From 9b67cba4f6294e0db900397cdf5c59c1dc901ade Mon Sep 17 00:00:00 2001
From: Simonas Kazlauskas <git@kazlauskas.me>
Date: Sat, 26 Jun 2021 23:53:35 +0300
Subject: Add support for leaf fn frame pointer elimination
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This PR adds ability for the target specifications to specify frame
pointer emission type that's not just “always” or “whatever cg decides”.

In particular there's a new mode that allows omission of the frame
pointer for leaf functions (those that don't call any other functions).

We then set this new mode for Aarch64-based Apple targets.

Fixes #86196
---
 src/test/codegen/frame-pointer.rs | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/test/codegen/frame-pointer.rs

(limited to 'src/test/codegen')

diff --git a/src/test/codegen/frame-pointer.rs b/src/test/codegen/frame-pointer.rs
new file mode 100644
index 00000000000..367591dcb96
--- /dev/null
+++ b/src/test/codegen/frame-pointer.rs
@@ -0,0 +1,35 @@
+// compile-flags: --crate-type=rlib
+// revisions: aarch64-apple aarch64-linux force x64-apple x64-linux
+// [aarch64-apple] needs-llvm-components: aarch64
+// [aarch64-apple] compile-flags: --target=aarch64-apple-darwin
+// [aarch64-linux] needs-llvm-components: aarch64
+// [aarch64-linux] compile-flags: --target=aarch64-unknown-linux-gnu
+// [force] needs-llvm-components: x86
+// [force] compile-flags: --target=x86_64-unknown-linux-gnu -Cforce-frame-pointers=yes
+// [x64-apple] needs-llvm-components: x86
+// [x64-apple] compile-flags: --target=x86_64-apple-darwin
+// [x64-linux] needs-llvm-components: x86
+// [x64-linux] compile-flags: --target=x86_64-unknown-linux-gnu
+
+#![feature(no_core, lang_items)]
+#![no_core]
+#[lang="sized"]
+trait Sized { }
+#[lang="copy"]
+trait Copy { }
+
+
+
+// CHECK: define i32 @peach{{.*}}[[PEACH_ATTRS:\#[0-9]+]] {
+#[no_mangle]
+pub fn peach(x: u32) -> u32 {
+    x
+}
+
+// CHECK: attributes [[PEACH_ATTRS]] = {
+// x64-linux-NOT: {{.*}}"frame-pointer"{{.*}}
+// aarch64-linux-NOT: {{.*}}"frame-pointer"{{.*}}
+// x64-apple-SAME: {{.*}}"frame-pointer"="all"
+// force-SAME: {{.*}}"frame-pointer"="all"
+// aarch64-apple-SAME: {{.*}}"frame-pointer"="non-leaf"
+// CHECK-SAME: }
-- 
cgit 1.4.1-3-g733a5