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![gbeauche](/assets/img/avatar_default.png)
could have caused some rounding thus alterations to integer registers on context switches when lfd/stfd instructions were used. e.g. cygwin compilers defaulted to i686 code generation and exhibed this behaviour, you could also see this behavior with -march=i586 -mtune=pentiumpro. GCC is perfectly right to do those optimizations.