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Implement iabs in ISLE (AArch64) (#4399)

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* Implement `iabs` in ISLE (AArch64)

Converts the existing implementation of `iabs` for AArch64 into ISLE,
and fixes support for `iabs` on scalar values.

Copyright (c) 2022 Arm Limited.

* Improve scalar `iabs` implementation.

Also introduces `CSNeg` instruction.

Copyright (c) 2022 Arm Limited
This commit is contained in:
Damian Heaton
2022-07-18 19:12:34 +01:00
committed by GitHub
parent db7f9ccd2b
commit d792646677
8 changed files with 208 additions and 32 deletions
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12
cranelift/codegen/src/isa/aarch64/inst/mod.rs
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@@ -669,6 +669,11 @@ fn aarch64_get_operands<F: Fn(VReg) -> VReg>(inst: &Inst, collector: &mut Operan
collector.reg_use(rn);
collector.reg_use(rm);
}
&Inst::CSNeg { rd, rn, rm, .. } => {
collector.reg_def(rd);
collector.reg_use(rn);
collector.reg_use(rm);
}
&Inst::CSet { rd, .. } | &Inst::CSetm { rd, .. } => {
collector.reg_def(rd);
}
@@ -1510,6 +1515,13 @@ impl Inst {
let cond = cond.pretty_print(0, allocs);
format!("csel {}, {}, {}, {}", rd, rn, rm, cond)
}
&Inst::CSNeg { rd, rn, rm, cond } => {
let rd = pretty_print_ireg(rd.to_reg(), OperandSize::Size64, allocs);
let rn = pretty_print_ireg(rn, OperandSize::Size64, allocs);
let rm = pretty_print_ireg(rm, OperandSize::Size64, allocs);
let cond = cond.pretty_print(0, allocs);
format!("csneg {}, {}, {}, {}", rd, rn, rm, cond)
}
&Inst::CSet { rd, cond } => {
let rd = pretty_print_ireg(rd.to_reg(), OperandSize::Size64, allocs);
let cond = cond.pretty_print(0, allocs);