On May 21, 2005, at 11:48 AM, thome at lix dot polytechnique dot fr
wrote:
The code below is an attempt at having the macro add_ssaaaa from GNU
MP accepted by G++. I am casting the outputs of the asm statement to
unsigned int& (in GMP, USItype is unsigned int + attrib SI, which are
the
same on i386).
First, I'd like to be told if this is not a reasonable thing to do. I
think it is, but I'm not too sure.
The problem is that g++ 3.4.x produces wrong code at -O2 level for
this.
The asm produced has no trace of the two tests at the end (it must,
really). No warning is issued.
You are violating C++ aliasing rules.
You are accessing a long variable as an int.
Thanks,
Andrew Pinski
