Add support for bitfields (#3639)

* Add support for bitfields

Closes https://github.com/shader-slang/slang/issues/3559

* Set scopes for syntsized bitfield accessors

* Simplify generated code for bitfield accessors

* spelling

* regenerate vs project

* warnings

1 files changed, 5 insertions, 31 deletions

diff --git a/source/slang/slang-ir-autodiff.cpp b/source/slang/slang-ir-autodiff.cpp
index 2cc4e3b57..14b53c0e0 100644
--- a/source/slang/slang-ir-autodiff.cpp
+++ b/source/slang/slang-ir-autodiff.cpp
@@ -96,32 +96,6 @@ IRInst* lookupForwardDerivativeReference(IRInst* primalFunction)
     return nullptr;
 }
 
-IRStructField* DifferentialPairTypeBuilder::findField(IRInst* type, IRStructKey* key)
-{
-    if (auto irStructType = as<IRStructType>(type))
-    {
-        for (auto field : irStructType->getFields())
-        {
-            if (field->getKey() == key)
-            {
-                return field;
-            }
-        }
-    }
-    else if (auto irSpecialize = as<IRSpecialize>(type))
-    {
-        if (auto irGeneric = as<IRGeneric>(irSpecialize->getBase()))
-        {
-            if (auto irGenericStructType = as<IRStructType>(findInnerMostGenericReturnVal(irGeneric)))
-            {
-                return findField(irGenericStructType, key);
-            }
-        }
-    }
-
-    return nullptr;
-}
-
 IRInst* DifferentialPairTypeBuilder::findSpecializationForParam(IRInst* specializeInst, IRInst* genericParam)
 {
     // Get base generic that's being specialized.
@@ -162,7 +136,7 @@ IRInst* DifferentialPairTypeBuilder::emitFieldAccessor(IRBuilder* builder, IRIns
     if (auto basePairStructType = as<IRStructType>(pairType))
     {
         return as<IRFieldExtract>(builder->emitFieldExtract(
-                findField(basePairStructType, key)->getFieldType(),
+                findStructField(basePairStructType, key)->getFieldType(),
                 baseInst,
                 key
             ));
@@ -178,7 +152,7 @@ IRInst* DifferentialPairTypeBuilder::emitFieldAccessor(IRBuilder* builder, IRIns
                     builder->getPtrType((IRType*)
                         findSpecializationForParam(
                             ptrInnerSpecializedType,
-                            findField(ptrInnerSpecializedType, key)->getFieldType())),
+                            findStructField(ptrInnerSpecializedType, key)->getFieldType())),
                     baseInst,
                     key
                 ));
@@ -188,7 +162,7 @@ IRInst* DifferentialPairTypeBuilder::emitFieldAccessor(IRBuilder* builder, IRIns
         {
             return as<IRFieldAddress>(builder->emitFieldAddress(
                 builder->getPtrType((IRType*)
-                        findField(ptrBaseStructType, key)->getFieldType()),
+                        findStructField(ptrBaseStructType, key)->getFieldType()),
                 baseInst,
                 key));
         }
@@ -204,7 +178,7 @@ IRInst* DifferentialPairTypeBuilder::emitFieldAccessor(IRBuilder* builder, IRIns
             return as<IRFieldExtract>(builder->emitFieldExtract(
                 (IRType*)findSpecializationForParam(
                     specializedType,
-                    findField(genericBasePairStructType, key)->getFieldType()),
+                    findStructField(genericBasePairStructType, key)->getFieldType()),
                 baseInst,
                 key
             ));
@@ -217,7 +191,7 @@ IRInst* DifferentialPairTypeBuilder::emitFieldAccessor(IRBuilder* builder, IRIns
                         builder->getPtrType((IRType*)
                             findSpecializationForParam(
                                 specializedType,
-                                findField(genericPairStructType, key)->getFieldType())),
+                                findStructField(genericPairStructType, key)->getFieldType())),
                         baseInst,
                         key
                     ));