Add a lsr common loop invariant hoisting test case

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26827 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/loop-strength-reduce.ll b/test/CodeGen/X86/loop-strength-reduce.ll
new file mode 100644 (file)
index 0000000..5cf8d0a
--- /dev/null
+++ b/test/CodeGen/X86/loop-strength-reduce.ll
@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | llc -march=x86 -enable-x86-lsr | grep 'A(' | wc -l | grep 1
+;
+; Make sure the common loop invariant _A(reg) is hoisted up to preheader.
+
+%A = internal global [16 x [16 x int]] zeroinitializer, align 32
+
+void %test(int %row, int %N) {
+entry:
+       %N = cast int %N to uint
+       %tmp5 = setgt int %N, 0
+       br bool %tmp5, label %cond_true, label %return
+
+cond_true:
+       %indvar = phi uint [ 0, %entry ], [ %indvar.next, %cond_true ]
+       %i.0.0 = cast uint %indvar to int
+       %tmp2 = add int %i.0.0, 1
+       %tmp = getelementptr [16 x [16 x int]]* %A, int 0, int %row, int %tmp2
+       store int 4, int* %tmp
+       %tmp5 = add int %i.0.0, 2
+       %tmp7 = getelementptr [16 x [16 x int]]* %A, int 0, int %row, int %tmp5
+       store int 5, int* %tmp7
+       %indvar.next = add uint %indvar, 1
+       %exitcond = seteq uint %indvar.next, %N
+       br bool %exitcond, label %return, label %cond_true
+
+return:
+       ret void
+}