llvm dev - Jul 2013 - [LLVMdev] Clang/LLVM 3.3 unwanted attributes being added: NoFramePointerElim

Since updating to LLVM 3.3, the system is generating attributes such as:

attributes #0 = { nounwind "less-precise-fpmad"="false"
"no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf"="true"
"no-infs-fp-math"="false"
"no-nans-fp-math"="false"
"unsafe-fp-math"="false"
"use-soft-float"="false" }


I've tried to add options.

I've tracked the code to:

NoFramePointerElim

I've seen the description of:

./lib/Target/TargetMachine.cpp

 RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
  RESET_OPTION(NoFramePointerElimNonLeaf,
"no-frame-pointer-elim-non-leaf");
  RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
  RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
  RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
  RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
  RESET_OPTION(UseSoftFloat, "use-soft-float");
  RESET_OPTION(DisableTailCalls, "disable-tail-calls");

I cannot find the code or mechanism to turn off: NoFramePointerElim

No code generator has these specialized, so this is happening for all targets.

Any help?

With the new attribute system, there are some subtle differences in 
certain cases.

Some things are now are determined by clang and passed to llc whereas 
previously this only could happen if clang/llvm where run as one executable.

But now that same information can be added to attributes and passed to 
llc without you having to add command line parameters for those to llc.

Which compiler are you running?

You are running clang and llc separately?

On 07/24/2013 11:16 PM, Dan wrote:
> Since updating to LLVM 3.3, the system is generating attributes such as:
>
> attributes #0 = { nounwind "less-precise-fpmad"="false"
> "no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf"="true"
> "no-infs-fp-math"="false"
"no-nans-fp-math"="false"
> "unsafe-fp-math"="false"
"use-soft-float"="false" }
>
>
> I've tried to add options.
>
> I've tracked the code to:
>
> NoFramePointerElim
>
> I've seen the description of:
>
> ./lib/Target/TargetMachine.cpp
>
>   RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
>    RESET_OPTION(NoFramePointerElimNonLeaf,
"no-frame-pointer-elim-non-leaf");
>    RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
>    RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
>    RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
>    RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
>    RESET_OPTION(UseSoftFloat, "use-soft-float");
>    RESET_OPTION(DisableTailCalls, "disable-tail-calls");
>
> I cannot find the code or mechanism to turn off: NoFramePointerElim
>
> No code generator has these specialized, so this is happening for all
targets.
>
> Any help?
>

Maybe this would be interesting to you:

http://llvm.org/viewvc/llvm-project?view=revision&revision=187093

On 07/24/2013 11:16 PM, Dan wrote:
> Since updating to LLVM 3.3, the system is generating attributes such as:
>
> attributes #0 = { nounwind "less-precise-fpmad"="false"
> "no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf"="true"
> "no-infs-fp-math"="false"
"no-nans-fp-math"="false"
> "unsafe-fp-math"="false"
"use-soft-float"="false" }
>
>
> I've tried to add options.
>
> I've tracked the code to:
>
> NoFramePointerElim
>
> I've seen the description of:
>
> ./lib/Target/TargetMachine.cpp
>
>   RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
>    RESET_OPTION(NoFramePointerElimNonLeaf,
"no-frame-pointer-elim-non-leaf");
>    RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
>    RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
>    RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
>    RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
>    RESET_OPTION(UseSoftFloat, "use-soft-float");
>    RESET_OPTION(DisableTailCalls, "disable-tail-calls");
>
> I cannot find the code or mechanism to turn off: NoFramePointerElim
>
> No code generator has these specialized, so this is happening for all
targets.
>
> Any help?
>