[llvm] [PowerPC] Avoid repeated hash lookups (NFC) (PR #132659)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/132659.diff


1 Files Affected:

- (modified) llvm/lib/Target/PowerPC/PPCFastISel.cpp (+4-4) 


``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCFastISel.cpp b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
index 9e7185287d291..e92e00f80c552 100644
--- a/llvm/lib/Target/PowerPC/PPCFastISel.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
@@ -2263,17 +2263,17 @@ Register PPCFastISel::fastMaterializeConstant(const Constant *C) {
 // Materialize the address created by an alloca into a register, and
 // return the register number (or zero if we failed to handle it).
 Register PPCFastISel::fastMaterializeAlloca(const AllocaInst *AI) {
+  DenseMap<const AllocaInst *, int>::iterator SI =
+      FuncInfo.StaticAllocaMap.find(AI);
+
   // Don't handle dynamic allocas.
-  if (!FuncInfo.StaticAllocaMap.count(AI))
+  if (SI == FuncInfo.StaticAllocaMap.end())
     return Register();
 
   MVT VT;
   if (!isLoadTypeLegal(AI->getType(), VT))
     return Register();
 
-  DenseMap<const AllocaInst*, int>::iterator SI =
-    FuncInfo.StaticAllocaMap.find(AI);
-
   if (SI != FuncInfo.StaticAllocaMap.end()) {
     Register ResultReg = createResultReg(&PPC::G8RC_and_G8RC_NOX0RegClass);
     BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, MIMD, TII.get(PPC::ADDI8),

``````````

</details>


https://github.com/llvm/llvm-project/pull/132659