6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 15:11:24 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
docs/ProgrammersManual.rst
View File

@ -1738,16 +1738,12 @@ chain of ``F``:
Function *F = ...;
for (Value::use_iterator i = F->use_begin(), e = F->use_end(); i != e; ++i)
if (Instruction *Inst = dyn_cast<Instruction>(*i)) {
for (User *U : GV->users()) {
if (Instruction *Inst = dyn_cast<Instruction>(U)) {
errs() << "F is used in instruction:\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
<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
@ -1759,8 +1755,8 @@ instruction uses (that is, the operands of the particular ``Instruction``):
Instruction *pi = ...;
for (User::op_iterator i = pi->op_begin(), e = pi->op_end(); i != e; ++i) {
Value *v = *i;
for (Use& U : pi->operands()) {
Value *v = U.get();
// ...
}