[llvm] r323774 - [AArch64] Add new target feature to handle cheap as move for Exynos

[Evandro Menezes via llvm-commits]

Author: evandro
Date: Tue Jan 30 07:40:22 2018
New Revision: 323774

URL: http://llvm.org/viewvc/llvm-project?rev=323774&view=rev
Log:
[AArch64] Add new target feature to handle cheap as move for Exynos

This feature enables special handling of cheap as move in the existing
custom handling specifically for Exynos processors.

Differential revision: https://reviews.llvm.org/D42387

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64.td
    llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp
    llvm/trunk/lib/Target/AArch64/AArch64Subtarget.h

Modified: llvm/trunk/lib/Target/AArch64/AArch64.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64.td?rev=323774&r1=323773&r2=323774&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64.td (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64.td Tue Jan 30 07:40:22 2018
@@ -91,6 +91,11 @@ def FeatureCustomCheapAsMoveHandling : S
     "CustomAsCheapAsMove", "true",
     "Use custom code for TargetInstrInfo::isAsCheapAsAMove()">;
 
+def FeatureExynosCheapAsMoveHandling : SubtargetFeature<"exynos-cheap-as-move",
+    "ExynosAsCheapAsMove", "true",
+    "Use Exynos specific code in TargetInstrInfo::isAsCheapAsAMove()",
+    [FeatureCustomCheapAsMoveHandling]>;
+
 def FeaturePostRAScheduler : SubtargetFeature<"use-postra-scheduler",
     "UsePostRAScheduler", "true", "Schedule again after register allocation">;
 
@@ -311,7 +316,7 @@ def ProcExynosM1 : SubtargetFeature<"exy
                                     [FeatureSlowPaired128,
                                      FeatureCRC,
                                      FeatureCrypto,
-                                     FeatureCustomCheapAsMoveHandling,
+                                     FeatureExynosCheapAsMoveHandling,
                                      FeatureFPARMv8,
                                      FeatureFuseAES,
                                      FeatureNEON,
@@ -326,7 +331,7 @@ def ProcExynosM2 : SubtargetFeature<"exy
                                     [FeatureSlowPaired128,
                                      FeatureCRC,
                                      FeatureCrypto,
-                                     FeatureCustomCheapAsMoveHandling,
+                                     FeatureExynosCheapAsMoveHandling,
                                      FeatureFPARMv8,
                                      FeatureFuseAES,
                                      FeatureNEON,
@@ -339,7 +344,7 @@ def ProcExynosM3 : SubtargetFeature<"exy
                                     "Samsung Exynos-M3 processors",
                                     [FeatureCRC,
                                      FeatureCrypto,
-                                     FeatureCustomCheapAsMoveHandling,
+                                     FeatureExynosCheapAsMoveHandling,
                                      FeatureFPARMv8,
                                      FeatureFuseAES,
                                      FeatureFuseLiterals,

Modified: llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp?rev=323774&r1=323773&r2=323774&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp Tue Jan 30 07:40:22 2018
@@ -676,8 +676,7 @@ bool AArch64InstrInfo::isAsCheapAsAMove(
   if (!Subtarget.hasCustomCheapAsMoveHandling())
     return MI.isAsCheapAsAMove();
 
-  if (Subtarget.getProcFamily() == AArch64Subtarget::ExynosM1 ||
-      Subtarget.getProcFamily() == AArch64Subtarget::ExynosM3) {
+  if (Subtarget.hasExynosCheapAsMoveHandling()) {
     if (isExynosResetFast(MI) || isExynosShiftLeftFast(MI))
       return true;
     else

Modified: llvm/trunk/lib/Target/AArch64/AArch64Subtarget.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64Subtarget.h?rev=323774&r1=323773&r2=323774&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64Subtarget.h (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64Subtarget.h Tue Jan 30 07:40:22 2018
@@ -103,6 +103,7 @@ protected:
   bool PredictableSelectIsExpensive = false;
   bool BalanceFPOps = false;
   bool CustomAsCheapAsMove = false;
+  bool ExynosAsCheapAsMove = false;
   bool UsePostRAScheduler = false;
   bool Misaligned128StoreIsSlow = false;
   bool Paired128IsSlow = false;
@@ -226,6 +227,7 @@ public:
     return PredictableSelectIsExpensive;
   }
   bool hasCustomCheapAsMoveHandling() const { return CustomAsCheapAsMove; }
+  bool hasExynosCheapAsMoveHandling() const { return ExynosAsCheapAsMove; }
   bool isMisaligned128StoreSlow() const { return Misaligned128StoreIsSlow; }
   bool isPaired128Slow() const { return Paired128IsSlow; }
   bool isSTRQroSlow() const { return STRQroIsSlow; }