From 9441125d636dee246acf9cb6c8f264edda92c335 Mon Sep 17 00:00:00 2001 From: Reed Kotler Date: Wed, 31 Oct 2012 05:21:10 +0000 Subject: Implement ADJCALLSTACKUP and ADJCALLSTACKDOWN git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167107 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/Mips/Mips16FrameLowering.cpp | 6 ++++-- lib/Target/Mips/Mips16InstrInfo.cpp | 18 +++++++++++++++++- lib/Target/Mips/Mips16InstrInfo.h | 4 ++++ lib/Target/Mips/Mips16InstrInfo.td | 25 +++++++++++++++++++++++-- lib/Target/Mips/Mips16RegisterInfo.cpp | 20 +++++++++++++++++--- lib/Target/Mips/Mips16RegisterInfo.h | 3 ++- 6 files changed, 67 insertions(+), 9 deletions(-) (limited to 'lib/Target/Mips') diff --git a/lib/Target/Mips/Mips16FrameLowering.cpp b/lib/Target/Mips/Mips16FrameLowering.cpp index 74cffd202c..4e6b21feb5 100644 --- a/lib/Target/Mips/Mips16FrameLowering.cpp +++ b/lib/Target/Mips/Mips16FrameLowering.cpp @@ -115,8 +115,10 @@ bool Mips16FrameLowering::restoreCalleeSavedRegisters(MachineBasicBlock &MBB, bool Mips16FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const { - // FIXME: implement. - return true; + const MachineFrameInfo *MFI = MF.getFrameInfo(); + // Reserve call frame if the size of the maximum call frame fits into 15-bit + // immediate field and there are no variable sized objects on the stack. + return isInt<15>(MFI->getMaxCallFrameSize()) && !MFI->hasVarSizedObjects(); } void Mips16FrameLowering:: diff --git a/lib/Target/Mips/Mips16InstrInfo.cpp b/lib/Target/Mips/Mips16InstrInfo.cpp index fa0876a4eb..619646b317 100644 --- a/lib/Target/Mips/Mips16InstrInfo.cpp +++ b/lib/Target/Mips/Mips16InstrInfo.cpp @@ -26,7 +26,7 @@ using namespace llvm; Mips16InstrInfo::Mips16InstrInfo(MipsTargetMachine &tm) : MipsInstrInfo(tm, Mips::BimmX16), - RI(*tm.getSubtargetImpl()) {} + RI(*tm.getSubtargetImpl(), *this) {} const MipsRegisterInfo &Mips16InstrInfo::getRegisterInfo() const { return RI; @@ -160,6 +160,22 @@ unsigned Mips16InstrInfo::GetOppositeBranchOpc(unsigned Opc) const { return 0; } +/// Adjust SP by Amount bytes. +void Mips16InstrInfo::adjustStackPtr(unsigned SP, int64_t Amount, + MachineBasicBlock &MBB, + MachineBasicBlock::iterator I) const { + DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc(); + if (isInt<16>(Amount)) { + if (Amount < 0) + BuildMI(MBB, I, DL, get(Mips::SaveDecSpF16)). addImm(-Amount); + else if (Amount > 0) + BuildMI(MBB, I, DL, get(Mips::RestoreIncSpF16)).addImm(Amount); + } + else + // not implemented for large values yet + assert(false && "adjust stack pointer amount exceeded"); +} + unsigned Mips16InstrInfo::GetAnalyzableBrOpc(unsigned Opc) const { return (Opc == Mips::BeqzRxImmX16 || Opc == Mips::BimmX16 || Opc == Mips::BnezRxImmX16 || Opc == Mips::BteqzX16 || diff --git a/lib/Target/Mips/Mips16InstrInfo.h b/lib/Target/Mips/Mips16InstrInfo.h index 260c5b69b2..e06ccfe61c 100644 --- a/lib/Target/Mips/Mips16InstrInfo.h +++ b/lib/Target/Mips/Mips16InstrInfo.h @@ -64,6 +64,10 @@ public: virtual unsigned GetOppositeBranchOpc(unsigned Opc) const; + /// Adjust SP by Amount bytes. + void adjustStackPtr(unsigned SP, int64_t Amount, MachineBasicBlock &MBB, + MachineBasicBlock::iterator I) const; + private: virtual unsigned GetAnalyzableBrOpc(unsigned Opc) const; diff --git a/lib/Target/Mips/Mips16InstrInfo.td