From 9eec66e604f09ed9779bc438d0dc4fa9d24db44c Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 15 Apr 2011 01:31:00 +0000
Subject: [PATCH] Fix another fcopysign lowering bug. If src is f64 and
 destination is f32, don't forget to right shift the source by 32 first.
 rdar://9287902

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129556 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp |  5 ++++-
 test/CodeGen/ARM/fcopysign.ll      | 25 +++++++++++++++++++++----
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index d5f65c7abff..ded62eb3838 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -2952,7 +2952,10 @@ SDValue ARMTargetLowering::LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const {
         Tmp1 = DAG.getNode(ARMISD::VSHL, dl, OpVT,
                            DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp1),
                            DAG.getConstant(32, MVT::i32));
-    }
+    } else if (VT == MVT::f32)
+      Tmp1 = DAG.getNode(ARMISD::VSHRu, dl, MVT::v1i64,
+                         DAG.getNode(ISD::BITCAST, dl, MVT::v1i64, Tmp1),
+                         DAG.getConstant(32, MVT::i32));
     Tmp0 = DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp0);
     Tmp1 = DAG.getNode(ISD::BITCAST, dl, OpVT, Tmp1);
 
diff --git a/test/CodeGen/ARM/fcopysign.ll b/test/CodeGen/ARM/fcopysign.ll
index 9e94e3976ce..adf989ad915 100644
--- a/test/CodeGen/ARM/fcopysign.ll
+++ b/test/CodeGen/ARM/fcopysign.ll
@@ -44,15 +44,32 @@ entry:
 define i32 @test4() ssp {
 entry:
 ; SOFT: test4:
-; SOFT: vcvt.f32.f64 s0, 
-; SOFT: vmov.i32 [[REG4:(d[0-9]+)]], #0x80000000
-; SOFT: vbic [[REG5:(d[0-9]+)]], d0, [[REG4]]
-; SOFT: vorr d0, [[REG4]], [[REG5]]
+; SOFT: vmov.f64 [[REG4:(d[0-9]+)]], #1.000000e+00
+; SOFT: vcvt.f32.f64 s0, [[REG4]]
+; SOFT: vshr.u64 [[REG4]], [[REG4]], #32
+; SOFT: vmov.i32 [[REG5:(d[0-9]+)]], #0x80000000
+; SOFT: vbsl [[REG5]], [[REG4]], d0
   %call80 = tail call double @copysign(double 1.000000e+00, double undef)
   %conv81 = fptrunc double %call80 to float
   %tmp88 = bitcast float %conv81 to i32
   ret i32 %tmp88
 }
 
+; rdar://9287902
+define float @test5() nounwind {
+entry:
+; SOFT: test5:
+; SOFT: vmov.i32 [[REG6:(d[0-9]+)]], #0x80000000
+; SOFT: vmov [[REG7:(d[0-9]+)]], r0, r1
+; SOFT: vshr.u64 [[REG7]], [[REG7]], #32
+; SOFT: vbsl [[REG6]], [[REG7]], 
+  %0 = tail call double (...)* @bar() nounwind
+  %1 = fptrunc double %0 to float
+  %2 = tail call float @copysignf(float 5.000000e-01, float %1) nounwind readnone
+  %3 = fadd float %1, %2
+  ret float %3
+}
+
+declare double @bar(...)
 declare double @copysign(double, double) nounwind
 declare float @copysignf(float, float) nounwind
-- 
2.11.0