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Use bidirectional bundle flags to simplify important functions.

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The bundle_iterator::operator++ function now doesn't need to dig out the
basic block and check against end(). It can use the isBundledWithSucc()
flag to find the last bundled instruction safely.

Similarly, MachineInstr::isBundled() no longer needs to look at
iterators etc. It only has to look at flags.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170473 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-12-18 23:21:49 +00:00
parent 1a3150098c
commit 2e4b639790
3 changed files with 9 additions and 17 deletions
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include/llvm/CodeGen/MachineBasicBlock.h
+6 -6
View File
@@ -146,11 +146,11 @@ public:
bundle_iterator(IterTy mii) : MII(mii) {}
bundle_iterator(Ty &mi) : MII(mi) {
assert(!mi.isInsideBundle() &&
assert(!mi.isBundledWithPred() &&
"It's not legal to initialize bundle_iterator with a bundled MI");
}
bundle_iterator(Ty *mi) : MII(mi) {
assert((!mi || !mi->isInsideBundle()) &&
assert((!mi || !mi->isBundledWithPred()) &&
"It's not legal to initialize bundle_iterator with a bundled MI");
}
// Template allows conversion from const to nonconst.
@@ -174,13 +174,13 @@ public:
// Increment and decrement operators...
bundle_iterator &operator--() { // predecrement - Back up
do --MII;
while (MII->isInsideBundle());
while (MII->isBundledWithPred());
return *this;
}
bundle_iterator &operator++() { // preincrement - Advance
IterTy E = MII->getParent()->instr_end();
do ++MII;
while (MII != E && MII->isInsideBundle());
while (MII->isBundledWithSucc())
++MII;
++MII;
return *this;
}
bundle_iterator operator--(int) { // postdecrement operators...