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Re: gcc-4.1 with fastmath

From: Roland McGrath
Subject: Re: gcc-4.1 with fastmath
Date: Tue, 5 Dec 2006 00:18:52 -0800 (PST)

gnumach doesn't support newer fpu state for mmx/xmm et al.
would need new thread state flavor for "fpx" or whatever we call it.
cf linux asm/user.h  user_i387_struct vs  user_fxsr_struct
former is what mach can handle.  need to handle latter in ctx sw + user
thread state flavor, then enable cpu support bits (cr4 bit i think).

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