[Mlir-commits] [mlir] [Affine] Avoid repeated hash lookups (NFC) (PR #111330)

[Kazu Hirata]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/111330

None

>From c115f039804c406fc8a612a39d7f4d01dc5ea47f Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 6 Oct 2024 09:27:24 -0700
Subject: [PATCH] [Affine] Avoid repeated hash lookups (NFC)

---
 mlir/lib/Dialect/Affine/Analysis/Utils.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mlir/lib/Dialect/Affine/Analysis/Utils.cpp b/mlir/lib/Dialect/Affine/Analysis/Utils.cpp
index 194ee9115e3d7a..29608647d85746 100644
--- a/mlir/lib/Dialect/Affine/Analysis/Utils.cpp
+++ b/mlir/lib/Dialect/Affine/Analysis/Utils.cpp
@@ -1927,9 +1927,9 @@ static std::optional<int64_t> getMemoryFootprintBytes(Block &block,
       return opInst->emitError("error obtaining memory region\n");
     }
 
-    auto it = regions.find(region->memref);
-    if (it == regions.end()) {
-      regions[region->memref] = std::move(region);
+    auto [it, inserted] = regions.try_emplace(region->memref);
+    if (inserted) {
+      it->second = std::move(region);
     } else if (failed(it->second->unionBoundingBox(*region))) {
       return opInst->emitWarning(
           "getMemoryFootprintBytes: unable to perform a union on a memory "