Generating Assembly Files Using GCC

Generating Assembly Files Using GCC

[rajkrishna]

We are using powerpc-motorola-elf-as.exe to generate assembly file from a
"*cpp*" file. If there is an if condition for eg *if(x==0)* , and when we
generate the assembly code for the condition ,"*bne*" and "*beq*" are
generated whereas only *beq *(branch equal) is the only code what we are
expecting as per the source code. Is there are any gcc switches which can be
used to customize the assembly code generation?



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Re: Generating Assembly Files Using GCC

[Ángel González]

On 06/01/14 12:42, rajkrishna wrote:
> We are using powerpc-motorola-elf-as.exe to generate assembly file from a
> "*cpp*" file. If there is an if condition for eg *if(x==0)* , and when we
> generate the assembly code for the condition ,"*bne*" and "*beq*" are
> generated whereas only *beq *(branch equal) is the only code what we are
> expecting as per the source code. Is there are any gcc switches which can be
> used to customize the assembly code generation?
You should provide a bigger example. Make a toy program with the if, 
show the
original code, the generated assembly (only relevant lines needed, of 
course)
and the expected one.

What optimization level (-O<n>) are you using? That's the most important 
switch
changing the code generation (there are also switches to enable/disable 
individual
optimizations, but -On works with groups of them). Please provide the 
command
you are using to generate the assembly.

Re: Generating Assembly Files Using GCC

[rajkrishna]

Hi Ángel González,
      Im not using any switches im directly using
powerpc-motorola-elf-as.exe to generate the assembly file..
     The syntax im using :-powerpc-motorola-elf-as.exe -o inst_abc.o
inst_abc.s_




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Re: Generating Assembly Files Using GCC

[Ángel González]

On 09/01/14 15:31, rajkrishna wrote:
> Hi Ángel González,
>        Im not using any switches im directly using
> powerpc-motorola-elf-as.exe to generate the assembly file..
>       The syntax im using :-powerpc-motorola-elf-as.exe -o inst_abc.o
> inst_abc.s_
What source code* are you feeding, what are you expecting and what is 
actually produced?


* provide just a reduced test case, not your full application :)