WIP: Provide ispc implementation of __gnu_*_ieee. #2410
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During codegeneration, LLVM lowers single<->half precison float casts to these calls. It happens for platform without hardware support for such instructions. E.g., for x86 it means for CPU without FP16C extension.
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During codegeneration, LLVM lowers single<->half precison float casts to these calls. It happens for platform without hardware support for such instructions. E.g., for x86 it means for CPU without FP16C extension.