[llvm] 7c8796f - [TTI] Add supportsScalableVectors target hook

[Cullen Rhodes via llvm-commits]

Author: Cullen Rhodes
Date: 2020-12-18T10:37:01Z
New Revision: 7c8796f9db2c82ea6e3721744a7d98ebf0e77cd3

URL: https://github.com/llvm/llvm-project/commit/7c8796f9db2c82ea6e3721744a7d98ebf0e77cd3
DIFF: https://github.com/llvm/llvm-project/commit/7c8796f9db2c82ea6e3721744a7d98ebf0e77cd3.diff

LOG: [TTI] Add supportsScalableVectors target hook

This is split off from D91718 and adds a new target hook
supportsScalableVectors that can be queried to check if scalable vectors
are supported by the backend. For AArch64 this returns true if SVE is
enabled.

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D93060

Added: 
    

Modified: 
    llvm/include/llvm/Analysis/TargetTransformInfo.h
    llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    llvm/lib/Analysis/TargetTransformInfo.cpp
    llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/Analysis/TargetTransformInfo.h b/llvm/include/llvm/Analysis/TargetTransformInfo.h
index b9b9df35cdb0..0953a3b3f451 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -1340,6 +1340,9 @@ class TargetTransformInfo {
   /// to a stack reload.
   unsigned getGISelRematGlobalCost() const;
 
+  /// \returns True if the target supports scalable vectors.
+  bool supportsScalableVectors() const;
+
   /// \name Vector Predication Information
   /// @{
   /// Whether the target supports the %evl parameter of VP intrinsic efficiently
@@ -1634,6 +1637,7 @@ class TargetTransformInfo::Concept {
                                                ReductionFlags) const = 0;
   virtual bool shouldExpandReduction(const IntrinsicInst *II) const = 0;
   virtual unsigned getGISelRematGlobalCost() const = 0;
+  virtual bool supportsScalableVectors() const = 0;
   virtual bool hasActiveVectorLength() const = 0;
   virtual int getInstructionLatency(const Instruction *I) = 0;
 };
@@ -2163,6 +2167,10 @@ class TargetTransformInfo::Model final : public TargetTransformInfo::Concept {
     return Impl.getGISelRematGlobalCost();
   }
 
+  bool supportsScalableVectors() const override {
+    return Impl.supportsScalableVectors();
+  }
+
   bool hasActiveVectorLength() const override {
     return Impl.hasActiveVectorLength();
   }

diff  --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
index 2c206094ac4a..6415e7bfe7c3 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -685,6 +685,8 @@ class TargetTransformInfoImplBase {
 
   unsigned getGISelRematGlobalCost() const { return 1; }
 
+  bool supportsScalableVectors() const { return false; }
+
   bool hasActiveVectorLength() const { return false; }
 
 protected:

diff  --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index 086a212ee65b..becf74c64fd5 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -1056,6 +1056,10 @@ unsigned TargetTransformInfo::getGISelRematGlobalCost() const {
   return TTIImpl->getGISelRematGlobalCost();
 }
 
+bool TargetTransformInfo::supportsScalableVectors() const {
+  return TTIImpl->supportsScalableVectors();
+}
+
 int TargetTransformInfo::getInstructionLatency(const Instruction *I) const {
   return TTIImpl->getInstructionLatency(I);
 }

diff  --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
index baf11cd7fa23..c8e721b1fb9f 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
@@ -228,6 +228,8 @@ class AArch64TTIImpl : public BasicTTIImplBase<AArch64TTIImpl> {
     return 2;
   }
 
+  bool supportsScalableVectors() const { return ST->hasSVE(); }
+
   bool useReductionIntrinsic(unsigned Opcode, Type *Ty,
                              TTI::ReductionFlags Flags) const;