Added a late machine instruction copy propagation pass. This catches

[oota-llvm.git] / test / CodeGen / X86 / machine-cp.ll

diff --git a/test/CodeGen/X86/machine-cp.ll b/test/CodeGen/X86/machine-cp.ll
new file mode 100644 (file)
index 0000000..54fa01c
--- /dev/null
+++ b/test/CodeGen/X86/machine-cp.ll
@@ -0,0 +1,36 @@
+; RUN: llc -mtriple=x86_64-apple-macosx -mcpu=nocona < %s | FileCheck %s
+
+; After tail duplication, two copies in an early exit BB can be cancelled out.
+; rdar://10640363
+define i32 @t1(i32 %a, i32 %b) nounwind  {
+entry:
+; CHECK: t1:
+; CHECK: jne
+  %cmp1 = icmp eq i32 %b, 0
+  br i1 %cmp1, label %while.end, label %while.body
+
+; CHECK: BB
+; CHECK-NOT: mov
+; CHECK: ret
+
+while.body:                                       ; preds = %entry, %while.body
+  %a.addr.03 = phi i32 [ %b.addr.02, %while.body ], [ %a, %entry ]
+  %b.addr.02 = phi i32 [ %rem, %while.body ], [ %b, %entry ]
+  %rem = srem i32 %a.addr.03, %b.addr.02
+  %cmp = icmp eq i32 %rem, 0
+  br i1 %cmp, label %while.end, label %while.body
+
+while.end:                                        ; preds = %while.body, %entry
+  %a.addr.0.lcssa = phi i32 [ %a, %entry ], [ %b.addr.02, %while.body ]
+  ret i32 %a.addr.0.lcssa
+}
+
+; Two movdqa (from phi-elimination) in the entry BB cancels out.
+; rdar://10428165
+define <8 x i16> @t2(<8 x i16> %T0, <8 x i16> %T1) nounwind readnone {
+entry:
+; CHECK: t2:
+; CHECK-NOT: movdqa
+  %tmp8 = shufflevector <8 x i16> %T0, <8 x i16> %T1, <8 x i32> < i32 undef, i32 undef, i32 7, i32 2, i32 8, i32 undef, i32 undef , i32 undef >
+  ret <8 x i16> %tmp8
+}