fistp stores integer p or rounded float?

[daydreamer]

?..or i need to set fp flags right to get integer part?

[qWord]

i need to set fp flags right to get integer part?

yes, you need to set the rounding mode. The default value (FINIT) is "round to nearest". There is also the SSE3 instruction FISTTP, which always truncates (ignores the current rounding mode). Furthermore, using cvttsd2si or cvttss2si (SSE2) might be also an option.