VkPipeline: Add basic optimization passes.

A lot of the Regres timeouts we are seeing are in LLVM code generation. These appear to happen for shaders with a pathological number of loads and stores - most likely created by glslang. Each of these loads and stores produce a bunch of branches in the LLVM IR (due to lane masking), which then choke LLVM. Tests: dEQP-VK.ssbo.layout.* Change-Id: I0bb654d9001d0d6bdd02244844bed8e73ce8d9d4 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28348 Presubmit-Ready: Ben Clayton <bclayton@google.com> Reviewed-by: Chris Forbes <chrisforbes@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Ben Clayton <bclayton@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

VkPipeline: Add basic optimization passes.
4fa92a7b · Ben Clayton · 5d143aa0 · 4fa92a7b
Commit 4fa92a7b authored Apr 03, 2019 by Ben Clayton
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VkPipeline.cpp src/Vulkan/VkPipeline.cpp +9 -0

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--- a/src/Vulkan/VkPipeline.cpp
+++ b/src/Vulkan/VkPipeline.cpp
@@ -228,6 +228,15 @@ std::vector<uint32_t> preprocessSpirv(
 	opt.RegisterPass(spvtools::CreateFreezeSpecConstantValuePass());
 	opt.RegisterPass(spvtools::CreateFoldSpecConstantOpAndCompositePass());
+	// Basic optimization passes to primarily address glslang's love of loads &
+	// stores. Significantly reduces time spent in LLVM passes and codegen.
+	opt.RegisterPass(spvtools::CreateLocalAccessChainConvertPass());
+	opt.RegisterPass(spvtools::CreateLocalSingleBlockLoadStoreElimPass());
+	opt.RegisterPass(spvtools::CreateLocalSingleStoreElimPass());
+	opt.RegisterPass(spvtools::CreateBlockMergePass());
+	opt.RegisterPass(spvtools::CreateLocalMultiStoreElimPass());
+	opt.RegisterPass(spvtools::CreateSSARewritePass());
 	std::vector<uint32_t> optimized;
 	opt.Run(code.data(), code.size(), &optimized);