b/lib/Target/Mips/Mips16InstrInfo.td index 5f8af05f0c..5defc75ea6 100644 --- a/lib/Target/Mips/Mips16InstrInfo.td +++ b/lib/Target/Mips/Mips16InstrInfo.td @@ -686,7 +686,17 @@ def OrRxRxRy16: FRxRxRy16_ins<0b01101, "or", IIAlu>, ArithLogic16Defs<1>; let ra=1, s=0,s0=1,s1=1 in def RestoreRaF16: FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size), - "restore \t$$ra, $$s0, $$s1, $frame_size", [], IILoad >, MayLoad { + "restore\t$$ra, $$s0, $$s1, $frame_size", [], IILoad >, MayLoad { + let isCodeGenOnly = 1; +} + +// Use Restore to increment SP since SP is not a Mip 16 register, this +// is an easy way to do that which does not require a register. +// +let ra=0, s=0,s0=0,s1=0 in +def RestoreIncSpF16: + FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size), + "restore\t$frame_size", [], IILoad >, MayLoad { let isCodeGenOnly = 1; } @@ -700,7 +710,18 @@ def RestoreRaF16: let ra=1, s=1,s0=1,s1=1 in def SaveRaF16: FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size), - "save \t$$ra, $$s0, $$s1, $frame_size", [], IIStore >, MayStore { + "save\t$$ra, $$s0, $$s1, $frame_size", [], IIStore >, MayStore { + let isCodeGenOnly = 1; +} + +// +// Use Save to decrement the SP by a constant since SP is not +// a Mips16 register. +// +let ra=0, s=0,s0=0,s1=0 in +def SaveDecSpF16: + FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size), + "save\t$frame_size", [], IIStore >, MayStore { let isCodeGenOnly = 1; } // diff --git a/lib/Target/Mips/Mips16RegisterInfo.cpp b/lib/Target/Mips/Mips16RegisterInfo.cpp index 47a41d6fa8..d7397a32f0 100644 --- a/lib/Target/Mips/Mips16RegisterInfo.cpp +++ b/lib/Target/Mips/Mips16RegisterInfo.cpp @@ -12,6 +12,7 @@ //===----------------------------------------------------------------------===// #include "Mips16RegisterInfo.h" +#include "Mips16InstrInfo.h" #include "Mips.h" #include "MipsAnalyzeImmediate.h" #include "MipsInstrInfo.h" @@ -38,15 +39,28 @@ using namespace llvm; -Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST) - : MipsRegisterInfo(ST) {} +Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST, + const Mips16InstrInfo &I) + : MipsRegisterInfo(ST), TII(I) {} // This function eliminate ADJCALLSTACKDOWN, // ADJCALLSTACKUP pseudo instructions void Mips16RegisterInfo:: eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const { - // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions. + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); + + if (!TFI->hasReservedCallFrame(MF)) { + int64_t Amount = I->getOperand(0).getImm(); + + if (I->getOpcode() == Mips::ADJCALLSTACKDOWN) + Amount = -Amount; + + const Mips16InstrInfo *II = static_cast(&TII); + + II->adjustStackPtr(Mips::SP, Amount, MBB, I); + } + MBB.erase(I); } diff --git a/lib/Target/Mips/Mips16RegisterInfo.h b/lib/Target/Mips/Mips16RegisterInfo.h index c702a15f60..153def20d0 100644 --- a/lib/Target/Mips/Mips16RegisterInfo.h +++ b/lib/Target/Mips/Mips16RegisterInfo.h @@ -20,8 +20,9 @@ namespace llvm { class Mips16InstrInfo; class Mips16RegisterInfo : public MipsRegisterInfo { + const Mips16InstrInfo &TII; public: - Mips16RegisterInfo(const MipsSubtarget &Subtarget); + Mips16RegisterInfo(const MipsSubtarget &Subtarget, const Mips16InstrInfo &TII); void eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, -- cgit v1.2.3