From 6e63e092365b763b65cc97a4d2c634443046c15a Mon Sep 17 00:00:00 2001
From: Dale Johannesen <dalej@apple.com>
Date: Fri, 12 Oct 2007 17:52:03 +0000
Subject: [PATCH] Implement i64->ppcf128 conversions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42919 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 3132d892fef..c8fd78f253d 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -6032,7 +6032,7 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
   case ISD::UINT_TO_FP: {
     bool isSigned = Node->getOpcode() == ISD::SINT_TO_FP;
     MVT::ValueType SrcVT = Node->getOperand(0).getValueType();
-    if (VT == MVT::ppcf128) {
+    if (VT == MVT::ppcf128 && SrcVT != MVT::i64) {
       static uint64_t zero = 0;
       if (isSigned) {
         Hi = LegalizeOp(DAG.getNode(ISD::SINT_TO_FP, MVT::f64, 
@@ -6044,6 +6044,7 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
                                     Node->getOperand(0)));
         Lo = DAG.getConstantFP(APFloat(APInt(64, 1, &zero)), MVT::f64);
         Hi = DAG.getNode(ISD::BUILD_PAIR, VT, Lo, Hi);
+        // X>=0 ? {(f64)x, 0} : {(f64)x, 0} + 2^32
         ExpandOp(DAG.getNode(ISD::SELECT_CC, MVT::ppcf128, Node->getOperand(0),
                              DAG.getConstant(0, MVT::i32), 
                              DAG.getNode(ISD::FADD, MVT::ppcf128, Hi,
@@ -6056,6 +6057,24 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
       }
       break;
     }
+    if (VT == MVT::ppcf128 && SrcVT == MVT::i64 && !isSigned) {
+      // si64->ppcf128 done by libcall, below
+      static uint64_t TwoE64[] = { 0x43f0000000000000LL, 0 };
+      ExpandOp(DAG.getNode(ISD::SINT_TO_FP, MVT::ppcf128, Node->getOperand(0)),
+               Lo, Hi);
+      Hi = DAG.getNode(ISD::BUILD_PAIR, VT, Lo, Hi);
+      // x>=0 ? (ppcf128)(i64)x : (ppcf128)(i64)x + 2^64
+      ExpandOp(DAG.getNode(ISD::SELECT_CC, MVT::ppcf128, Node->getOperand(0),
+                           DAG.getConstant(0, MVT::i64), 
+                           DAG.getNode(ISD::FADD, MVT::ppcf128, Hi,
+                                       DAG.getConstantFP(
+                                          APFloat(APInt(128, 2, TwoE64)),
+                                          MVT::ppcf128)),
+                           Hi,
+                           DAG.getCondCode(ISD::SETLT)),
+               Lo, Hi);
+      break;
+    }
     RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
     if (Node->getOperand(0).getValueType() == MVT::i64) {
       if (VT == MVT::f32)
-- 
2.34.1