[fpc-devel] threadvar implementation

["Vinzent Höfler"]

Michael Schnell <mschnell at lumino.de>:

> 2) ES: in my tests I modified ES in ASM code in a Delphi program and 
> caused it to crash by this, So the Delphi compiler seems to use it (for 
> whatever purpose)

No surprise, in any sane environment DS should be equal to ES. Most notorious instruction requiring that would be "movsb/w/d" which is using ES: for the target address. AFAIR a segment override is possible there, but only for the source address.


Vinzent.
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