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Integrated 64bit long double into the toolchain #527

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@ZERICO2005 ZERICO2005 commented Jan 10, 2025 •
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Integrated a 64bit long double type into the toolchain, implemented using Berkeley SoftFloat 3e. SoftFloat is under toolchain/src/softfloat and CEdev/lib/softfloat currently. All CRT long double ABI calls have been implemented, along with some math.h functions.

The following routines are implemented with SoftFloat:

_dadd _dsub _dmul _ddiv _drem
_ftod _ltod _lltod _ultod _ulltod
_dtof _dtol _dtoll _dtoul _dtoull
fmal sqrtl fmodl modfl
truncl floorl ceill roundevenl nearbyintl
roundl lroundl llroundl
rintl lrintl llrint

I have also added the C23 int iszero(real-floating x) function to math.h. I also intend on adding issubnormal, nextup, and nextdown from C23.

@ZERICO2005 ZERICO2005 changed the title Implemented float64 long double using Berkeley SoftFloat 3e Integrated 64bit long double into the toolchain Jan 10, 2025
@ZERICO2005 ZERICO2005 mentioned this pull request Jan 12, 2025
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@ZERICO2005 @adriweb