Unit test for PR11950: LSR crash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153472 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/2012-03-26-constexpr.ll b/test/Transforms/LoopStrengthReduce/2012-03-26-constexpr.ll
new file mode 100644 (file)
index 0000000..c9b11a9
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/2012-03-26-constexpr.ll
@@ -0,0 +1,49 @@
+; RUN: opt < %s -loop-reduce -S
+; PR11950: isHighCostExpansion crashes on ConstExpr
+;
+; The crash happened during IVChain analysis (CollectChains). We don't
+; really care how LSR decides to transform this loop, so we don't
+; check it. As long as the analysis doesn't crash we're ok.
+target datalayout = "e-p:64:64:64-n32:64"
+
+%struct.this_structure_s.0.5 = type { [6144 x [8 x i32]], [6144 x [8 x i32]], [6147 x [4 x i32]], [8 x i32], [2 x i8*], [2 x i8*], [6144 x i8], [6144 x i32], [6144 x i32], [4 x [4 x i8]] }
+
+define internal fastcc void @someFunction(%struct.this_structure_s.0.5* nocapture %scratch, i32 %stage, i32 %cbSize) nounwind {
+entry:
+  %0 = getelementptr inbounds %struct.this_structure_s.0.5* %scratch, i32 0, i32 4, i32 %stage
+  %1 = load i8** %0, align 4
+  %2 = getelementptr inbounds %struct.this_structure_s.0.5* %scratch, i32 0, i32 5, i32 %stage
+  %3 = load i8** %2, align 4
+  %4 = getelementptr inbounds %struct.this_structure_s.0.5* %scratch, i32 0, i32 2, i32 0, i32 0
+  %tmp11 = shl i32 %stage, 1
+  %tmp1325 = or i32 %tmp11, 1
+  br label %__label_D_1608
+
+__label_D_1608:                                   ; preds = %__label_D_1608, %entry
+  %i.12 = phi i32 [ 0, %entry ], [ %10, %__label_D_1608 ]
+  %tmp = shl i32 %i.12, 2
+  %lvar_g.13 = getelementptr i32* %4, i32 %tmp
+  %tmp626 = or i32 %tmp, 1
+  %scevgep = getelementptr i32* %4, i32 %tmp626
+  %tmp727 = or i32 %tmp, 2
+  %scevgep8 = getelementptr i32* %4, i32 %tmp727
+  %tmp928 = or i32 %tmp, 3
+  %scevgep10 = getelementptr i32* %4, i32 %tmp928
+  %scevgep12 = getelementptr %struct.this_structure_s.0.5* %scratch, i32 0, i32 9, i32 %tmp11, i32 %i.12
+  %scevgep14 = getelementptr %struct.this_structure_s.0.5* %scratch, i32 0, i32 9, i32 %tmp1325, i32 %i.12
+  %5 = load i8* %scevgep12, align 1
+  %6 = sext i8 %5 to i32
+  %7 = load i8* %scevgep14, align 1
+  %8 = sext i8 %7 to i32
+  store i32 0, i32* %lvar_g.13, align 4
+  store i32 %8, i32* %scevgep, align 4
+  store i32 %6, i32* %scevgep8, align 4
+  %9 = add nsw i32 %8, %6
+  store i32 %9, i32* %scevgep10, align 4
+  %10 = add nsw i32 %i.12, 1
+  %exitcond = icmp eq i32 %10, 3
+  br i1 %exitcond, label %return, label %__label_D_1608
+
+return:                                           ; preds = %__label_D_1608
+  ret void
+}