[llvm] [SPIR-V] Add pass to merge convergence region exit targets (PR #92531)

[Natalie Chouinard via llvm-commits]

Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/92531 at github.com>


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@@ -0,0 +1,287 @@
+//===-- SPIRVMergeRegionExitTargets.cpp ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Merge the multiple exit targets of a convergence region into a single block.
+// Each exit target will be assigned a constant value, and a phi node + switch
+// will allow the new exit target to re-route to the correct basic block.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Analysis/SPIRVConvergenceRegionAnalysis.h"
+#include "SPIRV.h"
+#include "SPIRVSubtarget.h"
+#include "SPIRVTargetMachine.h"
+#include "SPIRVUtils.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/IntrinsicsSPIRV.h"
+#include "llvm/InitializePasses.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+#include "llvm/Transforms/Utils/LoopSimplify.h"
+#include "llvm/Transforms/Utils/LowerMemIntrinsics.h"
+
+using namespace llvm;
+
+namespace llvm {
+void initializeSPIRVMergeRegionExitTargetsPass(PassRegistry &);
+} // namespace llvm
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sudonatalie wrote:

nit: merge same side-by-side namespace blocks?

https://github.com/llvm/llvm-project/pull/92531