diff options
| -rw-r--r-- | lib/Target/Mips/MipsTargetMachine.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Target/Mips/MipsTargetMachine.cpp b/lib/Target/Mips/MipsTargetMachine.cpp index 06f78e0..5046c1b 100644 --- a/lib/Target/Mips/MipsTargetMachine.cpp +++ b/lib/Target/Mips/MipsTargetMachine.cpp @@ -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>(); |