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CodeGen: Make MachineBasicBlock::back skip to the beginning of the last bundle.

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This makes front/back symmetric with begin/end, avoiding some confusion.
Added instr_front/instr_back for the old behavior, corresponding to
instr_begin/instr_end. Audited all three in-tree users of back(), all
of them look like they don't want to look inside bundles.

Fixes an assertion (PR19815) when generating debug info on mips, where a
delay slot was bundled at the end of a branch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209580 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-05-24 13:13:17 +00:00
parent 29f94c7201
commit 9d934aca34
4 changed files with 95 additions and 13 deletions
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13
include/llvm/CodeGen/MachineBasicBlock.h
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@@ -219,10 +219,15 @@ public:
unsigned size() const { return (unsigned)Insts.size(); }
bool empty() const { return Insts.empty(); }
MachineInstr& front() { return Insts.front(); }
MachineInstr& back() { return Insts.back(); }
const MachineInstr& front() const { return Insts.front(); }
const MachineInstr& back() const { return Insts.back(); }
MachineInstr &instr_front() { return Insts.front(); }
MachineInstr &instr_back() { return Insts.back(); }
const MachineInstr &instr_front() const { return Insts.front(); }
const MachineInstr &instr_back() const { return Insts.back(); }
MachineInstr &front() { return Insts.front(); }
MachineInstr &back() { return *--end(); }
const MachineInstr &front() const { return Insts.front(); }
const MachineInstr &back() const { return *--end(); }
instr_iterator instr_begin() { return Insts.begin(); }
const_instr_iterator instr_begin() const { return Insts.begin(); }