6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-15 05:24:01 +00:00
Code Issues Projects Releases Wiki Activity

Updated comments as suggested by Rafael. Thanks.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211268 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dinesh Dwivedi
2014-06-19 14:11:53 +00:00
parent 85386a3de9
commit dc9bdcc2cb
1 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Transforms/Scalar/JumpThreading.cpp
View File

@ -158,7 +158,13 @@ bool JumpThreading::runOnFunction(Function &F) {
TLI = &getAnalysis<TargetLibraryInfo>(); TLI = &getAnalysis<TargetLibraryInfo>();
LVI = &getAnalysis<LazyValueInfo>(); LVI = &getAnalysis<LazyValueInfo>();
// Remove unreachable blocks from function as they may result in infinite loop. // Remove unreachable blocks from function as they may result in infinite
// loop. We do threading if we found something profitable. Jump threading a
// branch can create other opportunities. If these opportunities form a cycle
// i.e. if any jump treading is undoing previous threading in the path, then
// we will loop forever. We take care of this issue by not jump threading for
// back edges. This works for normal cases but not for unreachable blocks as
// they may have cycle with no back edge.
removeUnreachableBlocks(F); removeUnreachableBlocks(F);
FindLoopHeaders(F); FindLoopHeaders(F);