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libsupc++: Fix handling of m68k extended real in <compare>

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PR libstdc++/116513
	* libsupc++/compare (_S_fp_bits) [__fmt == _M68k_80bit]: Shift
	padding out of exponent word.
This commit is contained in:
Andreas Schwab 2024-09-02 10:43:20 +02:00
parent e4d3e7f9ad
commit 4bf758b212
1 changed files with 6 additions and 1 deletions
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7
libstdc++-v3/libsupc++/compare
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@ -838,7 +838,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
using enum _Fp_fmt;
#endif
constexpr auto __fmt = _S_fp_fmt<_Tp>();
if constexpr (__fmt == _X86_80bit || __fmt == _M68k_80bit)
if constexpr (__fmt == _X86_80bit)
{
if constexpr (sizeof(_Tp) == 3 * sizeof(int32_t))
{
@ -851,6 +851,11 @@ namespace std _GLIBCXX_VISIBILITY(default)
return _Int<int16_t>(__ival._M_hi, __ival._M_lo);
}
}
else if constexpr (__fmt == _M68k_80bit)
{
auto __ival = __builtin_bit_cast(_Int<int32_t>, __val);
return _Int<int16_t>(__ival._M_hi >> 16, __ival._M_lo);
}
else if constexpr (sizeof(_Tp) == 2 * sizeof(int64_t))
{
#if __SIZEOF_INT128__