llvm dev - Jan 2011 - [LLVMdev] -ffixed option in llvm-gcc

Hi
  I am trying to register shadow a global variable using -ffixed option 
in llvm-gcc. I am able to accomplish this using gcc however llvm-gcc 
seems to ignore this option and generate code using the register.

command line:
 >gcc -Wall -m64 -O3 -pthread -ftls-model=initial-exec -ffixed-r12 
test.c -o test
 >objdump -d ./test | grep r12


 >llvm-gcc -Wall -m64 -O3 -pthread -ftls-model=initial-exec -ffixed-r12 
test.c -o test
 >objdump -d ./test | grep r12
....
...  //uses r12 register

I was wondering if "-ffixed" option is not supported by llvm-gcc. If
so
I was wondering what is the best approach to register shadow a global 
variable in llvm.

Best,
--Hari

On Jan 21, 2011, at 2:56 PM, Hari Pyla wrote:
> I was wondering if "-ffixed" option is not supported by llvm-gcc.
If so
> I was wondering what is the best approach to register shadow a global 
> variable in llvm.
LLVM doesn't support -ffixed and global register variables.

/jakob

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