PR10386: Don't try to split an edge from an indirectbr.

llvm-svn: 135534

1 files changed, 52 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopStrengthReduce/2011-07-19-CritEdgeBreakCrash.ll b/llvm/test/Transforms/LoopStrengthReduce/2011-07-19-CritEdgeBreakCrash.ll
new file mode 100644
index 00000000000..b9bd7c9bf4a
--- /dev/null
+++ b/llvm/test/Transforms/LoopStrengthReduce/2011-07-19-CritEdgeBreakCrash.ll
@@ -0,0 +1,52 @@
+; ModuleID = '<stdin>'
+; RUN: opt < %s -loop-reduce -S | FileCheck %s
+; PR10386
+
+declare i1 @foo()
+declare i8* @bar(i8*,i8*,i8*,i8*)
+
+define void @f(i64* %a,i64* %b,i64* %c,i64* %d,i64* %e,i64* %f,i64* %g) nounwind uwtable {
+entry:
+  br label %b_throw.preheader
+
+D_BREAK_LBL:                                      ; preds = %indirectgoto
+  call i1 @foo()
+  br label %indirectgoto
+
+H_CONST_LBL:                                      ; preds = %indirectgoto
+  call i1 @foo()
+  br label %body_failed
+
+H_MPZ_LBL:                                        ; preds = %indirectgoto
+  %boo3 = call i1 @foo()
+  br i1 %boo3, label %body_failed, label %while.cond.i
+
+while.cond.i:                                     ; preds = %while.body.i15795, %if.then.i15791
+  %phi = phi i64 [ %tmp20916, %while.body.i15795 ], [ 0, %H_MPZ_LBL ]
+  %tmp20916 = add i64 %phi, 1
+  %incdec.ptr.i15793 = getelementptr i64* %pc.0.lcssa.i1610719352, i64 %tmp20916
+  %boo2 = call i1 @foo()
+  br i1 %boo2, label %indirectgoto, label %while.body.i15795
+
+while.body.i15795:                                ; preds = %while.cond.i
+  %tmp20.i = load i64* %incdec.ptr.i15793, align 8
+  %boo1 = call i1 @foo()
+  br i1 %boo1, label %while.cond.i, label %body_failed
+
+b_throw.preheader:                                ; preds = %body_failed, %entry
+  call i1 @foo()
+  br label %indirectgoto
+
+body_failed:
+  %pc.0.lcssa.i1610719364 = phi i64* [ %pc.0.lcssa.i1610719352, %indirectgoto ], [ %pc.0.lcssa.i1610719352, %H_MPZ_LBL ], [ %b, %H_CONST_LBL ], [ %pc.0.lcssa.i1610719352, %while.body.i15795 ]
+  call i1 @foo()
+  br label %b_throw.preheader
+
+indirectgoto:
+  %pc.0.lcssa.i1610719352 = phi i64* [ %pc.0.lcssa.i1610719352, %D_BREAK_LBL ], [ %a, %b_throw.preheader ], [ %d, %while.cond.i ]
+  %p = call i8* @bar(i8* blockaddress(@f, %D_BREAK_LBL), i8* blockaddress(@f, %H_CONST_LBL), i8* blockaddress(@f, %H_MPZ_LBL), i8* blockaddress(@f, %body_failed) )
+  indirectbr i8* %p, [label %D_BREAK_LBL, label %H_CONST_LBL, label %H_MPZ_LBL, label %body_failed]
+}
+
+; CHECK: %p = call i8* @bar(i8* blockaddress(@f, %D_BREAK_LBL), i8* blockaddress(@f, %H_CONST_LBL), i8* blockaddress(@f, %H_MPZ_LBL), i8* blockaddress(@f, %body_failed))
+; CHECK: indirectbr i8* %p, [label %D_BREAK_LBL, label %H_CONST_LBL, label %H_MPZ_LBL, label %body_failed]