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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2013-10-07 19:13:53 +00:00
parent 51a8280fbb
commit c746503425
1 changed files with 7 additions and 1 deletions
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8
lib/Target/Mips/MipsTargetMachine.cpp
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@ -135,7 +135,13 @@ namespace {
class MipsPassConfig : public TargetPassConfig { class MipsPassConfig : public TargetPassConfig {
public: public:
MipsPassConfig(MipsTargetMachine *TM, PassManagerBase &PM) 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 { MipsTargetMachine &getMipsTargetMachine() const {
return getTM<MipsTargetMachine>(); return getTM<MipsTargetMachine>();