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Except in asm-verbose mode, avoid printing labels for blocks that are

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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
This commit is contained in:
Dan Gohman
2009-03-30 22:55:17 +00:00
parent b23c232fc8
commit 80c93e7442
2 changed files with 15 additions and 1 deletions
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9
include/llvm/CodeGen/MachineBasicBlock.h
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@ -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); }