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Rollup merge of #86652 - nagisa:nagisa/non-leaf-fp, r=petrochenkov

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Add support for leaf function frame pointer elimination

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
This commit is contained in:
Guillaume Gomez
2021-07-01 11:15:41 +02:00
committed by GitHub
parent 052e8d5933 9b67cba4f6
commit dfd30d7b70
24 changed files with 149 additions and 60 deletions
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2
compiler/rustc_codegen_ssa/src/traits/misc.rs
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@@ -16,7 +16,7 @@ pub trait MiscMethods<'tcx>: BackendTypes {
fn sess(&self) -> &Session;
fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx>;
fn used_statics(&self) -> &RefCell<Vec<Self::Value>>;
fn set_frame_pointer_elimination(&self, llfn: Self::Function);
fn set_frame_pointer_type(&self, llfn: Self::Function);
fn apply_target_cpu_attr(&self, llfn: Self::Function);
fn create_used_variable(&self);
/// Declares the extern "C" main function for the entry point. Returns None if the symbol already exists.