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[codegen] reintroduce support for carry and borrow instructions in RI… (#1005)

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Reintroduce support for iadd carry variants and isub borrow variants for
RISC ISAs which had been removed in
https://github.com/CraneStation/cranelift/pull/961 and
https://github.com/CraneStation/cranelift/pull/962 because of the lack
of a proper flags register in RISC architectures.
This commit is contained in:
Ujjwal Sharma
2019-09-13 20:57:50 +05:30
committed by Benjamin Bouvier
parent cadd0ac655
commit 3418fb6e18
17 changed files with 326 additions and 85 deletions
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4
cranelift/codegen/meta/src/isa/arm64/mod.rs
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@@ -60,8 +60,8 @@ pub(crate) fn define(shared_defs: &mut SharedDefinitions) -> TargetIsa {
let mut a64 = CpuMode::new("A64");
// TODO refine these.
let narrow = shared_defs.transform_groups.by_name("narrow");
a64.legalize_default(narrow);
let narrow_flags = shared_defs.transform_groups.by_name("narrow_flags");
a64.legalize_default(narrow_flags);
let cpu_modes = vec![a64];