From 45d9961a6a86d184248ef84f6a07125b0c224f97 Mon Sep 17 00:00:00 2001
From: Ellie Hermaszewska <ellieh@nvidia.com>
Date: Wed, 16 Aug 2023 08:57:47 +0800
Subject: Use ankerl/unordered_dense as a hashmap implementation (#3036)
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* Correct namespace for getClockFrequency

* missing const

* Add missing assignment operator

* Remove unused variables

* Return correct modified variable

* Use stable hash code for file system identity

* terse static_assert

* Structured binding for map iteration

* Make (==) and getHashCode const on many structs

* Add ConstIterator for LinkedList

* Replace uses of ItemProxy::getValue with Dictionary::at

* Extract list of loads from gradientsMap before updating it

* Const correctness in type layout

* Add unordered_dense hashmap submodule

* Use wyhash or getHashCode in slang-hash.h

* refactor slang-hash.h

* Use ankerl/unordered_dense as a hashmap implementation

Notable changes:
- The subscript operator returns a reference directly to the value,
  rather than a lazy ItemProxy (pair of dict pointer and key)

slang-profile time (95% over 10 runs):

- Before: 6.3913906 (±0.0746)
- After:  5.9276123 (±0.0964)

* 64 bit hash for strings

So they have the same hash as char buffers with the same contents

* Narrowing warnings for gcc to match msvc

* revert back to c++17

* Correct c++ version for msvc

* Use path to unordered_dense which keeps tests happy

* Do not assign to and read from map in same expression

* Remove redundant map operations in primal-hoist

* Split out stable hash functions into slang-stable-hash.h

* 64 bit hash by default

* regenerate vs projects

* Correct return type from HashSetBase::getCount()

* correct width for call to Dictionary::reserve

* Use stable hash for obfuscated module ids

* Signed int for reserve

* clearer variable naming

* Parameterize Dictionary on hash and equality functors

* Allow heterogenous lookup for Dictionary

* missing const

* Use set over operator[] in some places

* Remove unused function

* s/at/getValue
---
 source/slang/slang-ir-specialize-dispatch.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'source/slang/slang-ir-specialize-dispatch.cpp')

diff --git a/source/slang/slang-ir-specialize-dispatch.cpp b/source/slang/slang-ir-specialize-dispatch.cpp
index 4b26ced32..d57e1ed96 100644
--- a/source/slang/slang-ir-specialize-dispatch.cpp
+++ b/source/slang/slang-ir-specialize-dispatch.cpp
@@ -333,10 +333,8 @@ void specializeDispatchFunctions(SharedGenericsLoweringContext* sharedContext)
     ensureWitnessTableSequentialIDs(sharedContext);
 
     // Generate specialized dispatch functions and fixup call sites.
-    for (auto kv : sharedContext->mapInterfaceRequirementKeyToDispatchMethods)
+    for (const auto& [_, dispatchFunc] : sharedContext->mapInterfaceRequirementKeyToDispatchMethods)
     {
-        auto dispatchFunc = kv.value;
-
         // Generate a specialized `switch` statement based dispatch func,
         // from the witness tables present in the module.
         auto newDispatchFunc = specializeDispatchFunction(sharedContext, dispatchFunc);
-- 
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