diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2015-08-07 23:01:33 +0000 |
---|---|---|
committer | Dimitry Andric <dim@FreeBSD.org> | 2015-08-07 23:01:33 +0000 |
commit | ee8648bdac07986a0f1ec897b02ec82a2f144d46 (patch) | |
tree | 52d1861acda1205241ee35a94aa63129c604d469 /lib/CodeGen/TargetFrameLoweringImpl.cpp | |
parent | 1a82d4c088707c791c792f6822f611b47a12bdfe (diff) | |
download | src-ee8648bdac07986a0f1ec897b02ec82a2f144d46.tar.gz src-ee8648bdac07986a0f1ec897b02ec82a2f144d46.zip |
Vendor import of llvm trunk r242221:vendor/llvm/llvm-trunk-r242221
Notes
Notes:
svn path=/vendor/llvm/dist/; revision=286425
svn path=/vendor/llvm/llvm-trunk-r242221/; revision=286426; tag=vendor/llvm/llvm-trunk-r242221
Diffstat (limited to 'lib/CodeGen/TargetFrameLoweringImpl.cpp')
-rw-r--r-- | lib/CodeGen/TargetFrameLoweringImpl.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/CodeGen/TargetFrameLoweringImpl.cpp b/lib/CodeGen/TargetFrameLoweringImpl.cpp index 56383247eadb..f3cccd82a5c5 100644 --- a/lib/CodeGen/TargetFrameLoweringImpl.cpp +++ b/lib/CodeGen/TargetFrameLoweringImpl.cpp @@ -11,9 +11,12 @@ // //===----------------------------------------------------------------------===// +#include "llvm/ADT/BitVector.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineModuleInfo.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/IR/Function.h" #include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetSubtargetInfo.h" @@ -54,3 +57,30 @@ bool TargetFrameLowering::needsFrameIndexResolution( const MachineFunction &MF) const { return MF.getFrameInfo()->hasStackObjects(); } + +void TargetFrameLowering::determineCalleeSaves(MachineFunction &MF, + BitVector &SavedRegs, + RegScavenger *RS) const { + // Get the callee saved register list... + const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo(); + const MCPhysReg *CSRegs = TRI.getCalleeSavedRegs(&MF); + + // Early exit if there are no callee saved registers. + if (!CSRegs || CSRegs[0] == 0) + return; + + SavedRegs.resize(TRI.getNumRegs()); + + // In Naked functions we aren't going to save any registers. + if (MF.getFunction()->hasFnAttribute(Attribute::Naked)) + return; + + // Functions which call __builtin_unwind_init get all their registers saved. + bool CallsUnwindInit = MF.getMMI().callsUnwindInit(); + const MachineRegisterInfo &MRI = MF.getRegInfo(); + for (unsigned i = 0; CSRegs[i]; ++i) { + unsigned Reg = CSRegs[i]; + if (CallsUnwindInit || MRI.isPhysRegModified(Reg)) + SavedRegs.set(Reg); + } +} |