From 0ebc9616b4045284168a2be5a8162502eecc8e5e Mon Sep 17 00:00:00 2001 From: Sanjoy Das Date: Thu, 16 Jun 2016 18:54:06 +0000 Subject: NFC; refactor getFrameIndexReferenceFromSP Summary: ... into getFrameIndexReferencePreferSP. This change folds the fail-then-retry logic into getFrameIndexReferencePreferSP. There is a non-functional but behaviorial change in WinException -- earlier if `getFrameIndexReferenceFromSP` failed we'd trip an assert, but now we'll silently use the (wrong) offset from the base pointer. I could not write the assert I'd like to write ("FrameReg == StackRegister", like I've done in X86FrameLowering) since there is no easy way to get to the stack register from WinException (happy to be proven wrong here). One solution to this is to add a `bool OnlyStackPointer` parameter to `getFrameIndexReferenceFromSP` that asserts if it could not satisfy its promise of returning an offset from a stack pointer, but that seems overkill. Reviewers: rnk Subscribers: sanjoy, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D21427 llvm-svn: 272938 --- llvm/lib/CodeGen/PrologEpilogInserter.cpp | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) (limited to 'llvm/lib/CodeGen/PrologEpilogInserter.cpp') diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index 33935c42..ca30af9 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -1094,17 +1094,8 @@ void PEI::replaceFrameIndices(MachineBasicBlock *BB, MachineFunction &Fn, "DBG_VALUE machine instruction"); unsigned Reg; MachineOperand &Offset = MI->getOperand(i + 1); - int refOffset; - // First try to get an offset relative to SP. If that's not - // possible use whatever the target usually uses. - auto SPOffset = TFI->getFrameIndexReferenceFromSP( - Fn, MI->getOperand(i).getIndex(), Reg, /*AllowSPAdjustment*/ false); - if (SPOffset) - refOffset = *SPOffset; - else - refOffset = TFI->getFrameIndexReference( - Fn, MI->getOperand(i).getIndex(), Reg); - + int refOffset = TFI->getFrameIndexReferencePreferSP( + Fn, MI->getOperand(i).getIndex(), Reg, /*IgnoreSPUpdates*/ false); Offset.setImm(Offset.getImm() + refOffset); MI->getOperand(i).ChangeToRegister(Reg, false /*isDef*/); continue; -- cgit v1.1