Hi, I want to dissemble the code and understand it. But it seems to hard to understand. Are there any compiler options which generate more information and help me to read the assembly code and compare it with the source code? Thanks, Peng On 9/28/07, Richard Li <richardpku@xxxxxxxxx> wrote: > I tested this code with "g++ -S -O1", and checked the generated > assembly code. I found G++ dropped the statement "e = d * 1" > completely, since "e" is a local variable and is assigned a value, but > never used later. > > If "e" is used later, G++ would optimize "e = d * 1 " as "e = d". > > On 9/29/07, Peng Yu <pengyu.ut@xxxxxxxxx> wrote: > > Hi, > > > > Can anybody let me know whether g++ will optimize for the following case? > > > > void f(double d) > > double e; > > ..... do something > > > > e = d * 1.;// will this be optimized as e = d; > > } > > > > Thanks, > > Peng > > >
