 2 * partBits);
static constexpr bool littleEndian{IS_LITTLE_ENDIAN};
static constexpr int alignment{ALIGNMENT};

private:
static constexpr int maxPartBits{CHAR_BIT * sizeof(Part)};
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5 changes: 4 additions & 1 deletion flang/include/flang/Evaluate/real.h
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Expand Up @@ -490,7 +490,10 @@ template <typename WORD, int PREC> class Real {
bool isNegative, int exponent, const Fraction &, Rounding, RoundingBits,
bool multiply = false);

Word word_{}; // an Integer<>
// Require alignment, in case code generation on x86_64 decides that our
// Real object is suitable for SSE2 instructions and then gets surprised
// by unaligned address.
alignas(Word::alignment / 8) Word word_{}; // an Integer<>
};

extern template class Real<Integer<16>, 11>; // IEEE half format
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