fst to tword

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Kicer

Joined: 30 Apr 2005
Posts: 34
Location: Poland

Kicer

why I can load fpu register from tword data but I can't store to it??
example:

Code:

fld [ds:real10]
fst [ds:real10]

real10 dt 0e0

first line is compiling second isn't

01 Jun 2005, 12:58

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 7883
Location: Kraków, Poland

Tomasz Grysztar

Only FSTP instruction has the 80-bit operand variant.

01 Jun 2005, 13:05

Kicer

Joined: 30 Apr 2005
Posts: 34
Location: Poland

Kicer

I would never thougt.......
btw it's funny that fpu can't save register without poping it....

01 Jun 2005, 13:23

Matrix

Joined: 04 Sep 2004
Posts: 1166
Location: Overflow

Matrix

Hy Kicer
well these fpus are funny things, fpu is independent from cpu,
the only thing you can access directly is the status in accumulator.

if you can time the codes well,
cpu and fpu instructions can run in parallel/simultaniously.

01 Jun 2005, 14:48

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