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Support -Ctarget-cpu

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This commit is contained in:
Muhammad Mominul Huque 2021-04-23 17:04:45 +06:00
parent cdc0aa188e
commit e16ccba394
1 changed files with 8 additions and 3 deletions
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11
src/lib.rs
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@ -273,9 +273,14 @@ fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Box<dyn isa::Tar
let variant = cranelift_codegen::isa::BackendVariant::MachInst;
let mut isa_builder = cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
// Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
// is interpreted as `bsr`.
isa_builder.enable("nehalem").unwrap();
if let Some(target_cpu) = sess.opts.cg.target_cpu.as_ref() {
isa_builder.enable(target_cpu).unwrap();
} else {
// Don't use "haswell" as the default, as it implies `has_lzcnt`.
// macOS CI is still at Ivy Bridge EP, so `lzcnt` is interpreted as `bsr`.
isa_builder.enable("nehalem").unwrap();
}
isa_builder.finish(flags)
}