[AArch64] This bit of logic is specific to pairing. NFC.

llvm-svn: 260383

1 files changed, 10 insertions, 8 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
index 04fadf97609..285fcc2007f 100644
--- a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -1147,15 +1147,8 @@ AArch64LoadStoreOpt::findMatchingInsn(MachineBasicBlock::iterator I,
   unsigned Reg = getLdStRegOp(FirstMI).getReg();
   unsigned BaseReg = getLdStBaseOp(FirstMI).getReg();
   int Offset = getLdStOffsetOp(FirstMI).getImm();
-  bool IsNarrowStore = isNarrowStore(Opc);
-
-  // Early exit if the offset is not possible to match. (6 bits of positive
-  // range, plus allow an extra one in case we find a later insn that matches
-  // with Offset-1)
   int OffsetStride = IsUnscaled ? getMemScale(FirstMI) : 1;
-  if (!(isNarrowLoad(Opc) || IsNarrowStore) &&
-      !inBoundsForPair(IsUnscaled, Offset, OffsetStride))
-    return E;
+  bool IsNarrowStore = isNarrowStore(Opc);
 
   // Track which registers have been modified and used between the first insn
   // (inclusive) and the second insn.
@@ -1608,6 +1601,15 @@ bool AArch64LoadStoreOpt::tryToPairLdStInst(MachineBasicBlock::iterator &MBBI) {
   if (!isCandidateToMergeOrPair(MI))
     return false;
 
+  // Early exit if the offset is not possible to match. (6 bits of positive
+  // range, plus allow an extra one in case we find a later insn that matches
+  // with Offset-1)
+  bool IsUnscaled = isUnscaledLdSt(MI);
+  int Offset = getLdStOffsetOp(MI).getImm();
+  int OffsetStride = IsUnscaled ? getMemScale(MI) : 1;
+  if (!inBoundsForPair(IsUnscaled, Offset, OffsetStride))
+    return false;
+
   // Look ahead up to LdStLimit instructions for a pairable instruction.
   LdStPairFlags Flags;
   MachineBasicBlock::iterator Paired = findMatchingInsn(MBBI, Flags, LdStLimit);