bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Add flags customizing behaviour of MIR inlining

Browse source 
* `-Zinline-mir-threshold` to change the default threshold.
* `-Zinline-mir-hint-threshold` to change the threshold used by
  functions with inline hint.
This commit is contained in:
Tomasz Miąsko 2020-11-10 00:00:00 +00:00
parent cf9cf7c923
commit c8943c62f7
5 changed files with 86 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

9
compiler/rustc_mir/src/transform/inline.rs
View file

@ -16,9 +16,6 @@ use crate::transform::MirPass;
use std::iter;
use std::ops::{Range, RangeFrom};
const DEFAULT_THRESHOLD: usize = 50;
const HINT_THRESHOLD: usize = 100;
const INSTR_COST: usize = 5;
const CALL_PENALTY: usize = 25;
const LANDINGPAD_PENALTY: usize = 50;
@ -248,7 +245,11 @@ impl Inliner<'tcx> {
}
}
let mut threshold = if hinted { HINT_THRESHOLD } else { DEFAULT_THRESHOLD };
let mut threshold = if hinted {
self.tcx.sess.opts.debugging_opts.inline_mir_hint_threshold
} else {
self.tcx.sess.opts.debugging_opts.inline_mir_threshold
};
// Significantly lower the threshold for inlining cold functions
if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::COLD) {