From 05a0b8bc661b5a1565c54e021c353ef191fa3f61 Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Thu, 16 Jul 2009 14:27:01 +0000
Subject: [PATCH] Handle bitconverts

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76042 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/SystemZ/SystemZISelLowering.cpp | 4 ++++
 lib/Target/SystemZ/SystemZInstrFP.td       | 7 +++++++
 lib/Target/SystemZ/SystemZInstrInfo.td     | 9 +++++----
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index 757255e3ebb..05797c81ab9 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -129,6 +129,10 @@ SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
   setOperationAction(ISD::FCOS,             MVT::f32, Expand);
   setOperationAction(ISD::FCOS,             MVT::f64, Expand);
 
+  // We have only 64-bit bitconverts
+  setOperationAction(ISD::BIT_CONVERT,      MVT::f32, Promote);
+  setOperationAction(ISD::BIT_CONVERT,      MVT::i32, Promote);
+
   setOperationAction(ISD::UINT_TO_FP,       MVT::i32, Expand);
   setOperationAction(ISD::UINT_TO_FP,       MVT::i64, Expand);
   setOperationAction(ISD::FP_TO_UINT,       MVT::i32, Expand);
diff --git a/lib/Target/SystemZ/SystemZInstrFP.td b/lib/Target/SystemZ/SystemZInstrFP.td
index 9e367fe43a5..5972264d1e7 100644
--- a/lib/Target/SystemZ/SystemZInstrFP.td
+++ b/lib/Target/SystemZ/SystemZInstrFP.td
@@ -295,6 +295,13 @@ def FCONVGR64   : Pseudo<(outs GR64:$dst), (ins FP64:$src),
                           (implicit PSW)]>;
 } // Defs = [PSW]
 
+def FBCONVG64   : Pseudo<(outs GR64:$dst), (ins FP64:$src),
+                         "lgdr\t{$dst, $src}",
+                         [(set GR64:$dst, (bitconvert FP64:$src))]>;
+def FBCONVF64   : Pseudo<(outs FP64:$dst), (ins GR64:$src),
+                         "ldgr\t{$dst, $src}",
+                         [(set FP64:$dst, (bitconvert GR64:$src))]>;
+
 //===----------------------------------------------------------------------===//
 // Test instructions (like AND but do not produce any result)
 
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.td b/lib/Target/SystemZ/SystemZInstrInfo.td
index 5672b048d20..7bfd8eb82bd 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -785,7 +785,11 @@ def : Pat<(SystemZcall (i64 texternalsym:$dst)), (CALLi texternalsym:$dst)>;
 
 // FIXME: use add/sub tricks with 32678/-32768
 
-// Arbitrary immediate support.  Implement in terms of LLIHF/OILF.
+// Arbitrary immediate support.
+def : Pat<(i32 imm:$src),
+          (EXTRACT_SUBREG (MOV64ri32 (i64 imm:$src)), subreg_32bit)>;
+
+// Implement in terms of LLIHF/OILF.
 def : Pat<(i64 imm:$imm),
           (OR64rilo32 (MOV64rihi32 (HI32 imm:$imm)), (LO32 imm:$imm))>;
 
@@ -821,6 +825,3 @@ def : Pat<(mulhu GR64:$src1, GR64:$src2),
                                                      GR64:$src1, subreg_odd),
                                       GR64:$src2),
                           subreg_even)>;
-
-def : Pat<(i32 imm:$src),
-          (EXTRACT_SUBREG (MOV64ri32 (i64 imm:$src)), subreg_32bit)>;