mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 12:50:30 +00:00
892202cb99
Summary: LoopRotate manually updates the DoomTree by iterating over all predecessors of a basic block and computing the Nearest Common Dominator. When a predecessor happens to be unreachable, `DT.findNearestCommonDominator` returns nullptr. This patch teaches LoopRotate to handle this case and fixes [[ https://bugs.llvm.org/show_bug.cgi?id=33701 | PR33701 ]]. In the future, LoopRotate should be taught to use the new incremental API for updating the DomTree. Reviewers: dberlin, davide, uabelho, grosser Subscribers: efriedma, mzolotukhin Differential Revision: https://reviews.llvm.org/D35074 llvm-svn: 307828
28 lines
770 B
LLVM
28 lines
770 B
LLVM
; RUN: opt < %s -loop-rotate -verify-dom-info -verify-loop-info -disable-output
|
|
|
|
define void @func() {
|
|
bb0:
|
|
br label %bb1
|
|
|
|
bb1: ; preds = %bb4, %bb0
|
|
%0 = phi i16 [ %2, %bb4 ], [ 0, %bb0 ]
|
|
%1 = icmp sle i16 %0, 2
|
|
br i1 %1, label %bb2, label %bb5
|
|
|
|
bb2: ; preds = %bb1
|
|
br i1 undef, label %bb6, label %bb4
|
|
|
|
bb3: ; No predecessors!
|
|
br label %bb6
|
|
|
|
bb4: ; preds = %bb2
|
|
%2 = add i16 undef, 1
|
|
br label %bb1
|
|
|
|
bb5: ; preds = %bb1
|
|
br label %bb6
|
|
|
|
bb6: ; preds = %bb5, %bb3, %bb2
|
|
unreachable
|
|
}
|