• "Eduardo Nunes" <edfpn hotmail.com> Oct 24 2002
• Jan Knepper <jan smartsoft.us> Oct 24 2002
• "Eduardo Nunes" <edfpn hotmail.com> Oct 24 2002
• "Walter" <walter digitalmars.com> Oct 24 2002

Walter,

The compiler generate bad code for CMatrix::rotate method, when used with
the switches,
-5 -o+all.
but correct code without -5 switch.
in attach is a example code.

btw, what is the pentium favored code guidelines used by the compiler,
besides code reordering?

Thanks,

Eduardo Nunes
ed sky3d.com

Eduardo Nunes wrote:

 The compiler generate bad code for CMatrix::rotate method, when used with
 the switches,
 -5 -o+all.
 but correct code without -5 switch.
 in attach is a example code.


Tried without the -o+all switch and with the -5 switch?

Jan

"Jan Knepper" <jan smartsoft.us> wrote in message
news:3DB7F2B4.F33A72D1 smartsoft.us...
 Eduardo Nunes wrote:

 The compiler generate bad code for CMatrix::rotate method, when used




 the switches,
 -5 -o+all.
 but correct code without -5 switch.
 in attach is a example code.


 Tried without the -o+all switch and with the -5 switch?

 Jan



sc bug2.cpp    (good code)
sc -5 bug2.cpp (good code)
sc -o+all bug2.cpp (good code)
sc -5 -o+all bug2.cpp (bad code)

from reading the generated code, the main difference and the crash point is:

  mov EAX,FLAT:_DATA[00h]
  mov EDX,FLAT:_DATA[04h]
  mov ECX,EAX
  mov 060h[EAX],EAX    <<< crash, EAX=0, EDX=0

the compiler version is 8.30,

Eduardo Nunes,
ed sky3d.com

Thanks, I'll take a look. -Walter