From 9280c37786b7656eca9199eaff9a0b746dae701b Mon Sep 17 00:00:00 2001 From: dim Date: Thu, 25 May 2017 23:14:51 +0000 Subject: [PATCH] Pull in r303257 from upstream llvm trunk (by Krzysztof Parzyszek) [PPC] Properly update register save area offsets The variables MinGPR/MinG8R were not updated properly when resetting the offsets, which in the included testcase lead to saving the CR register in the same location as R30. This fixes another issue reported in PR26519. Differential Revision: https://reviews.llvm.org/D33017 Reported by: Mark Millard PR: 206990 MFC after: 3 days --- .../lib/Target/PowerPC/PPCFrameLowering.cpp | 23 +++++++++++-------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp b/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp index 2c4b17a8878d..f9ea8711cdb0 100644 --- a/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp +++ b/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp @@ -1775,32 +1775,37 @@ void PPCFrameLowering::processFunctionBeforeFrameFinalized(MachineFunction &MF, // Check whether the frame pointer register is allocated. If so, make sure it // is spilled to the correct offset. if (needsFP(MF)) { - HasGPSaveArea = true; - int FI = PFI->getFramePointerSaveIndex(); assert(FI && "No Frame Pointer Save Slot!"); - MFI.setObjectOffset(FI, LowerBound + MFI.getObjectOffset(FI)); + // FP is R31/X31, so no need to update MinGPR/MinG8R. + HasGPSaveArea = true; } if (PFI->usesPICBase()) { - HasGPSaveArea = true; - int FI = PFI->getPICBasePointerSaveIndex(); assert(FI && "No PIC Base Pointer Save Slot!"); - MFI.setObjectOffset(FI, LowerBound + MFI.getObjectOffset(FI)); + + MinGPR = std::min(MinGPR, PPC::R30); + HasGPSaveArea = true; } const PPCRegisterInfo *RegInfo = static_cast(Subtarget.getRegisterInfo()); if (RegInfo->hasBasePointer(MF)) { - HasGPSaveArea = true; - int FI = PFI->getBasePointerSaveIndex(); assert(FI && "No Base Pointer Save Slot!"); - MFI.setObjectOffset(FI, LowerBound + MFI.getObjectOffset(FI)); + + unsigned BP = RegInfo->getBaseRegister(MF); + if (PPC::G8RCRegClass.contains(BP)) { + MinG8R = std::min(MinG8R, BP); + HasG8SaveArea = true; + } else if (PPC::GPRCRegClass.contains(BP)) { + MinGPR = std::min(MinGPR, BP); + HasGPSaveArea = true; + } } // General register save area starts right below the Floating-point