From cc4f38bc280cd013b786f1a2d757f02fd8f71b50 Mon Sep 17 00:00:00 2001
From: Jiangning Liu <jiangning.liu@arm.com>
Date: Tue, 3 Jun 2014 03:25:09 +0000
Subject: [PATCH] [AArch64] Correctly deal with VPR stack parameter passing.

llvm-svn: 210067
---
 llvm/lib/Target/AArch64/AArch64ISelLowering.cpp | 13 ++++++++++---
 llvm/test/CodeGen/AArch64/arm64-aapcs.ll        |  8 ++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 7bb07cc..4bc22c3 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -1711,7 +1711,9 @@ SDValue AArch64TargetLowering::LowerFormalArguments(
       InVals.push_back(FrameIdxN);
 
       continue;
-    } if (VA.isRegLoc()) {
+    }
+    
+    if (VA.isRegLoc()) {
       // Arguments stored in registers.
       EVT RegVT = VA.getLocVT();
 
@@ -1772,25 +1774,30 @@ SDValue AArch64TargetLowering::LowerFormalArguments(
       SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
       SDValue ArgValue;
 
+      // For NON_EXTLOAD, generic code in getLoad assert(ValVT == MemVT)
       ISD::LoadExtType ExtType = ISD::NON_EXTLOAD;
+      MVT MemVT = VA.getValVT();
+
       switch (VA.getLocInfo()) {
       default:
         break;
       case CCValAssign::SExt:
         ExtType = ISD::SEXTLOAD;
+        MemVT = VA.getLocVT();
         break;
       case CCValAssign::ZExt:
         ExtType = ISD::ZEXTLOAD;
+        MemVT = VA.getLocVT();
         break;
       case CCValAssign::AExt:
         ExtType = ISD::EXTLOAD;
+        MemVT = VA.getLocVT();
         break;
       }
 
       ArgValue = DAG.getExtLoad(ExtType, DL, VA.getValVT(), Chain, FIN,
                                 MachinePointerInfo::getFixedStack(FI),
-                                VA.getLocVT(),
-                                false, false, false, 0);
+                                MemVT, false, false, false, 0);
 
       InVals.push_back(ArgValue);
     }
diff --git a/llvm/test/CodeGen/AArch64/arm64-aapcs.ll b/llvm/test/CodeGen/AArch64/arm64-aapcs.ll
index b713f0d..ccf1371 100644
--- a/llvm/test/CodeGen/AArch64/arm64-aapcs.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-aapcs.ll
@@ -101,3 +101,11 @@ define fp128 @test_fp128([8 x float] %arg0, fp128 %arg1) {
 ; CHECK: ldr {{q[0-9]+}}, [sp]
   ret fp128 %arg1
 }
+
+; Check if VPR can be correctly pass by stack.
+define <2 x double> @test_vreg_stack([8 x <2 x double>], <2 x double> %varg_stack) {
+entry:
+; CHECK-LABEL: test_vreg_stack:
+; CHECK: ldr {{q[0-9]+}}, [sp]
+  ret <2 x double> %varg_stack;
+}
-- 
2.7.4