[llvm] dc74d7e - [X86] getMemoryOpCost - use dyn_cast_or_null<StoreInst>. NFCI.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2021-01-05T13:23:09Z
New Revision: dc74d7ed1f651aa61d15b4eaaa32200df1f38d37

URL: https://github.com/llvm/llvm-project/commit/dc74d7ed1f651aa61d15b4eaaa32200df1f38d37
DIFF: https://github.com/llvm/llvm-project/commit/dc74d7ed1f651aa61d15b4eaaa32200df1f38d37.diff

LOG: [X86] getMemoryOpCost - use dyn_cast_or_null<StoreInst>. NFCI.

Use instead of the isa_and_nonnull<StoreInst> and use the StoreInst::getPointerOperand wrapper instead of a hardcoded Instruction::getOperand.

Looks cleaner and avoids a spurious clang static analyzer null dereference warning.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86TargetTransformInfo.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index 5a342d41fb5e..71455237fb61 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -3188,11 +3188,10 @@ int X86TTIImpl::getMemoryOpCost(unsigned Opcode, Type *Src,
                                 const Instruction *I) {
   // TODO: Handle other cost kinds.
   if (CostKind != TTI::TCK_RecipThroughput) {
-    if (isa_and_nonnull<StoreInst>(I)) {
-      Value *Ptr = I->getOperand(1);
+    if (auto *SI = dyn_cast_or_null<StoreInst>(I)) {
       // Store instruction with index and scale costs 2 Uops.
       // Check the preceding GEP to identify non-const indices.
-      if (auto *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
+      if (auto *GEP = dyn_cast<GetElementPtrInst>(SI->getPointerOperand())) {
         if (!all_of(GEP->indices(), [](Value *V) { return isa<Constant>(V); }))
           return TTI::TCC_Basic * 2;
       }