| View previous topic :: View next topic |
| Author |
Message |
Heimdall
Joined: 10 Nov 2005
Posts: 259
Location: Netherlands
|
 Posted: Thu Jan 08, 2009 6:43 am Post subject: Any benchmarks between LLVM vs GCC on Allegrex code? |
 |
|
There are lots of benchmarks about LLVM vs GCC but I haven't found any about the MIPS Allregrex code? did anyone tried to compare it?
I'd like to know which one generates "better" code. I really like LLVM and learning its code is simpler than GCC (IMHO).
It could give some people interest to improve the LLVM backend to support VFPU instructions. |
|
| Back to top |
|
 |
hlide
Joined: 10 Sep 2006
Posts: 750
|
| Posted: Fri Jan 09, 2009 11:35 pm Post subject: |
|
|
MIPS LLVM is still experimental and incomplete. I wouldn't expect too much about LLVM for MIPS.
But, yes, if it could be complete, it would be interesting to add VFPU. But i'm quite sceptical as it is a long time ago MIPS LLVM was started and it still doesn't seem to progress. |
|
| Back to top |
|
|
Heimdall
Joined: 10 Nov 2005
Posts: 259
Location: Netherlands
|
| Posted: Sat Jan 10, 2009 1:37 am Post subject: |
|
|
Yeap it is true, i only tried some simple bitcode:
| Code: | ; Declare the string constant as a global constant...
@.LC0 = internal constant [13 x i8] c"hello world\0A\00" ; [13 x i8]*
; External declaration of the puts function
declare i32 @puts(i8 *) ; i32(i8 *)*
; Definition of main function
define i32 @main() { ; i32()*
; Convert [13x i8 ]* to i8 *...
%cast210 = getelementptr [13 x i8 ]* @.LC0, i64 0, i64 0 ; i8 *
; Call puts function to write out the string to stdout...
call i32 @puts(i8 * %cast210) ; i32
ret i32 0
}
|
the just used the commands:
| Code: | llvm-as hello.ll
opt hello.bc -o hello.opt.bc
# doesn't give anything extra in optimization
llc -march=mips -mcpu=allegrex hello.bc
psp-gcc -c hello.s -o hello.o
# now i can link the object file with psp-gcc and run it on the PSP but this is no test at all...
|
|
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
