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MachInst backend: don't reallocate RealRegUniverses for each function

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compilation.

This saves ~0.14% instruction count, ~0.18% allocated bytes, and ~1.5%
allocated blocks on a `clif-util wasm` compilation of `bz2.wasm` for
aarch64.
This commit is contained in:
Chris Fallin
2020-05-08 13:36:39 -07:00
parent 0bc0503f3f
commit 17cef9140c
6 changed files with 28 additions and 26 deletions
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5
cranelift/codegen/src/machinst/mod.rs
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@@ -186,9 +186,6 @@ pub trait MachInst: Clone + Debug {
/// BlockIndex.
fn with_block_offsets(&mut self, my_offset: CodeOffset, targets: &[CodeOffset]);
/// Get the register universe for this backend.
fn reg_universe(flags: &Flags) -> RealRegUniverse;
/// Align a basic block offset (from start of function). By default, no
/// alignment occurs.
fn align_basic_block(offset: CodeOffset) -> CodeOffset {
@@ -264,7 +261,7 @@ pub trait MachBackend {
fn name(&self) -> &'static str;
/// Return the register universe for this backend.
fn reg_universe(&self) -> RealRegUniverse;
fn reg_universe(&self) -> &RealRegUniverse;
/// Machine-specific condcode info needed by TargetIsa.
fn unsigned_add_overflow_condition(&self) -> IntCC {