From 7e31fe7e20d75a0629092edab0844c45ed79eb82 Mon Sep 17 00:00:00 2001
From: Quentin Colombet <qcolombet@apple.com>
Date: Fri, 29 May 2015 01:40:00 +0000
Subject: [PATCH] Add a test for the MachineCopyPropagation change landed in
 r238518.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238537 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/machine-cp.ll | 55 ++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/test/CodeGen/X86/machine-cp.ll b/test/CodeGen/X86/machine-cp.ll
index 0006b6ea713..aaed0f0a23d 100644
--- a/test/CodeGen/X86/machine-cp.ll
+++ b/test/CodeGen/X86/machine-cp.ll
@@ -58,3 +58,58 @@ while.end:                                        ; preds = %while.body, %entry
   %t = trunc i64 %a.addr.0.lcssa to i32
   ret i32 %t
 }
+
+; Check that copy propagation does not kill thing like:
+; dst = copy src <-- do not kill that.
+; ... = op1 dst<undef>
+; ... = op2 dst <-- this is used here.
+;
+; CHECK-LABEL: foo:
+; CHECK: psllw $7,
+; CHECK: psllw $7,
+; CHECK-NEXT: pand
+; CHECK-NEXT: pcmpgtb 
+; CHECK-NEXT: pand %xmm{{[0-9]+}}, [[SRC:%xmm[0-9]+]]
+; Machine propagation used to delete the first copy as the
+; first few uses were <undef>.
+; CHECK-NEXT: movdqa [[SRC]], [[CPY1:%xmm[0-9]+]]
+; CHECK-NEXT: movdqa [[SRC]], [[CPY2:%xmm[0-9]+]]
+; CHECK-NEXT: punpckhbw [[SRC]],
+; Check that CPY1 is not redefined.
+; CHECK-NOT: , [[CPY1]]
+; undef use, we do not care.
+; CHECK: punpcklwd [[CPY1]],
+; Check that CPY1 is not redefined.
+; CHECK-NOT: , [[CPY1]]
+; CHECK: punpcklbw [[CPY2]], [[CPY2]]
+; CHECK-NEXT: punpckhwd [[CPY2]], [[CPY2]]
+; CHECK-NEXT pslld $31, [[CPY2]]
+; Check that CPY1 is not redefined.
+; CHECK-NOT: , [[CPY1]]
+; CHECK: punpcklbw [[CPY1]], [[CPY1]]
+; CHECK-NEXT: punpcklwd [[CPY1]], [[CPY1]]
+; CHECK-NEXT pslld $31, [[CPY1]]
+define <16 x float> @foo(<16 x float> %x) {
+bb:
+  %v3 = icmp slt <16 x i32> undef, zeroinitializer
+  %v14 = zext <16 x i1> %v3 to <16 x i32>
+  %v16 = fcmp olt <16 x float> %x, zeroinitializer
+  %v17 = sext <16 x i1> %v16 to <16 x i32>
+  %v18 = zext <16 x i1> %v16 to <16 x i32>
+  %v19 = xor <16 x i32> %v14, %v18
+  %v20 = or <16 x i32> %v17, undef
+  %v21 = fptosi <16 x float> %x to <16 x i32>
+  %v22 = sitofp <16 x i32> %v21 to <16 x float>
+  %v69 = fcmp ogt <16 x float> %v22, zeroinitializer
+  %v75 = and <16 x i1> %v69, %v3
+  %v77 = bitcast <16 x float> %v22 to <16 x i32>
+  %v79 = sext <16 x i1> %v75 to <16 x i32>
+  %v80 = and <16 x i32> undef, %v79
+  %v81 = xor <16 x i32> %v77, %v80
+  %v82 = and <16 x i32> undef, %v81
+  %v83 = xor <16 x i32> %v19, %v82
+  %v84 = and <16 x i32> %v83, %v20
+  %v85 = xor <16 x i32> %v19, %v84
+  %v86 = bitcast <16 x i32> %v85 to <16 x float>
+  ret <16 x float> %v86
+}
-- 
2.34.1