[PATCH] D36649: [X86][ARM][TargetLowering] Add SrcVT to isExtractSubvectorCheap

Craig Topper via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Sat Aug 12 15:46:53 PDT 2017


craig.topper created this revision.
Herald added subscribers: kristof.beyls, javed.absar, aemerson.

Without the SrcVT its hard to know what is really being asked for. For example if your target has 128, 256, and 512 bit vectors. Maybe extracting 128 from 256 is cheap, but maybe extracting 128 from 512 is not.

For x86 we do support extracting a quarter of a 512-bit register. But for i1 vectors we don't have isel patterns for extracting arbitrary pieces. So we need this to have a correct implementation of isExtractSubvectorCheap for mask vectors.


https://reviews.llvm.org/D36649

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h


Index: lib/Target/X86/X86ISelLowering.h
===================================================================
--- lib/Target/X86/X86ISelLowering.h
+++ lib/Target/X86/X86ISelLowering.h
@@ -1036,7 +1036,8 @@
 
     /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
     /// with this index.
-    bool isExtractSubvectorCheap(EVT ResVT, unsigned Index) const override;
+    bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
+                                 unsigned Index) const override;
 
     /// Intel processors have a unified instruction and data cache
     const char * getClearCacheBuiltinName() const override {
Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -4574,7 +4574,7 @@
   return true;
 }
 
-bool X86TargetLowering::isExtractSubvectorCheap(EVT ResVT,
+bool X86TargetLowering::isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
                                                 unsigned Index) const {
   if (!isOperationLegalOrCustom(ISD::EXTRACT_SUBVECTOR, ResVT))
     return false;
Index: lib/Target/ARM/ARMISelLowering.h
===================================================================
--- lib/Target/ARM/ARMISelLowering.h
+++ lib/Target/ARM/ARMISelLowering.h
@@ -459,7 +459,8 @@
 
     /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
     /// with this index.
-    bool isExtractSubvectorCheap(EVT ResVT, unsigned Index) const override;
+    bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
+                                 unsigned Index) const override;
 
     /// \brief Returns true if an argument of type Ty needs to be passed in a
     /// contiguous block of registers in calling convention CallConv.
Index: lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- lib/Target/ARM/ARMISelLowering.cpp
+++ lib/Target/ARM/ARMISelLowering.cpp
@@ -13402,7 +13402,7 @@
   return true;
 }
 
-bool ARMTargetLowering::isExtractSubvectorCheap(EVT ResVT,
+bool ARMTargetLowering::isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
                                                 unsigned Index) const {
   if (!isOperationLegalOrCustom(ISD::EXTRACT_SUBVECTOR, ResVT))
     return false;
Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14212,7 +14212,7 @@
       VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, ConcatOps);
       VecIn2 = SDValue();
     } else if (InVT1.getSizeInBits() == VT.getSizeInBits() * 2) {
-      if (!TLI.isExtractSubvectorCheap(VT, NumElems))
+      if (!TLI.isExtractSubvectorCheap(VT, InVT1, NumElems))
         return SDValue();
 
       if (!VecIn2.getNode()) {
Index: include/llvm/Target/TargetLowering.h
===================================================================
--- include/llvm/Target/TargetLowering.h
+++ include/llvm/Target/TargetLowering.h
@@ -2176,7 +2176,8 @@
   /// with this index. This is needed because EXTRACT_SUBVECTOR usually
   /// has custom lowering that depends on the index of the first element,
   /// and only the target knows which lowering is cheap.
-  virtual bool isExtractSubvectorCheap(EVT ResVT, unsigned Index) const {
+  virtual bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
+                                       unsigned Index) const {
     return false;
   }
 


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