bjoernager/rust
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Add LLVM attributes in batches instead of individually

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This should improve performance.
This commit is contained in:
Erik Desjardins 2022-02-21 11:19:16 -05:00
parent 6f681a8eb3
commit 30d3ce0674
11 changed files with 451 additions and 473 deletions
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17
compiler/rustc_codegen_llvm/src/declare.rs
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@ -18,8 +18,8 @@ use crate::llvm;
use crate::llvm::AttributePlace::Function;
use crate::type_::Type;
use crate::value::Value;
use rustc_codegen_ssa::traits::*;
use rustc_middle::ty::Ty;
use smallvec::SmallVec;
use tracing::debug;
/// Declare a function.
@ -41,12 +41,21 @@ fn declare_raw_fn<'ll>(
llvm::SetFunctionCallConv(llfn, callconv);
llvm::SetUnnamedAddress(llfn, unnamed);
let mut attrs_to_remove = SmallVec::<[_; 4]>::new();
let mut attrs_to_add = SmallVec::<[_; 4]>::new();
if cx.tcx.sess.opts.cg.no_redzone.unwrap_or(cx.tcx.sess.target.disable_redzone) {
llvm::Attribute::NoRedZone.apply_llfn(Function, llfn);
attrs_to_add.push(llvm::AttributeKind::NoRedZone.create_attr(cx.llcx));
}
attributes::default_optimisation_attrs(cx.tcx.sess, llfn);
attributes::non_lazy_bind(cx.sess(), llfn);
let (to_remove, to_add) = attributes::default_optimisation_attrs(cx);
attrs_to_remove.extend(to_remove);
attrs_to_add.extend(to_add);
attrs_to_add.extend(attributes::non_lazy_bind_attr(cx));
attributes::remove_from_llfn(llfn, Function, &attrs_to_remove);
attributes::apply_to_llfn(llfn, Function, &attrs_to_add);
llfn
}