From 9a5df73e32819c45884feee6bd49e7ebe911f977 Mon Sep 17 00:00:00 2001
From: Juergen Ributzka <juergen@apple.com>
Date: Wed, 30 Oct 2013 06:36:19 +0000
Subject: Revert "SelectionDAG: Teach the legalizer to split SETCC if VSELECT
 needs splitting too."

Now Hexagon and SystemZ are not happy with it :-(

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193677 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/DAGCombiner.cpp          | 22 ------------
 lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp | 21 +++++-------
 lib/Target/X86/X86ISelLowering.cpp                | 11 +-----
 test/CodeGen/X86/vec_split.ll                     | 42 -----------------------
 4 files changed, 9 insertions(+), 87 deletions(-)
 delete mode 100644 test/CodeGen/X86/vec_split.ll

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 8237ef3779..de0f6ce26d 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4346,28 +4346,6 @@ SDValue DAGCombiner::visitVSELECT(SDNode *N) {
     }
   }
 
-  // Treat SETCC as a vector mask and promote the result type based on the
-  // targets expected SETCC result type. This will ensure that SETCC and VSELECT
-  // are both split by the type legalizer. This is done to prevent the type
-  // legalizer from unrolling SETCC into scalar comparions.
-  EVT SelectVT = N->getValueType(0);
-  EVT MaskVT = getSetCCResultType(SelectVT);
-  if (N0.getOpcode() == ISD::SETCC && N0.getValueType() != MaskVT) {
-    SDLoc MaskDL(N0);
-
-    // Extend the mask to the desired value type.
-    ISD::NodeType ExtendCode =
-      TargetLowering::getExtendForContent(TLI.getBooleanContents(true));
-    SDValue Mask = DAG.getNode(ExtendCode, MaskDL, MaskVT, N0);
-
-    AddToWorkList(Mask.getNode());
-
-    SDValue LHS = N->getOperand(1);
-    SDValue RHS = N->getOperand(2);
-
-    return DAG.getNode(ISD::VSELECT, DL, SelectVT, Mask, LHS, RHS);
-  }
-
   return SDValue();
 }
 
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
index f1b06fcd98..7b1d14dad0 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
@@ -492,19 +492,14 @@ void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo,
   SDValue Cond = N->getOperand(0);
   CL = CH = Cond;
   if (Cond.getValueType().isVector()) {
-    if (Cond.getOpcode() == ISD::SETCC) {
-      assert(Cond.getValueType() == getSetCCResultType(N->getValueType(0)) &&
-             "Condition has not been prepared for split!");
-      GetSplitVector(Cond, CL, CH);
-    } else {
-      EVT ETy = Cond.getValueType().getVectorElementType();
-      unsigned NumElements = Cond.getValueType().getVectorNumElements();
-      EVT VCondTy = EVT::getVectorVT(*DAG.getContext(), ETy, NumElements / 2);
-      CL = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
-                       DAG.getConstant(0, TLI.getVectorIdxTy()));
-      CH = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
-                       DAG.getConstant(NumElements / 2, TLI.getVectorIdxTy()));
-    }
+    assert(Cond.getValueType().getVectorElementType() == MVT::i1 &&
+           "Condition legalized before result?");
+    unsigned NumElements = Cond.getValueType().getVectorNumElements();
+    EVT VCondTy = EVT::getVectorVT(*DAG.getContext(), MVT::i1, NumElements / 2);
+    CL = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
+                     DAG.getConstant(0, TLI.getVectorIdxTy()));
+    CH = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
+                     DAG.getConstant(NumElements / 2, TLI.getVectorIdxTy()));
   }
 
   Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), CL, LL, RL);
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 18064fc615..5dbef0f6fc 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1546,16 +1546,7 @@ void X86TargetLowering::resetOperationActions() {
 }
 
 EVT X86TargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
-  if (!VT.isVector())
-    return MVT::i8;
-
-  const TargetMachine &TM = getTargetMachine();
-  if (!TM.Options.UseSoftFloat && Subtarget->hasAVX512())
-    switch(VT.getVectorNumElements()) {
-    case  8: return MVT::v8i1;
-    case 16: return MVT::v16i1;
-    }
-
+  if (!VT.isVector()) return MVT::i8;
   return VT.changeVectorElementTypeToInteger();
 }
 
diff --git a/test/CodeGen/X86/vec_split.ll b/test/CodeGen/X86/vec_split.ll
deleted file mode 100644
index f9e7c20ba4..0000000000
--- a/test/CodeGen/X86/vec_split.ll
+++ /dev/null
@@ -1,42 +0,0 @@
-; RUN: llc -march=x86-64 -mcpu=corei7 < %s | FileCheck %s -check-prefix=SSE4
-; RUN: llc -march=x86-64 -mcpu=corei7-avx < %s | FileCheck %s -check-prefix=AVX1
-; RUN: llc -march=x86-64 -mcpu=core-avx2 < %s | FileCheck %s -check-prefix=AVX2
-
-define <16 x i16> @split16(<16 x i16> %a, <16 x i16> %b, <16 x i8> %__mask) {
-; SSE4-LABEL: split16:
-; SSE4: pminuw
-; SSE4: pminuw
-; SSE4: ret
-; AVX1-LABEL: split16:
-; AVX1: vpminuw
-; AVX1: vpminuw
-; AVX1: ret
-; AVX2-LABEL: split16:
-; AVX2: vpminuw
-; AVX2: ret
-  %1 = icmp ult <16 x i16> %a, %b
-  %2 = select <16 x i1> %1, <16 x i16> %a, <16 x i16> %b
-  ret <16 x i16> %2
-}
-
-define <32 x i16> @split32(<32 x i16> %a, <32 x i16> %b, <32 x i8> %__mask) {
-; SSE4-LABEL: split32:
-; SSE4: pminuw
-; SSE4: pminuw
-; SSE4: pminuw
-; SSE4: pminuw
-; SSE4: ret
-; AVX1-LABEL: split32:
-; AVX1: vpminuw
-; AVX1: vpminuw
-; AVX1: vpminuw
-; AVX1: vpminuw
-; AVX1: ret
-; AVX2-LABEL: split32:
-; AVX2: vpminuw
-; AVX2: vpminuw
-; AVX2: ret
-  %1 = icmp ult <32 x i16> %a, %b
-  %2 = select <32 x i1> %1, <32 x i16> %a, <32 x i16> %b
-  ret <32 x i16> %2
-}
-- 
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