CBE: exploit Liveness analysis to reuse locals

build.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+if [ "x$1" != x--debug ]; then
+    cmake -GNinja -S. -Bbuild -DCMAKE_BUILD_TYPE:STRING=Release -DCMAKE_C_COMPILER:FILEPATH=clang -DCMAKE_CXX_COMPILER:FILEPATH=clang++ -DZIG_NO_LIB:BOOL=ON
+    cmake --build build
+    cmake --install build
+fi
+build/stage3/bin/zig build -p debug -Dno-lib -Denable-stage1 -Denable-llvm -freference-trace
+#build/stage3/bin/zig build -p only-c -Dno-lib -Donly-c

src/link/C.zig

@@ -136,16 +136,7 @@ pub fn updateFunc(self: *C, module: *Module, func: *Module.Fn, air: Air, livenes
     };
 
     function.object.indent_writer = .{ .underlying_writer = function.object.code.writer() };
-    defer {
-        function.blocks.deinit(module.gpa);
-        function.value_map.deinit();
-        function.object.code.deinit();
-        for (function.object.dg.typedefs.values()) |typedef| {
-            module.gpa.free(typedef.rendered);
-        }
-        function.object.dg.typedefs.deinit();
-        function.object.dg.fwd_decl.deinit();
-    }
+    defer function.deinit(module.gpa);
 
     codegen.genFunc(&function) catch |err| switch (err) {
         error.AnalysisFail => {

test.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+if [[ $1 == --enable-fixed-behavior ]]; then
+    declare -A offsets
+    git g -n stage2_c test/behavior | while read -r match; do
+        printf '\e[36mTrying to enable... %s\e[m\n' "$match"
+        file=`cut -d: -f1 <<<"$match"`
+        offset=${offsets[$file]:=0}
+        let line=`cut -d: -f2 <<<"$match"`-$offset
+        contents=`cut -d: -f3- <<<"$match"`
+        sed --in-place "${line}d" "$file"
+        if zigd test -Itest test/behavior.zig -fno-stage1 -fno-LLVM -ofmt=c; then
+            printf '\e[32mTest was enabled! :)\e[m\n'
+            let offsets[$file]+=1
+        else
+            printf '\e[31mTest kept disabled. :(\e[m\n'
+            sed --in-place "${line}i\\
+$contents" "$file"
+        fi
+    done
+fi