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CL/aarch64: implement the wasm SIMD pseudo-max/min and FP-rounding instructions

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This patch implements, for aarch64, the following wasm SIMD extensions

  Floating-point rounding instructions
  https://github.com/WebAssembly/simd/pull/232

  Pseudo-Minimum and Pseudo-Maximum instructions
  https://github.com/WebAssembly/simd/pull/122

The changes are straightforward:

* `build.rs`: the relevant tests have been enabled

* `cranelift/codegen/meta/src/shared/instructions.rs`: new CLIF instructions
  `fmin_pseudo` and `fmax_pseudo`.  The wasm rounding instructions do not need
  any new CLIF instructions.

* `cranelift/wasm/src/code_translator.rs`: translation into CLIF; this is
  pretty much the same as any other unary or binary vector instruction (for
  the rounding and the pmin/max respectively)

* `cranelift/codegen/src/isa/aarch64/lower_inst.rs`:
  - `fmin_pseudo` and `fmax_pseudo` are converted into a two instruction
    sequence, `fcmpgt` followed by `bsl`
  - the CLIF rounding instructions are converted to a suitable vector
    `frint{n,z,p,m}` instruction.

* `cranelift/codegen/src/isa/aarch64/inst/mod.rs`: minor extension of `pub
  enum VecMisc2` to handle the rounding operations.  And corresponding `emit`
  cases.
This commit is contained in:
Julian Seward
2020-10-23 11:39:50 +02:00
committed by julian-seward1
parent fc1cedb2ff
commit c15d9bd61b
8 changed files with 265 additions and 37 deletions
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14
build.rs
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@@ -229,17 +229,17 @@ fn ignore(testsuite: &str, testname: &str, strategy: &str) -> bool {
return env::var("CARGO_CFG_TARGET_ARCH").unwrap() != "x86_64";
}
// This is only implemented on aarch64.
("simd", "simd_boolean") => {
// These are only implemented on aarch64.
("simd", "simd_boolean")
| ("simd", "simd_f32x4_pmin_pmax")
| ("simd", "simd_f32x4_rounding")
| ("simd", "simd_f64x2_pmin_pmax")
| ("simd", "simd_f64x2_rounding") => {
return env::var("CARGO_CFG_TARGET_ARCH").unwrap() != "aarch64";
}
// These tests have simd operators which aren't implemented yet.
("simd", "simd_f32x4_pmin_pmax") => return true,
("simd", "simd_f32x4_rounding") => return true,
("simd", "simd_f64x2_pmin_pmax") => return true,
("simd", "simd_f64x2_rounding") => return true,
// (currently none)
_ => {}
},
_ => panic!("unrecognized strategy"),