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Reorganise optimisation level settings, and make the insn shrink pass optional (#1044)

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This patch:

* removes the "default" opt level, on the basis that it has no definition and
  is referred to nowhere in the compiler.

* renames the "fastest" level to "none".  The resulting set of transformations
  is unchanged.

* renames the "best" level to "speed_and_size".  The resulting set of
  transformations is unchanged.

* adds a new level, "speed".  This is the same as "speed_and_size" except that
  it omits transformations aimed only at reducing code size.  Currently it
  omits only the insn shrinking pass.
This commit is contained in:
julian-seward1
2019-09-19 18:51:25 +02:00
committed by GitHub
parent 59139c6c46
commit 9e088e4164
27 changed files with 46 additions and 39 deletions
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14
cranelift/codegen/src/context.rs
View File

@@ -132,18 +132,18 @@ impl Context {
self.verify_if(isa)?;
debug!("Compiling:\n{}", self.func.display(isa));
let opt_level = isa.flags().opt_level();
self.compute_cfg();
if isa.flags().opt_level() != OptLevel::Fastest {
if opt_level != OptLevel::None {
self.preopt(isa)?;
}
if isa.flags().enable_nan_canonicalization() {
self.canonicalize_nans(isa)?;
}
self.legalize(isa)?;
if isa.flags().opt_level() != OptLevel::Fastest {
if opt_level != OptLevel::None {
self.postopt(isa)?;
}
if isa.flags().opt_level() == OptLevel::Best {
self.compute_domtree();
self.compute_loop_analysis();
self.licm(isa)?;
@@ -151,13 +151,15 @@ impl Context {
}
self.compute_domtree();
self.eliminate_unreachable_code(isa)?;
if isa.flags().opt_level() != OptLevel::Fastest {
if opt_level != OptLevel::None {
self.dce(isa)?;
}
self.regalloc(isa)?;
self.prologue_epilogue(isa)?;
if isa.flags().opt_level() == OptLevel::Best {
if opt_level == OptLevel::Speed || opt_level == OptLevel::SpeedAndSize {
self.redundant_reload_remover(isa)?;
}
if opt_level == OptLevel::SpeedAndSize {
self.shrink_instructions(isa)?;
}
let result = self.relax_branches(isa);