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We expanded (neg x) to (minus const0 x) for MSA FP vectors, this is wrong because -0.0 is not 0 - 0.0. This causes some Python tests to fail when Python is built with MSA enabled. Use the bnegi.df instructions to simply reverse the sign bit instead. gcc/ChangeLog: * config/mips/mips-msa.md (elmsgnbit): New define_mode_attr. (neg<mode>2): Change the mode iterator from MSA to IMSA because in FP arithmetic we cannot use (0 - x) for -x. (neg<mode>2): New define_insn to implement FP vector negation, using a bnegi instruction to negate the sign bit.
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