Refactor code. Fix a potential missing check. Teach isIdentical() about tLDRpci_pic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86330 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/Thumb/machine-licm.ll b/test/CodeGen/Thumb/machine-licm.ll
new file mode 100644
index 0000000..dae1412
--- /dev/null
+++ b/test/CodeGen/Thumb/machine-licm.ll
@@ -0,0 +1,41 @@
+; RUN: llc < %s -mtriple=thumb-apple-darwin -relocation-model=pic -disable-fp-elim | FileCheck %s
+; rdar://7353541
+; rdar://7354376
+
+; The generated code is no where near ideal. It's not recognizing the two
+; constantpool entries being loaded can be merged into one.
+
+@GV = external global i32 ; <i32*> [#uses=2]
+
+define arm_apcscc void @t(i32* nocapture %vals, i32 %c) nounwind {
+entry:
+; CHECK: t:
+ %0 = icmp eq i32 %c, 0 ; <i1> [#uses=1]
+ br i1 %0, label %return, label %bb.nph
+
+bb.nph: ; preds = %entry
+; CHECK: BB#1
+; CHECK: ldr.n r2, LCPI1_0
+; CHECK: add r2, pc
+; CHECK: ldr r{{[0-9]+}}, [r2]
+; CHECK: LBB1_2
+; CHECK: LCPI1_0:
+; CHECK-NOT: LCPI1_1:
+; CHECK: .section
+ %.pre = load i32* @GV, align 4 ; <i32> [#uses=1]
+ br label %bb
+
+bb: ; preds = %bb, %bb.nph
+ %1 = phi i32 [ %.pre, %bb.nph ], [ %3, %bb ] ; <i32> [#uses=1]
+ %i.03 = phi i32 [ 0, %bb.nph ], [ %4, %bb ] ; <i32> [#uses=2]
+ %scevgep = getelementptr i32* %vals, i32 %i.03 ; <i32*> [#uses=1]
+ %2 = load i32* %scevgep, align 4 ; <i32> [#uses=1]
+ %3 = add nsw i32 %1, %2 ; <i32> [#uses=2]
+ store i32 %3, i32* @GV, align 4
+ %4 = add i32 %i.03, 1 ; <i32> [#uses=2]
+ %exitcond = icmp eq i32 %4, %c ; <i1> [#uses=1]
+ br i1 %exitcond, label %return, label %bb
+
+return: ; preds = %bb, %entry
+ ret void
+}