From 6c43f35d740ccd1d746be90d98ee11f8829fe543 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 17 May 2006 18:16:39 +0000
Subject: [PATCH] Fixed a LowerCallTo and LowerArguments bug. They were
 introducing illegal VBIT_VECTOR nodes. There were some confusion about the
 semantics of getPackedTypeBreakdown(). e.g. for <4 x f32> it returns 1 and
 v4f32, not 4, and f32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28352 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 39 +++++++++++++------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index bddaa904aa4..e1d4d8e1e6d 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -2455,20 +2455,25 @@ TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
 
         // Figure out if there is a Packed type corresponding to this Vector
         // type.  If so, convert to the packed type.
+        bool Supported = false;
         MVT::ValueType TVT = MVT::getVectorType(getValueType(EltTy), NumElems);
-        if (TVT != MVT::Other && isTypeLegal(TVT)) {
+        if (TVT != MVT::Other) {
           SDOperand N = SDOperand(Result, i++);
           // Handle copies from generic vectors to registers.
           MVT::ValueType PTyElementVT, PTyLegalElementVT;
           unsigned NE = getPackedTypeBreakdown(PTy, PTyElementVT,
                                                PTyLegalElementVT);
-          // Insert a VBIT_CONVERT of the FORMAL_ARGUMENTS to a
-          // "N x PTyElementVT" MVT::Vector type.
-          N = DAG.getNode(ISD::VBIT_CONVERT, MVT::Vector, N,
-                          DAG.getConstant(NE, MVT::i32), 
-                          DAG.getValueType(PTyElementVT));
-          Ops.push_back(N);
-        } else {
+          // FIXME: handle NE > 1 cases.
+          if (NE == 1) {
+            N = DAG.getNode(ISD::VBIT_CONVERT, MVT::Vector, N,
+                            DAG.getConstant(NumElems, MVT::i32), 
+                            DAG.getValueType(getValueType(EltTy)));
+            Ops.push_back(N);
+            Supported = true;
+          }
+        }
+
+        if (!Supported) {
           assert(0 && "Don't support illegal by-val vector arguments yet!");
           abort();
         }
@@ -2546,15 +2551,25 @@ TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
         
         // Figure out if there is a Packed type corresponding to this Vector
         // type.  If so, convert to the packed type.
+        bool Supported = false;
         MVT::ValueType TVT = MVT::getVectorType(getValueType(EltTy), NumElems);
-        if (TVT != MVT::Other && isTypeLegal(TVT)) {
+        if (TVT != MVT::Other) {
           // Handle copies from generic vectors to registers.
           MVT::ValueType PTyElementVT, PTyLegalElementVT;
           unsigned NE = getPackedTypeBreakdown(PTy, PTyElementVT,
                                                PTyLegalElementVT);
-          // Insert a VBIT_CONVERT of the MVT::Vector type to the packed type.
-          Ops.push_back(DAG.getNode(ISD::VBIT_CONVERT, TVT, Op));
-        } else {
+          // FIXME: handle NE > 1 cases.
+          if (NE == 1) {
+            // Insert a VBIT_CONVERT of the MVT::Vector type to the packed type.
+            Op = DAG.getNode(ISD::VBIT_CONVERT, MVT::Vector, Op,
+                             DAG.getConstant(NumElems, MVT::i32), 
+                             DAG.getValueType(getValueType(EltTy)));
+            Ops.push_back(Op);
+            Supported = true;
+          }
+        }
+
+        if (!Supported) {
           assert(0 && "Don't support illegal by-val vector call args yet!");
           abort();
         }