Avoid inserting noop's in the middle of a loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60141 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 0 deletions

diff --git a/test/CodeGen/X86/avoid-loop-align.ll b/test/CodeGen/X86/avoid-loop-align.ll
new file mode 100644
index 0000000000..dfc58181d9
--- /dev/null
+++ b/test/CodeGen/X86/avoid-loop-align.ll
@@ -0,0 +1,32 @@
+; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | grep align | count 1
+
+@A = common global [100 x i32] zeroinitializer, align 32		; <[100 x i32]*> [#uses=1]
+
+define i8* @test(i8* %Q, i32* %L) nounwind {
+entry:
+	%tmp = tail call i32 (...)* @foo() nounwind		; <i32> [#uses=2]
+	%tmp1 = inttoptr i32 %tmp to i8*		; <i8*> [#uses=1]
+	br label %bb1
+
+bb:		; preds = %bb1, %bb1
+	%indvar.next = add i32 %P.0.rec, 1		; <i32> [#uses=1]
+	br label %bb1
+
+bb1:		; preds = %bb, %entry
+	%P.0.rec = phi i32 [ 0, %entry ], [ %indvar.next, %bb ]		; <i32> [#uses=2]
+	%P.0 = getelementptr i8* %tmp1, i32 %P.0.rec		; <i8*> [#uses=3]
+	%tmp2 = load i8* %P.0, align 1		; <i8> [#uses=1]
+	switch i8 %tmp2, label %bb4 [
+		i8 12, label %bb
+		i8 42, label %bb
+	]
+
+bb4:		; preds = %bb1
+	%tmp3 = ptrtoint i8* %P.0 to i32		; <i32> [#uses=1]
+	%tmp4 = sub i32 %tmp3, %tmp		; <i32> [#uses=1]
+	%tmp5 = getelementptr [100 x i32]* @A, i32 0, i32 %tmp4		; <i32*> [#uses=1]
+	store i32 4, i32* %tmp5, align 4
+	ret i8* %P.0
+}
+
+declare i32 @foo(...)