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DavidLoftus
54b7f1345a
Addresses part of issue raised in #7159 by implementing float.negate builtin for FloatLiteralValues The following code now compiles: ``` let a: f64 = -1.0; ``` To achieve this I switch the mantissa from being unsigned to signed. Lexed literals within source file will still always be unsigned, however it is now possible to create negative FloatLiteralValue constants. Main non-local changes this causes is: - All llvm::APInt parsing / printing calls flipped isSigned param - Zero extension replaced with sign extension - getActiveBits() replaced with getSignificantBits() for min bit width calculation