[llvm] r192124 - [mips] Disable tail merging when long branch pass is enabled.

[Akira Hatanaka]

Committed a test case in r192135.


On Mon, Oct 7, 2013 at 12:51 PM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:

> testcase?
>
> On 7 October 2013 15:13, Akira Hatanaka <ahatanaka at mips.com> wrote:
> > Author: ahatanak
> > Date: Mon Oct  7 14:13:53 2013
> > New Revision: 192124
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=192124&view=rev
> > Log:
> > [mips] Disable tail merging when long branch pass is enabled.
> >
> > Modified:
> >     llvm/trunk/lib/Target/Mips/MipsTargetMachine.cpp
> >
> > Modified: llvm/trunk/lib/Target/Mips/MipsTargetMachine.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsTargetMachine.cpp?rev=192124&r1=192123&r2=192124&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/Target/Mips/MipsTargetMachine.cpp (original)
> > +++ llvm/trunk/lib/Target/Mips/MipsTargetMachine.cpp Mon Oct  7 14:13:53
> 2013
> > @@ -135,7 +135,13 @@ namespace {
> >  class MipsPassConfig : public TargetPassConfig {
> >  public:
> >    MipsPassConfig(MipsTargetMachine *TM, PassManagerBase &PM)
> > -    : TargetPassConfig(TM, PM) {}
> > +    : TargetPassConfig(TM, PM) {
> > +    // The current implementation of long branch pass requires a scratch
> > +    // register ($at) to be available before branch instructions. Tail
> merging
> > +    // can break this requirement, so disable it when long branch pass
> is
> > +    // enabled.
> > +    EnableTailMerge = !getMipsSubtarget().enableLongBranchPass();
> > +  }
> >
> >    MipsTargetMachine &getMipsTargetMachine() const {
> >      return getTM<MipsTargetMachine>();
> >
> >
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