Commit 10b1001a12

LemonBoy <thatlemon@gmail.com>
2020-11-12 09:27:29
stage1: Ask LLVM to produce compact code in ReleaseSize mode
Let's follow what Clang does for -Oz and apply the `minsize` and `optsize` attributes by default. Closes #7048 Supersedes #7077
1 parent eaa1db2
Changed files (1)
src
stage1
codegen.cpp
src/stage1/codegen.cpp
@@ -484,6 +484,12 @@ static LLVMValueRef make_fn_llvm_value(CodeGen *g, ZigFn *fn) {
         addLLVMFnAttrInt(llvm_fn, "alignstack", fn->alignstack_value);
     }
 
+    if (g->build_mode == BuildModeSmallRelease) {
+        // Optimize for small code size.
+        addLLVMFnAttr(llvm_fn, "minsize");
+        addLLVMFnAttr(llvm_fn, "optsize");
+    }
+
     addLLVMFnAttr(llvm_fn, "nounwind");
     add_uwtable_attr(g, llvm_fn);
     addLLVMFnAttr(llvm_fn, "nobuiltin");