From bfe6f50b8e8a61a764e36be4674e3de18986117c Mon Sep 17 00:00:00 2001
From: Hans-Kristian Arntzen <hans-kristian.arntzen@arm.com>
Date: Mon, 15 Jan 2018 13:20:30 +0100
Subject: [PATCH] Remove cfg_analysis option.

Not using this is broken, and won't work anymore.
---
 main.cpp       |  5 +----
 spirv_glsl.cpp | 51 +++++++++++++++++++++++---------------------------
 spirv_glsl.hpp |  3 ---
 3 files changed, 24 insertions(+), 35 deletions(-)

diff --git a/main.cpp b/main.cpp
index 695c152..49fc865 100644
--- a/main.cpp
+++ b/main.cpp
@@ -479,12 +479,11 @@ struct CLIArguments
 	bool flatten_multidimensional_arrays = false;
 	bool use_420pack_extension = true;
 	bool remove_unused = false;
-	bool cfg_analysis = true;
 };
 
 static void print_help()
 {
-	fprintf(stderr, "Usage: spirv-cross [--output <output path>] [SPIR-V file] [--es] [--no-es] [--no-cfg-analysis] "
+	fprintf(stderr, "Usage: spirv-cross [--output <output path>] [SPIR-V file] [--es] [--no-es] "
 	                "[--version <GLSL version>] [--dump-resources] [--help] [--force-temporary] "
 	                "[--vulkan-semantics] [--flatten-ubo] [--fixup-clipspace] [--flip-vert-y] [--iterations iter] "
 	                "[--cpp] [--cpp-interface-name <name>] "
@@ -634,7 +633,6 @@ static int main_inner(int argc, char *argv[])
 		args.version = parser.next_uint();
 		args.set_version = true;
 	});
-	cbs.add("--no-cfg-analysis", [&args](CLIParser &) { args.cfg_analysis = false; });
 	cbs.add("--dump-resources", [&args](CLIParser &) { args.dump_resources = true; });
 	cbs.add("--force-temporary", [&args](CLIParser &) { args.force_temporary = true; });
 	cbs.add("--flatten-ubo", [&args](CLIParser &) { args.flatten_ubo = true; });
@@ -796,7 +794,6 @@ static int main_inner(int argc, char *argv[])
 	opts.vulkan_semantics = args.vulkan_semantics;
 	opts.vertex.fixup_clipspace = args.fixup;
 	opts.vertex.flip_vert_y = args.yflip;
-	opts.cfg_analysis = args.cfg_analysis;
 	compiler->set_options(opts);
 
 	// Set HLSL specific options.
diff --git a/spirv_glsl.cpp b/spirv_glsl.cpp
index a3e5b5c..a56c82d 100644
--- a/spirv_glsl.cpp
+++ b/spirv_glsl.cpp
@@ -7701,41 +7701,36 @@ void CompilerGLSL::emit_function(SPIRFunction &func, uint64_t return_flags)
 
 	if (!func.analyzed_variable_scope)
 	{
-		if (options.cfg_analysis)
+		analyze_variable_scope(func);
+
+		// Check if we can actually use the loop variables we found in analyze_variable_scope.
+		// To use multiple initializers, we need the same type and qualifiers.
+		for (auto block : func.blocks)
 		{
-			analyze_variable_scope(func);
+			auto &b = get<SPIRBlock>(block);
+			if (b.loop_variables.size() < 2)
+				continue;
 
-			// Check if we can actually use the loop variables we found in analyze_variable_scope.
-			// To use multiple initializers, we need the same type and qualifiers.
-			for (auto block : func.blocks)
+			uint64_t flags = get_decoration_mask(b.loop_variables.front());
+			uint32_t type = get<SPIRVariable>(b.loop_variables.front()).basetype;
+			bool invalid_initializers = false;
+			for (auto loop_variable : b.loop_variables)
 			{
-				auto &b = get<SPIRBlock>(block);
-				if (b.loop_variables.size() < 2)
-					continue;
-
-				uint64_t flags = get_decoration_mask(b.loop_variables.front());
-				uint32_t type = get<SPIRVariable>(b.loop_variables.front()).basetype;
-				bool invalid_initializers = false;
-				for (auto loop_variable : b.loop_variables)
+				if (flags != get_decoration_mask(loop_variable) ||
+				    type != get<SPIRVariable>(b.loop_variables.front()).basetype)
 				{
-					if (flags != get_decoration_mask(loop_variable) ||
-					    type != get<SPIRVariable>(b.loop_variables.front()).basetype)
-					{
-						invalid_initializers = true;
-						break;
-					}
-				}
-
-				if (invalid_initializers)
-				{
-					for (auto loop_variable : b.loop_variables)
-						get<SPIRVariable>(loop_variable).loop_variable = false;
-					b.loop_variables.clear();
+					invalid_initializers = true;
+					break;
 				}
 			}
+
+			if (invalid_initializers)
+			{
+				for (auto loop_variable : b.loop_variables)
+					get<SPIRVariable>(loop_variable).loop_variable = false;
+				b.loop_variables.clear();
+			}
 		}
-		else
-			entry_block.dominated_variables = func.local_variables;
 		func.analyzed_variable_scope = true;
 	}
 
diff --git a/spirv_glsl.hpp b/spirv_glsl.hpp
index 72d5e6a..2c5ee67 100644
--- a/spirv_glsl.hpp
+++ b/spirv_glsl.hpp
@@ -65,9 +65,6 @@ public:
 		// Debug option to always emit temporary variables for all expressions.
 		bool force_temporary = false;
 
-		// If true, variables will be moved to their appropriate scope through CFG analysis.
-		bool cfg_analysis = true;
-
 		// If true, Vulkan GLSL features are used instead of GL-compatible features.
 		// Mostly useful for debugging SPIR-V files.
 		bool vulkan_semantics = false;