From 54f8a9f54dfa39275f6fd277440b233891069283 Mon Sep 17 00:00:00 2001 From: Kalle Raiskila Date: Fri, 26 Aug 2011 10:14:56 +0000 Subject: [PATCH] Don't insert branch hint lables that are never used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138630 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/CellSPU/SPUFrameLowering.cpp | 12 ------------ lib/Target/CellSPU/SPUFrameLowering.h | 11 ----------- 2 files changed, 23 deletions(-) diff --git a/lib/Target/CellSPU/SPUFrameLowering.cpp b/lib/Target/CellSPU/SPUFrameLowering.cpp index 8e3186b599b..093f99f2871 100644 --- a/lib/Target/CellSPU/SPUFrameLowering.cpp +++ b/lib/Target/CellSPU/SPUFrameLowering.cpp @@ -181,18 +181,6 @@ void SPUFrameLowering::emitPrologue(MachineFunction &MF) const { MachineLocation FPSrc(MachineLocation::VirtualFP); Moves.push_back(MachineMove(ReadyLabel, FPDst, FPSrc)); } - } else { - // This is a leaf function -- insert a branch hint iff there are - // sufficient number instructions in the basic block. Note that - // this is just a best guess based on the basic block's size. - if (MBB.size() >= (unsigned) SPUFrameLowering::branchHintPenalty()) { - MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr(); - dl = MBBI->getDebugLoc(); - - // Insert terminator label - BuildMI(MBB, MBBI, dl, TII.get(SPU::PROLOG_LABEL)) - .addSym(MMI.getContext().CreateTempSymbol()); - } } } diff --git a/lib/Target/CellSPU/SPUFrameLowering.h b/lib/Target/CellSPU/SPUFrameLowering.h index 16789ddfc5e..b837f2cf94e 100644 --- a/lib/Target/CellSPU/SPUFrameLowering.h +++ b/lib/Target/CellSPU/SPUFrameLowering.h @@ -74,17 +74,6 @@ namespace llvm { static int FItoStackOffset(int frame_index) { return frame_index * stackSlotSize(); } - //! Number of instructions required to overcome hint-for-branch latency - /*! - HBR (hint-for-branch) instructions can be inserted when, for example, - we know that a given function is going to be called, such as printf(), - in the control flow graph. HBRs are only inserted if a sufficient number - of instructions occurs between the HBR and the target. Currently, HBRs - take 6 cycles, ergo, the magic number 6. - */ - static int branchHintPenalty() { - return 6; - } }; }