Unit test for r146950: LSR postinc expansion, PR11571.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146951 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/2011-12-19-PostincQuadratic.ll b/test/Transforms/LoopStrengthReduce/2011-12-19-PostincQuadratic.ll
new file mode 100644 (file)
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+++ b/test/Transforms/LoopStrengthReduce/2011-12-19-PostincQuadratic.ll
@@ -0,0 +1,39 @@
+; RUN: opt -loop-reduce -S < %s | FileCheck %s
+;
+; PR11571: handle a postinc user outside of for.body7 that requires
+; recursive expansion of a quadratic recurrence within for.body7. LSR
+; needs to forget that for.body7 is a postinc loop during expansion.
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
+target triple = "i386-unknown-freebsd10.0"
+
+@b = external global [121 x i32]
+
+; CHECK: @vb
+;   Outer recurrence:
+; CHECK: %lsr.iv1 = phi [121 x i32]*
+;   Inner recurrence:
+; CHECK: %lsr.iv = phi i32
+;   Outer step (relative to inner recurrence):
+; CHECK: %scevgep = getelementptr i1* %{{.*}}, i32 %lsr.iv
+;   Outer use:
+; CHECK: %lsr.iv3 = phi [121 x i32]* [ %lsr.iv1, %for.body43.preheader ]
+define void @vb() nounwind {
+for.cond.preheader:
+  br label %for.body7
+
+for.body7:
+  %indvars.iv77 = phi i32 [ %indvars.iv.next78, %for.body7 ], [ 1, %for.cond.preheader ]
+  %bf.072 = phi i32 [ %t1, %for.body7 ], [ 0, %for.cond.preheader ]
+  %t1 = add i32 %bf.072, %indvars.iv77
+  %indvars.iv.next78 = add i32 %indvars.iv77, 1
+  br i1 undef, label %for.body43, label %for.body7
+
+for.body43:
+  %bf.459 = phi i32 [ %inc44, %for.body43 ], [ %t1, %for.body7 ]
+  %inc44 = add nsw i32 %bf.459, 1
+  %arrayidx45 = getelementptr inbounds [121 x i32]* @b, i32 0, i32 %bf.459
+  %t2 = load i32* %arrayidx45, align 4
+  br label %for.body43
+}
+