fst to tword

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Kicer

Joined: 30 Apr 2005
Posts: 34
Location: Poland

Kicer 01 Jun 2005, 12:58

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: 8135
Location: Kraków, Poland

Tomasz Grysztar 01 Jun 2005, 13:05

Only FSTP instruction has the 80-bit operand variant.

01 Jun 2005, 13:05

Kicer

Joined: 30 Apr 2005
Posts: 34
Location: Poland

Kicer 01 Jun 2005, 13:23

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 01 Jun 2005, 14:48

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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