From 8c0f244c3ed90a3f702bac09334cac2d3236aecb Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Fri, 12 Dec 2008 08:05:40 +0000
Subject: Don't make use of an illegal type (i64) when lowering f64 function
 arguments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60944 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Sparc/SparcISelLowering.cpp | 36 +++++++++++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index 7b7bf09..b1031b4 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -347,12 +347,37 @@ static SDValue LowerCALL(SDValue Op, SelectionDAG &DAG) {
         RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Val));
       }
       break;
-    case MVT::f64:
+    case MVT::f64: {
       ObjSize = 8;
-      // Otherwise, convert this to a FP value in int regs.
-      Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
-      // FALL THROUGH
-    case MVT::i64:
+      if (RegsToPass.size() >= 6) {
+        ValToStore = Val;    // Whole thing is passed in memory.
+        break;
+      }
+
+      // Break into top and bottom parts by storing to the stack and loading
+      // out the parts as integers.  Top part goes in a reg.
+      SDValue StackPtr = DAG.CreateStackTemporary(MVT::f64, MVT::i32);
+      SDValue Store = DAG.getStore(DAG.getEntryNode(), Val, StackPtr, NULL, 0);
+      // Sparc is big-endian, so the high part comes first.
+      SDValue Hi = DAG.getLoad(MVT::i32, Store, StackPtr, NULL, 0, 0);
+      // Increment the pointer to the other half.
+      StackPtr = DAG.getNode(ISD::ADD, StackPtr.getValueType(), StackPtr,
+                             DAG.getIntPtrConstant(4));
+      // Load the low part.
+      SDValue Lo = DAG.getLoad(MVT::i32, Store, StackPtr, NULL, 0, 0);
+
+      RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Hi));
+
+      if (RegsToPass.size() >= 6) {
+        ValToStore = Lo;
+        ArgOffset += 4;
+        ObjSize = 4;
+      } else {
+        RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Lo));
+      }
+      break;
+    }
+    case MVT::i64: {
       ObjSize = 8;
       if (RegsToPass.size() >= 6) {
         ValToStore = Val;    // Whole thing is passed in memory.
@@ -375,6 +400,7 @@ static SDValue LowerCALL(SDValue Op, SelectionDAG &DAG) {
       }
       break;
     }
+    }
 
     if (ValToStore.getNode()) {
       SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32);
-- 
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