when i open /G7 option, compiler optimize float to long data cast instead of
calling _ftol2 function.But make some mistake when float = 0xffffffff; long
will be 0x80000000.
Assembly code:
00401032  mov         eax,dword ptr [yy]
00401035  mov         dword ptr [ebp-158h],eax
0040103B  mov         dword ptr [ebp-154h],0
00401045  fild        qword ptr [ebp-158h]
0040104B  mov         ecx,dword ptr [p]
0040104E  fmul        dword ptr [ecx]
00401050  fnstcw      word ptr [ebp-15Ah]
00401056  movzx       eax,word ptr [ebp-15Ah]
0040105D  or          ah,0Ch
00401060  mov         dword ptr [ebp-160h],eax
00401066  fldcw       word ptr [ebp-160h]
0040106C  fistp       dword ptr [ebp-164h]
00401072  fldcw       word ptr [ebp-15Ah]
00401078  mov         edx,dword ptr [ebp-164h]
0040107E  mov         dword ptr [xx],edx