From 6a234f07faf164e62f0799fa87f5742528cc043a Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Tue, 13 Apr 2010 22:03:22 +0000
Subject: [PATCH] Handle a v2f64 formal parameter that is split between
 registers and memory such that the entire second half is in memory.  Radar
 7855014.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101181 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp           | 20 +++++++++++++-------
 test/CodeGen/ARM/2010-04-13-v2f64SplitArg.ll |  7 +++++++
 2 files changed, 20 insertions(+), 7 deletions(-)
 create mode 100644 test/CodeGen/ARM/2010-04-13-v2f64SplitArg.ll

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 4fb95996877..cd0268d9f2d 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1613,10 +1613,8 @@ ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
 
   SDValue ArgValue2;
   if (NextVA.isMemLoc()) {
-    unsigned ArgSize = NextVA.getLocVT().getSizeInBits()/8;
     MachineFrameInfo *MFI = MF.getFrameInfo();
-    int FI = MFI->CreateFixedObject(ArgSize, NextVA.getLocMemOffset(),
-                                    true, false);
+    int FI = MFI->CreateFixedObject(4, NextVA.getLocMemOffset(), true, false);
 
     // Create load node to retrieve arguments from the stack.
     SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
@@ -1665,14 +1663,22 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
       if (VA.needsCustom()) {
         // f64 and vector types are split up into multiple registers or
         // combinations of registers and stack slots.
-        RegVT = MVT::i32;
-
         if (VA.getLocVT() == MVT::v2f64) {
           SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
                                                    Chain, DAG, dl);
           VA = ArgLocs[++i]; // skip ahead to next loc
-          SDValue ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
-                                                   Chain, DAG, dl);
+          SDValue ArgValue2;
+          if (VA.isMemLoc()) {
+            int FI = MFI->CreateFixedObject(8, VA.getLocMemOffset(),
+                                            true, false);
+            SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
+            ArgValue2 = DAG.getLoad(MVT::f64, dl, Chain, FIN,
+                                    PseudoSourceValue::getFixedStack(FI), 0,
+                                    false, false, 0);
+          } else {
+            ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
+                                             Chain, DAG, dl);
+          }
           ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
           ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
                                  ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
diff --git a/test/CodeGen/ARM/2010-04-13-v2f64SplitArg.ll b/test/CodeGen/ARM/2010-04-13-v2f64SplitArg.ll
new file mode 100644
index 00000000000..4f71b83b949
--- /dev/null
+++ b/test/CodeGen/ARM/2010-04-13-v2f64SplitArg.ll
@@ -0,0 +1,7 @@
+; RUN: llc < %s -mtriple=arm-apple-darwin -mcpu=cortex-a8
+; Radar 7855014
+
+define arm_apcscc void @test1(i32 %f0, i32 %f1, i32 %f2, <4 x i32> %f3) nounwind {
+entry:
+  unreachable
+}
-- 
2.34.1