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Update post-r203364 http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140303/207915.html

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and ranged for loops.

http://reviews.llvm.org/D3582



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207755 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yaron Keren 2014-05-01 12:33:26 +00:00
parent 3c5651a003
commit 3152576ea4
1 changed files with 4 additions and 8 deletions
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12
docs/ProgrammersManual.rst
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@ -1738,16 +1738,12 @@ chain of ``F``:
Function *F = ...; Function *F = ...;
for (Value::use_iterator i = F->use_begin(), e = F->use_end(); i != e; ++i) for (User *U : GV->users()) {
if (Instruction *Inst = dyn_cast<Instruction>(*i)) { if (Instruction *Inst = dyn_cast<Instruction>(U)) {
errs() << "F is used in instruction:\n"; errs() << "F is used in instruction:\n";
errs() << *Inst << "\n"; errs() << *Inst << "\n";
} }
Note that dereferencing a ``Value::use_iterator`` is not a very cheap operation.
Instead of performing ``*i`` above several times, consider doing it only once in
the loop body and reusing its result.
Alternatively, it's common to have an instance of the ``User`` Class (`doxygen Alternatively, it's common to have an instance of the ``User`` Class (`doxygen
<http://llvm.org/doxygen/classllvm_1_1User.html>`__) and need to know what <http://llvm.org/doxygen/classllvm_1_1User.html>`__) and need to know what
``Value``\ s are used by it. The list of all ``Value``\ s used by a ``User`` is ``Value``\ s are used by it. The list of all ``Value``\ s used by a ``User`` is
@ -1759,8 +1755,8 @@ instruction uses (that is, the operands of the particular ``Instruction``):
Instruction *pi = ...; Instruction *pi = ...;
for (User::op_iterator i = pi->op_begin(), e = pi->op_end(); i != e; ++i) { for (Use& U : pi->operands()) {
Value *v = *i; Value *v = U.get();
// ... // ...
} }