Avoid partial CPSR dependency from loop backedges. rdar://10357570

[oota-llvm.git] / test / CodeGen / ARM / avoid-cpsr-rmw.ll

diff --git a/test/CodeGen/ARM/avoid-cpsr-rmw.ll b/test/CodeGen/ARM/avoid-cpsr-rmw.ll
index 92aff7007f23cfd269ef5fd09c7feb219accc5f4..877ec1806261113d730bc8b81f81b97e3f8b56c2 100644 (file)
--- a/test/CodeGen/ARM/avoid-cpsr-rmw.ll
+++ b/test/CodeGen/ARM/avoid-cpsr-rmw.ll
@@ -3,9 +3,9 @@
 ; dependency) when it isn't dependent on last CPSR defining instruction.
 ; rdar://8928208
 
-define i32 @t(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone {
+define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone {
  entry:
-; CHECK: t:
+; CHECK: t1:
 ; CHECK: muls [[REG:(r[0-9]+)]], r2, r3
 ; CHECK-NEXT: mul  [[REG2:(r[0-9]+)]], r0, r1
 ; CHECK-NEXT: muls r0, [[REG2]], [[REG]]
@@ -14,3 +14,37 @@ define i32 @t(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone {
   %2 = mul nsw i32 %0, %1
   ret i32 %2
 }
+
+; Avoid partial CPSR dependency via loop backedge.
+; rdar://10357570
+define void @t2(i32* nocapture %ptr1, i32* %ptr2, i32 %c) nounwind {
+entry:
+; CHECK: t2:
+  %tobool7 = icmp eq i32* %ptr2, null
+  br i1 %tobool7, label %while.end, label %while.body
+
+while.body:
+; CHECK: while.body
+; CHECK: mul r{{[0-9]+}}
+; CHECK-NOT: muls
+  %ptr1.addr.09 = phi i32* [ %add.ptr, %while.body ], [ %ptr1, %entry ]
+  %ptr2.addr.08 = phi i32* [ %incdec.ptr, %while.body ], [ %ptr2, %entry ]
+  %0 = load i32* %ptr1.addr.09, align 4
+  %arrayidx1 = getelementptr inbounds i32* %ptr1.addr.09, i32 1
+  %1 = load i32* %arrayidx1, align 4
+  %arrayidx3 = getelementptr inbounds i32* %ptr1.addr.09, i32 2
+  %2 = load i32* %arrayidx3, align 4
+  %arrayidx4 = getelementptr inbounds i32* %ptr1.addr.09, i32 3
+  %3 = load i32* %arrayidx4, align 4
+  %add.ptr = getelementptr inbounds i32* %ptr1.addr.09, i32 4
+  %mul = mul i32 %1, %0
+  %mul5 = mul i32 %mul, %2
+  %mul6 = mul i32 %mul5, %3
+  store i32 %mul6, i32* %ptr2.addr.08, align 4
+  %incdec.ptr = getelementptr inbounds i32* %ptr2.addr.08, i32 -1
+  %tobool = icmp eq i32* %incdec.ptr, null
+  br i1 %tobool, label %while.end, label %while.body
+
+while.end:
+  ret void
+}