From bf2956d77ab0ad06c4b5505cc9906e51e5878274 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Mon, 12 Jul 2021 05:22:01 -0300
Subject: shader: Avoid usage of C++20 ranges to build in clang

---
 .../frontend/maxwell/control_flow.cpp                | 13 ++++++-------
 .../frontend/maxwell/structured_control_flow.cpp     |  8 ++++----
 .../frontend/maxwell/translate_program.cpp           | 20 +++++++++++++-------
 3 files changed, 23 insertions(+), 18 deletions(-)

(limited to 'src/shader_recompiler/frontend')

diff --git a/src/shader_recompiler/frontend/maxwell/control_flow.cpp b/src/shader_recompiler/frontend/maxwell/control_flow.cpp
index e7abea82f..1a954a509 100644
--- a/src/shader_recompiler/frontend/maxwell/control_flow.cpp
+++ b/src/shader_recompiler/frontend/maxwell/control_flow.cpp
@@ -5,7 +5,6 @@
 #include <algorithm>
 #include <array>
 #include <optional>
-#include <ranges>
 #include <string>
 #include <utility>
 
@@ -151,18 +150,18 @@ std::pair<Location, Stack> Stack::Pop(Token token) const {
 }
 
 std::optional<Location> Stack::Peek(Token token) const {
-    const auto reverse_entries{entries | std::views::reverse};
-    const auto it{std::ranges::find(reverse_entries, token, &StackEntry::token)};
-    if (it == reverse_entries.end()) {
+    const auto it{std::find_if(entries.rbegin(), entries.rend(),
+                               [token](const auto& entry) { return entry.token == token; })};
+    if (it == entries.rend()) {
         return std::nullopt;
     }
     return it->target;
 }
 
 Stack Stack::Remove(Token token) const {
-    const auto reverse_entries{entries | std::views::reverse};
-    const auto it{std::ranges::find(reverse_entries, token, &StackEntry::token)};
-    const auto pos{std::distance(reverse_entries.begin(), it)};
+    const auto it{std::find_if(entries.rbegin(), entries.rend(),
+                               [token](const auto& entry) { return entry.token == token; })};
+    const auto pos{std::distance(entries.rbegin(), it)};
     Stack result;
     result.entries.insert(result.entries.end(), entries.begin(), entries.end() - pos - 1);
     return result;
diff --git a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
index 221454b99..8b3e0a15c 100644
--- a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
+++ b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
@@ -4,7 +4,6 @@
 
 #include <algorithm>
 #include <memory>
-#include <ranges>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ -167,7 +166,7 @@ std::string DumpExpr(const Statement* stmt) {
     }
 }
 
-std::string DumpTree(const Tree& tree, u32 indentation = 0) {
+[[maybe_unused]] std::string DumpTree(const Tree& tree, u32 indentation = 0) {
     std::string ret;
     std::string indent(indentation, ' ');
     for (auto stmt = tree.begin(); stmt != tree.end(); ++stmt) {
@@ -315,8 +314,9 @@ class GotoPass {
 public:
     explicit GotoPass(Flow::CFG& cfg, ObjectPool<Statement>& stmt_pool) : pool{stmt_pool} {
         std::vector gotos{BuildTree(cfg)};
-        for (const Node& goto_stmt : gotos | std::views::reverse) {
-            RemoveGoto(goto_stmt);
+        const auto end{gotos.rend()};
+        for (auto goto_stmt = gotos.rbegin(); goto_stmt != end; ++goto_stmt) {
+            RemoveGoto(*goto_stmt);
         }
     }
 
diff --git a/src/shader_recompiler/frontend/maxwell/translate_program.cpp b/src/shader_recompiler/frontend/maxwell/translate_program.cpp
index 83c77967d..c067d459c 100644
--- a/src/shader_recompiler/frontend/maxwell/translate_program.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate_program.cpp
@@ -4,7 +4,6 @@
 
 #include <algorithm>
 #include <memory>
-#include <ranges>
 #include <vector>
 
 #include "common/settings.h"
@@ -20,12 +19,19 @@
 namespace Shader::Maxwell {
 namespace {
 IR::BlockList GenerateBlocks(const IR::AbstractSyntaxList& syntax_list) {
-    auto syntax_blocks{syntax_list | std::views::filter([](const auto& node) {
-                           return node.type == IR::AbstractSyntaxNode::Type::Block;
-                       })};
-    IR::BlockList blocks(std::ranges::distance(syntax_blocks));
-    std::ranges::transform(syntax_blocks, blocks.begin(),
-                           [](const IR::AbstractSyntaxNode& node) { return node.data.block; });
+    size_t num_syntax_blocks{};
+    for (const auto& node : syntax_list) {
+        if (node.type == IR::AbstractSyntaxNode::Type::Block) {
+            ++num_syntax_blocks;
+        }
+    }
+    IR::BlockList blocks;
+    blocks.reserve(num_syntax_blocks);
+    for (const auto& node : syntax_list) {
+        if (node.type == IR::AbstractSyntaxNode::Type::Block) {
+            blocks.push_back(node.data.block);
+        }
+    }
     return blocks;
 }
 
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