[MCA] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-tools-llvm-mca

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/110622.diff

1 Files Affected:

• (modified) llvm/lib/MCA/InstrBuilder.cpp (+3-2)

diff --git a/llvm/lib/MCA/InstrBuilder.cpp b/llvm/lib/MCA/InstrBuilder.cpp
index c4d88856abdfb9..933ede71746e06 100644
--- a/llvm/lib/MCA/InstrBuilder.cpp
+++ b/llvm/lib/MCA/InstrBuilder.cpp
@@ -665,8 +665,9 @@ InstrBuilder::getOrCreateInstrDesc(const MCInst &MCI,
   SchedClassID = *VariantSchedClassIDOrErr;
 
   auto VDKey = std::make_pair(hashMCInst(MCI), SchedClassID);
-  if (VariantDescriptors.contains(VDKey))
-    return *VariantDescriptors[VDKey];
+  auto It = VariantDescriptors.find(VDKey);
+  if (It != VariantDescriptors.end())
+    return *It->second;
 
   return createInstrDescImpl(MCI, IVec);
 }

[boomanaiden154]

LGTM.