[LLVMdev] llvmc for PIC16

Sanjiv Gupta
Fri, 05 Jun 2009 06:51:14 -0000

> I'll be happy to answer any further questions you may have, feel free
to e-mail
> me directly (though right now our mail server is down)
>
The salient features that we want to have in the driver are:
1. llvm-ld will be used as "The Optimizer".
2. If the user has specified to generate the final executable, then
llvm-ld should run on all the .bc files generated by clang and create a
single optimized .bc file for further tools.
3. -Wo <options> - pass optimizations to the llvm-ld
4. mcc16 -Wl <options> - pass options to native linker.
5. mcc16 -Wa <options> - pass options to native assembler.

Here are some example command lines and sample command invocations as to
what should be done.

$ mcc16 -S foo.c
// [clang-cc foo.c] -> foo.bc
// [llvm-ld foo.bc] -> foo.opt.bc
// [llc foo.opt.bc] -> foo.s

$ mcc16 -S foo.c bar.c
// [clang-cc foo.c] -> foo.bc
// [llvm-ld foo.bc] -> foo.opt.bc
// [llc foo.opt.bc] -> foo.s
// [clang-cc bar.c] -> bar.bc
// [llvm-ld bar.bc] -> bar.opt.bc
// [llc bar.opt.bc] -> bar.s

** Use of -g causes llvm-ld to run with -disable-opt
$ mcc16 -S -g foo.c
// [clang-cc foo.c] -> foo.bc
// [llvm-ld -disable-opt foo.bc] -> foo.opt.bc
// [llc foo.opt.bc] -> foo.s

** -I is passed to clang-cc, -pre-RA-sched=list-burr to llc.
$ mcc16 -S -g -I ../include -pre-RA-sched=list-burr foo.c
// [clang-cc -I ../include foo.c] -> foo.bc
// [llvm-ld -disable-opt foo.bc] -> foo.opt.bc
// [llc -pre-RA-sched=list-burr foo.opt.bc] -> foo.s

** -Wo passes options to llvm-ld
$ mcc16 -Wo=opt1,opt2 -S -I ../include -pre-RA-sched=list-burr foo.c
// [clang-cc -I ../include foo.c] -> foo.bc
// [llvm-ld -opt1 -opt2 foo.bc] -> foo.opt.bc
// [llc -pre-RA-sched=list-burr foo.opt.bc] -> foo.s

** -Wa passes options to native as.
$ mcc16 -c foo.c -Wa=opt1
// [clang-cc foo.c] -> foo.bc
// [llvm-ld foo.bc] -> foo.opt.bc
// [llc foo.opt.bc] -> foo.s
// [native-as -opt1 foo.s] -> foo.o

$ mcc16 -Wo=opt1 -Wl=opt2 -Wa=opt3 foo.c bar.c
// [clang-cc foo.c] -> foo.bc
// [clang-cc bar.c] -> bar.bc
// [llvm-ld -opt1 foo.bc bar.bc] -> a.out.bc
// [llc a.out.bc] -> a.out.s
// [native-as -opt3 a.out.s] -> a.out.o
// [native-ld -opt2 a.out.o] -> a.out

Is this achievable by a tablegen based driver ?

- Sanjiv