AArch64: Restrict macroop fusion heuristics to cyclone.

Even though this is just some hinting for the scheduler it doesn't make
sense to do that unless you know the target can perform the fusion.

llvm-svn: 242732

1 files changed, 33 insertions, 31 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
index 429f6939db9..f5b0c8b450a 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -1445,38 +1445,40 @@ bool AArch64InstrInfo::shouldClusterLoads(MachineInstr *FirstLdSt,
 
 bool AArch64InstrInfo::shouldScheduleAdjacent(MachineInstr *First,
                                               MachineInstr *Second) const {
-  // Cyclone can fuse CMN, CMP, TST followed by Bcc.
-  unsigned SecondOpcode = Second->getOpcode();
-  if (SecondOpcode == AArch64::Bcc) {
-    switch (First->getOpcode()) {
-    default:
-      return false;
-    case AArch64::SUBSWri:
-    case AArch64::ADDSWri:
-    case AArch64::ANDSWri:
-    case AArch64::SUBSXri:
-    case AArch64::ADDSXri:
-    case AArch64::ANDSXri:
-      return true;
+  if (Subtarget.isCyclone()) {
+    // Cyclone can fuse CMN, CMP, TST followed by Bcc.
+    unsigned SecondOpcode = Second->getOpcode();
+    if (SecondOpcode == AArch64::Bcc) {
+      switch (First->getOpcode()) {
+      default:
+        return false;
+      case AArch64::SUBSWri:
+      case AArch64::ADDSWri:
+      case AArch64::ANDSWri:
+      case AArch64::SUBSXri:
+      case AArch64::ADDSXri:
+      case AArch64::ANDSXri:
+        return true;
+      }
     }
-  }
-  // Cyclone B0 also supports ALU operations followed by CBZ/CBNZ.
-  if (SecondOpcode == AArch64::CBNZW || SecondOpcode == AArch64::CBNZX ||
-      SecondOpcode == AArch64::CBZW || SecondOpcode == AArch64::CBZX) {
-    switch (First->getOpcode()) {
-    default:
-      return false;
-    case AArch64::ADDWri:
-    case AArch64::ADDXri:
-    case AArch64::ANDWri:
-    case AArch64::ANDXri:
-    case AArch64::EORWri:
-    case AArch64::EORXri:
-    case AArch64::ORRWri:
-    case AArch64::ORRXri:
-    case AArch64::SUBWri:
-    case AArch64::SUBXri:
-      return true;
+    // Cyclone B0 also supports ALU operations followed by CBZ/CBNZ.
+    if (SecondOpcode == AArch64::CBNZW || SecondOpcode == AArch64::CBNZX ||
+        SecondOpcode == AArch64::CBZW || SecondOpcode == AArch64::CBZX) {
+      switch (First->getOpcode()) {
+      default:
+        return false;
+      case AArch64::ADDWri:
+      case AArch64::ADDXri:
+      case AArch64::ANDWri:
+      case AArch64::ANDXri:
+      case AArch64::EORWri:
+      case AArch64::EORXri:
+      case AArch64::ORRWri:
+      case AArch64::ORRXri:
+      case AArch64::SUBWri:
+      case AArch64::SUBXri:
+        return true;
+      }
     }
   }
   return false;