bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Auto merge of #76071 - khyperia:configurable_to_immediate, r=eddyb

Browse source 
Make to_immediate/from_immediate configurable by backends

`librustc_codegen_ssa` has the concept of an immediate vs. memory type, and `librustc_codegen_llvm` uses this distinction to implement `bool`s being `i8` in memory, and `i1` in immediate contexts. However, some of that implementation leaked into `codegen_ssa` when converting to/from immediate values. So, move those methods into builder traits, so that behavior can be configured by backends.

This is useful if a backend is able to keep bools as bools, or, needs to do more trickery than just bools to bytes.

(Note that there's already a large amount of things abstracted with "immediate types" - this is just bringing this particular thing in line to be abstracted as well)

---

Pinging @eddyb since that's who I was talking about this change with when they suggested I submit a PR.
This commit is contained in:
bors 2020-09-01 07:44:34 +00:00
commit 6f1bbf5ee0
7 changed files with 56 additions and 68 deletions
Download patch file Download diff file Expand all files Collapse all files

4
compiler/rustc_codegen_llvm/src/intrinsic.rs
View file

@ -8,7 +8,7 @@ use crate::va_arg::emit_va_arg;
use crate::value::Value;
use rustc_ast as ast;
use rustc_codegen_ssa::base::{compare_simd_types, to_immediate, wants_msvc_seh};
use rustc_codegen_ssa::base::{compare_simd_types, wants_msvc_seh};
use rustc_codegen_ssa::common::span_invalid_monomorphization_error;
use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
use rustc_codegen_ssa::glue;
@ -301,7 +301,7 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
unsafe {
llvm::LLVMSetAlignment(load, align);
}
to_immediate(self, load, self.layout_of(tp_ty))
self.to_immediate(load, self.layout_of(tp_ty))
}
sym::volatile_store => {
let dst = args[0].deref(self.cx());