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Re: gcc-4.1 with fastmath
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From: |
Roland McGrath |
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Subject: |
Re: gcc-4.1 with fastmath |
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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).