Check in LLVM r95781.

1 files changed, 30 insertions, 0 deletions

diff --git a/test/CodeGen/X86/loop-strength-reduce.ll b/test/CodeGen/X86/loop-strength-reduce.ll
new file mode 100644
index 0000000..4cb56ca
--- /dev/null
+++ b/test/CodeGen/X86/loop-strength-reduce.ll
@@ -0,0 +1,30 @@
+; RUN: llc < %s -march=x86 -relocation-model=static | \
+; RUN:   grep {A+} | count 2
+;
+; Make sure the common loop invariant A is not hoisted up to preheader,
+; since it can be subsumed into the addressing mode in all uses.
+
+@A = internal global [16 x [16 x i32]] zeroinitializer, align 32		; <[16 x [16 x i32]]*> [#uses=2]
+
+define void @test(i32 %row, i32 %N.in) nounwind {
+entry:
+	%N = bitcast i32 %N.in to i32		; <i32> [#uses=1]
+	%tmp5 = icmp sgt i32 %N.in, 0		; <i1> [#uses=1]
+	br i1 %tmp5, label %cond_true, label %return
+
+cond_true:		; preds = %cond_true, %entry
+	%indvar = phi i32 [ 0, %entry ], [ %indvar.next, %cond_true ]		; <i32> [#uses=2]
+	%i.0.0 = bitcast i32 %indvar to i32		; <i32> [#uses=2]
+	%tmp2 = add i32 %i.0.0, 1		; <i32> [#uses=1]
+	%tmp = getelementptr [16 x [16 x i32]]* @A, i32 0, i32 %row, i32 %tmp2		; <i32*> [#uses=1]
+	store i32 4, i32* %tmp
+	%tmp5.upgrd.1 = add i32 %i.0.0, 2		; <i32> [#uses=1]
+	%tmp7 = getelementptr [16 x [16 x i32]]* @A, i32 0, i32 %row, i32 %tmp5.upgrd.1		; <i32*> [#uses=1]
+	store i32 5, i32* %tmp7
+	%indvar.next = add i32 %indvar, 1		; <i32> [#uses=2]
+	%exitcond = icmp eq i32 %indvar.next, %N		; <i1> [#uses=1]
+	br i1 %exitcond, label %return, label %cond_true
+
+return:		; preds = %cond_true, %entry
+	ret void
+}