search for: targetmachineemittofile

Dimitri Tcaciuc wrote: > Is the llc/opt difference expected? Yes. "opt" runs the optimizers, which take LLVM IR as input and produce LLVM IR as output. "opt -O2 -debug-pass=Arguments" will show you a list of the individual optimizations (and analyses) that opt -O2 performs. It's possible to run them individually (opt -scalarrepl -instcombine) to create a list

...%rdi, -24(%rsp) movq %rsi, -16(%rsp) movq -24(%rsp), %rax movsd (%rax), %xmm0 subsd (%rsi), %xmm0 movsd %xmm0, -8(%rsp) mulsd %xmm0, %xmm0 ret .cfi_endproc This matches the results of LLVMCreateTargetMachine with CodeGenLevelAggressive followed by LLVMTargetMachineEmitToFile which I'm using. . Is the llc/opt difference expected? I'm a bit confused since I'd expect same -O level running the same optimization passes. I have to admit I'm not well versed in assembly but to me it looks like opt produces something that eliminates a bunch of stack loading ops....

...<anton at korobeynikov.info > wrote: > Most probably you need to properly specify the calling convention the > backend is using for calling the runtime functions. Thanks for the tip. Can you be more specific? Are you suggesting there is some config parameter I can set before running TargetMachineEmitToFile? Do you know what calling convention it is trying to use at the callsite? Perhaps I can simply select a different convention from this list for the implementation of udivti3? http://llvm.org/docs/LangRef.html#calling-conventions Or implement the > stub for udivti3 that performs the necessary a...

Most probably you need to properly specify the calling convention the backend is using for calling the runtime functions. Or implement the stub for udivti3 that performs the necessary argument lifting. I guess there is no standard ABI document describing the intended calling convention here, so I'd just do what mingw64 does here and make everything here compatible. On Thu, Apr 26, 2018 at

I'm trying to use LLVM to create compiler-rt.o on Windows. I use this command from the compiler-rt project: [nix-shell:~/downloads/llvm-project/compiler-rt]$ clang -nostdlib -S -emit-llvm lib/builtins/udivti3.c -g -target x86_64-windows -DCRT_HAS_128BIT The resulting LLVM IR is: ================================================================= ; ModuleID = 'lib/builtins/udivti3.c'