From 80c93e7442f89f4a0565258c56dca446e1574f9b Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Mon, 30 Mar 2009 22:55:17 +0000 Subject: Except in asm-verbose mode, avoid printing labels for blocks that are only reachable via fall-through edges. This dramatically reduces the number of labels printed, and thus also the number of labels the assembler must parse and remember. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68073 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/MachineBasicBlock.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/llvm/CodeGen/MachineBasicBlock.h') diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h index 1ba7e798f8..f962273d2b 100644 --- a/include/llvm/CodeGen/MachineBasicBlock.h +++ b/include/llvm/CodeGen/MachineBasicBlock.h @@ -253,6 +253,15 @@ public: /// it returns end() iterator getFirstTerminator(); + /// isOnlyReachableViaFallthough - Return true if this basic block has + /// exactly one predecessor and the control transfer mechanism between + /// the predecessor and this block is a fall-through. + bool isOnlyReachableByFallthrough() const { + return !pred_empty() && + next(pred_begin()) == pred_end() && + (*pred_begin())->getFirstTerminator() == (*pred_begin())->end(); + } + void pop_front() { Insts.pop_front(); } void pop_back() { Insts.pop_back(); } void push_back(MachineInstr *MI) { Insts.push_back(MI); } -- cgit v1.2.3