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Re: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
> In current state of x86_64 affairs, user can select -mfpmath=387 to
> instruct the compiler to use x87 FP instructions.
FWIW, I think -mfpmath=387 should actually give an error with -m64. I
want all traces of x87 to die a silent death. For x86 that's impossible,
we should not do anything to make it impossible for x86-64.
XFmode arguments use x87 registers on x86-64. It looks that x87 will
be with us for a long time...