From d9e10d51fabbc030b146259f6b242ce34aa266ce Mon Sep 17 00:00:00 2001 From: Hal Finkel Date: Tue, 19 Mar 2013 08:09:38 +0000 Subject: Don't reserve R31 on PPC64 unless the frame pointer is needed llvm-svn: 177379 --- llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'llvm/lib/Target') diff --git a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp index e2c7221be37..74261a3a504 100644 --- a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp @@ -117,16 +117,15 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const { } // On PPC64, r13 is the thread pointer. Never allocate this register. - // Note that this is over conservative, as it also prevents allocation of R31 - // when the FP is not needed. if (Subtarget.isPPC64()) { Reserved.set(PPC::R13); - Reserved.set(PPC::R31); Reserved.set(PPC::X0); Reserved.set(PPC::X1); Reserved.set(PPC::X13); - Reserved.set(PPC::X31); + + if (PPCFI->needsFP(MF)) + Reserved.set(PPC::X31); // The 64-bit SVR4 ABI reserves r2 for the TOC pointer. if (Subtarget.isSVR4ABI()) { -- cgit v1.2.3