Teach machine cse to commute instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121903 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/machine-cse.ll b/test/CodeGen/X86/machine-cse.ll
index a8afdc8..e284776 100644
--- a/test/CodeGen/X86/machine-cse.ll
+++ b/test/CodeGen/X86/machine-cse.ll
@@ -37,3 +37,43 @@
declare void @bar(i32*)
declare fastcc i8* @foo(%struct.s2*) nounwind
+
+; rdar://8773371
+
+declare void @printf(...) nounwind
+
+define void @commute(i32 %test_case, i32 %scale) nounwind ssp {
+; CHECK: commute:
+entry:
+ switch i32 %test_case, label %sw.bb307 [
+ i32 1, label %sw.bb
+ i32 2, label %sw.bb
+ i32 3, label %sw.bb
+ ]
+
+sw.bb: ; preds = %entry, %entry, %entry
+ %mul = mul nsw i32 %test_case, 3
+ %mul20 = mul nsw i32 %mul, %scale
+ br i1 undef, label %if.end34, label %sw.bb307
+
+if.end34: ; preds = %sw.bb
+; CHECK: %if.end34
+; CHECK: imull
+; CHECK: leal
+; CHECK-NOT: imull
+ tail call void (...)* @printf(i32 %test_case, i32 %mul20) nounwind
+ %tmp = mul i32 %scale, %test_case
+ %tmp752 = mul i32 %tmp, 3
+ %tmp753 = zext i32 %tmp752 to i64
+ br label %bb.nph743.us
+
+for.body53.us: ; preds = %bb.nph743.us, %for.body53.us
+ %exitcond = icmp eq i64 undef, %tmp753
+ br i1 %exitcond, label %bb.nph743.us, label %for.body53.us
+
+bb.nph743.us: ; preds = %for.body53.us, %if.end34
+ br label %for.body53.us
+
+sw.bb307: ; preds = %sw.bb, %entry
+ ret void
+}