updated signaling NaN definitions and optimized softfloat #604
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…lined functions only used by f64_to_f32 saving an additional 118 bytes
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Changed the definition of quiet NaN for issignaling:
Inlined functions that were only used once in softfloat saving ~118 bytes. softfloat_normSubnormalF64Sig was a fairly simple function, so I was able to implement it in assembly saving ~78 bytes.
I also removed unused softfloat functions to improve compile/link times.
f64_to_i64_r_minMag.ccan be removed sincedtollhas been implemented in assembly for example.