From ee9ca07e7f88ba100c56e2171009e158352026c8 Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Wed, 15 Sep 2010 01:52:33 +0000
Subject: [PATCH] Use float64 instead of int64 vector elements for NEON
 vget_low and vget_high functions, since int64 is not a legal type and using
 it leads to inefficient code.  PR8036.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113919 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/NeonEmitter.cpp | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/utils/TableGen/NeonEmitter.cpp b/utils/TableGen/NeonEmitter.cpp
index 5db1564229d..f3707f2b229 100644
--- a/utils/TableGen/NeonEmitter.cpp
+++ b/utils/TableGen/NeonEmitter.cpp
@@ -552,10 +552,14 @@ static std::string GenOpString(OpKind op, const std::string &proto,
   }
   
   std::string ts = TypeString(proto[0], typestr);
-  std::string s = ts + " r; r";
-  
-  if (structTypes)
-    s += ".val";
+  std::string s;
+  if (op == OpHi || op == OpLo) {
+    s = "union { " + ts + " r; double d; } u; u.d";
+  } else {
+    s = ts + " r; r";
+    if (structTypes)
+      s += ".val";
+  }
   
   s += " = ";
 
@@ -631,10 +635,10 @@ static std::string GenOpString(OpKind op, const std::string &proto,
     s += ", (__neon_int64x1_t)" + b + ", 0, 1)";
     break;
   case OpHi:
-    s += "(__neon_int64x1_t)(((__neon_int64x2_t)" + a + ")[1])";
+    s += "(((__neon_float64x2_t)" + a + ")[1])";
     break;
   case OpLo:
-    s += "(__neon_int64x1_t)(((__neon_int64x2_t)" + a + ")[0])";
+    s += "(((__neon_float64x2_t)" + a + ")[0])";
     break;
   case OpDup:
     s += Duplicate(nElts << (int)quad, typestr, a);
@@ -671,7 +675,10 @@ static std::string GenOpString(OpKind op, const std::string &proto,
     throw "unknown OpKind!";
     break;
   }
-  s += "; return r;";
+  if (op == OpHi || op == OpLo)
+    s += "; return u.r;";
+  else
+    s += "; return r;";
   return s;
 }
 
@@ -923,6 +930,11 @@ void NeonEmitter::run(raw_ostream &OS) {
     }
   }
   OS << "\n";
+  OS << "typedef __attribute__(( __vector_size__(8) ))  "
+    "double __neon_float64x1_t;\n";
+  OS << "typedef __attribute__(( __vector_size__(16) )) "
+    "double __neon_float64x2_t;\n";
+  OS << "\n";
 
   // Emit struct typedefs.
   for (unsigned vi = 1; vi != 5; ++vi) {