From b52a28a8026d552e10cb18c3b7b1f7b10d23bf81 Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Thu, 12 Nov 2020 09:27:29 +0100
Subject: 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
---
 src/stage1/codegen.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/stage1/codegen.cpp')

diff --git a/src/stage1/codegen.cpp b/src/stage1/codegen.cpp
index 08c7e72e97..38c537ae12 100644
--- a/src/stage1/codegen.cpp
+++ b/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");
-- 
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