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x87 status word size

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x87 status word size

Subject: x87 status word size
From: Jonas Maebe <email@hidden>
Date: Mon, 15 Jun 2009 20:11:20 +0200

Hello,

Why is the x87 tag word field (__fpu_ftw) in _STRUCT_X86_FLOAT_STATE32 in osfmk/mach/i386/_structs.h only 8 bits? The hardware tag word is 16 bit. I guess it "overflows" into the next "__fpu_rsrv1" field when saving/restoring the fpu state, so in practice it probably doesn't really matter as long as you don't directly access it (but I would like to do so, to reset the fpu state within a signal handler).

Thanks,


Jonas

(I asked this question 2 months back on darwin-dev, but didn't get a reply; maybe someone here knows)

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