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Add raw_bitcast instruction

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Casts bits as a different type of the same width with no change to the data (unlike bitcast)
This commit is contained in:
Andrew Brown
2019-07-11 11:07:26 -07:00
committed by Dan Gohman
parent 5f0e5567c1
commit 61772e9775
5 changed files with 61 additions and 10 deletions
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15
cranelift/codegen/meta/src/isa/x86/encodings.rs
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@@ -9,7 +9,6 @@ use crate::cdsl::instructions::{
};
use crate::cdsl::recipes::{EncodingRecipe, EncodingRecipeNumber, Recipes};
use crate::cdsl::settings::{SettingGroup, SettingPredicateNumber};
use crate::cdsl::types::ValueType;
use crate::shared::types::Bool::{B1, B16, B32, B64, B8};
use crate::shared::types::Float::{F32, F64};
@@ -333,6 +332,7 @@ pub fn define(
let load_complex = shared.by_name("load_complex");
let nearest = shared.by_name("nearest");
let popcnt = shared.by_name("popcnt");
let raw_bitcast = shared.by_name("raw_bitcast");
let regfill = shared.by_name("regfill");
let regmove = shared.by_name("regmove");
let regspill = shared.by_name("regspill");
@@ -452,6 +452,7 @@ pub fn define(
let rec_ldWithIndexDisp8 = r.template("ldWithIndexDisp8");
let rec_mulx = r.template("mulx");
let rec_null = r.recipe("null");
let rec_null_fpr = r.recipe("null_fpr");
let rec_pcrel_fnaddr8 = r.template("pcrel_fnaddr8");
let rec_pcrel_gvaddr8 = r.template("pcrel_gvaddr8");
let rec_popq = r.template("popq");
@@ -1588,5 +1589,17 @@ pub fn define(
e.enc_x86_64_isap(instruction, template, use_sse2);
}
// SIMD bitcast all 128-bit vectors to each other (for legalizing splat.x16x8)
for from_type in ValueType::all_lane_types().filter(|t| t.lane_bits() >= 8) {
for to_type in ValueType::all_lane_types().filter(|t| t.lane_bits() >= 8 && *t != from_type)
{
let instruction = raw_bitcast
.bind_vector(to_type, 128 / to_type.lane_bits())
.bind_vector(from_type, 128 / from_type.lane_bits());
e.enc32_rec(instruction.clone(), rec_null_fpr, 0);
e.enc64_rec(instruction, rec_null_fpr, 0);
}
}
e
}