Add support for OpAtomicISub, OpAtomicIIncrement, OpAtomicIDecrement

These are the remaining operations which were not tested through the
dEQP-VK.image.* path.

Test: dEQP-VK.spirv_assembly.*
Bug: b/127472316
Change-Id: Icedc2fc7b972714bc67705e2458e1207972b95cc
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29457
Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Reactor/LLVMReactor.cpp

diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index 03720d6..c111d1a 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -1294,6 +1294,12 @@
 		return V(::builder->CreateAtomicRMW(llvm::AtomicRMWInst::Add, V(ptr), V(value), atomicOrdering(true, memoryOrder)));
 	}
 
+	Value *Nucleus::createAtomicSub(Value *ptr, Value *value, std::memory_order memoryOrder)
+	{
+		RR_DEBUG_INFO_UPDATE_LOC();
+		return V(::builder->CreateAtomicRMW(llvm::AtomicRMWInst::Sub, V(ptr), V(value), atomicOrdering(true, memoryOrder)));
+	}
+
 	Value *Nucleus::createAtomicAnd(Value *ptr, Value *value, std::memory_order memoryOrder)
 	{
 		RR_DEBUG_INFO_UPDATE_LOC();

src/Reactor/Nucleus.hpp

diff --git a/src/Reactor/Nucleus.hpp b/src/Reactor/Nucleus.hpp
index 82ccafa..a524595 100644
--- a/src/Reactor/Nucleus.hpp
+++ b/src/Reactor/Nucleus.hpp
@@ -102,6 +102,7 @@
 
 		// Atomic instructions
 		static Value *createAtomicAdd(Value *ptr, Value *value, std::memory_order memoryOrder = std::memory_order_relaxed);
+		static Value *createAtomicSub(Value *ptr, Value *value, std::memory_order memoryOrder = std::memory_order_relaxed);
 		static Value *createAtomicAnd(Value *ptr, Value *value, std::memory_order memoryOrder = std::memory_order_relaxed);
 		static Value *createAtomicOr(Value *ptr, Value *value, std::memory_order memoryOrder = std::memory_order_relaxed);
 		static Value *createAtomicXor(Value *ptr, Value *value, std::memory_order memoryOrder = std::memory_order_relaxed);

src/Reactor/Reactor.cpp

diff --git a/src/Reactor/Reactor.cpp b/src/Reactor/Reactor.cpp
index 43bc1d6..b2c99e2 100644
--- a/src/Reactor/Reactor.cpp
+++ b/src/Reactor/Reactor.cpp
@@ -2512,6 +2512,11 @@
 		return RValue<UInt>(Nucleus::createAtomicAdd(x.value, y.value, memoryOrder));
 	}
 
+	RValue<UInt> SubAtomic(RValue<Pointer<UInt> > x, RValue<UInt> y, std::memory_order memoryOrder)
+	{
+		return RValue<UInt>(Nucleus::createAtomicSub(x.value, y.value, memoryOrder));
+	}
+
 	RValue<UInt> AndAtomic(RValue<Pointer<UInt> > x, RValue<UInt> y, std::memory_order memoryOrder)
 	{
 		return RValue<UInt>(Nucleus::createAtomicAnd(x.value, y.value, memoryOrder));

src/Reactor/Reactor.hpp

diff --git a/src/Reactor/Reactor.hpp b/src/Reactor/Reactor.hpp
index fc9a5a1..1c7b5ca 100644
--- a/src/Reactor/Reactor.hpp
+++ b/src/Reactor/Reactor.hpp
@@ -1269,6 +1269,7 @@
 	RValue<UInt> Clamp(RValue<UInt> x, RValue<UInt> min, RValue<UInt> max);
 
 	RValue<UInt> AddAtomic(RValue<Pointer<UInt>> x, RValue<UInt> y, std::memory_order memoryOrder);
+	RValue<UInt> SubAtomic(RValue<Pointer<UInt>> x, RValue<UInt> y, std::memory_order memoryOrder);
 	RValue<UInt> AndAtomic(RValue<Pointer<UInt>> x, RValue<UInt> y, std::memory_order memoryOrder);
 	RValue<UInt> OrAtomic(RValue<Pointer<UInt>> x, RValue<UInt> y, std::memory_order memoryOrder);
 	RValue<UInt> XorAtomic(RValue<Pointer<UInt>> x, RValue<UInt> y, std::memory_order memoryOrder);

src/Reactor/SubzeroReactor.cpp

diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index b8a91db..86f0c00 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -1039,6 +1039,12 @@
 		return nullptr;
 	}
 
+	Value *Nucleus::createAtomicSub(Value *ptr, Value *value, std::memory_order memoryOrder)
+	{
+		UNIMPLEMENTED("createAtomicSub");
+		return nullptr;
+	}
+
 	Value *Nucleus::createAtomicAnd(Value *ptr, Value *value, std::memory_order memoryOrder)
 	{
 		UNIMPLEMENTED("createAtomicAnd");