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Use faster clamping for Uint8ClampedArray (#422)

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Max Graey 2019-02-22 16:26:30 +02:00 committed by Daniel Wirtz
parent 6a1ffb8e2f
commit ed97672a8c
3 changed files with 293 additions and 289 deletions
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8
std/assembly/typedarray.ts
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@ -15,6 +15,10 @@ import {
COMPARATOR COMPARATOR
} from "./internal/sort"; } from "./internal/sort";
function clampToByte(value: i32): i32 {
return ~(value >> 31) & (((255 - value) >> 31) | value); // & 255
}
export class Int8Array extends TypedArray<i8> { export class Int8Array extends TypedArray<i8> {
@lazy static readonly BYTES_PER_ELEMENT: usize = sizeof<i8>(); @lazy static readonly BYTES_PER_ELEMENT: usize = sizeof<i8>();
@ -112,12 +116,12 @@ export class Uint8ClampedArray extends Uint8Array {
@inline @operator("[]=") @inline @operator("[]=")
protected __set(index: i32, value: i32): void { protected __set(index: i32, value: i32): void {
super.__set(index, max(min(value, 255), 0)); super.__set(index, clampToByte(value));
} }
@inline @operator("{}=") @inline @operator("{}=")
protected __unchecked_set(index: i32, value: i32): void { protected __unchecked_set(index: i32, value: i32): void {
super.__unchecked_set(index, max(min(value, 255), 0)); super.__unchecked_set(index, clampToByte(value));
} }
fill(value: u32, start: i32 = 0, end: i32 = i32.MAX_VALUE): Uint8ClampedArray { fill(value: u32, start: i32 = 0, end: i32 = i32.MAX_VALUE): Uint8ClampedArray {

22
tests/compiler/std/typedarray.optimized.wat
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@ -1814,21 +1814,21 @@
i32.store8 offset=8 i32.store8 offset=8
) )
(func $~lib/typedarray/Uint8ClampedArray#__set (; 25 ;) (type $iii_) (param $0 i32) (param $1 i32) (param $2 i32) (func $~lib/typedarray/Uint8ClampedArray#__set (; 25 ;) (type $iii_) (param $0 i32) (param $1 i32) (param $2 i32)
(local $3 i32)
local.get $0 local.get $0
local.get $1 local.get $1
local.get $2
i32.const 255 i32.const 255
local.get $2 local.get $2
i32.const 255 i32.sub
i32.lt_s i32.const 31
select i32.shr_s
local.tee $3 local.get $2
i32.const 0 i32.or
local.get $3 local.get $2
i32.const 0 i32.const 31
i32.gt_s i32.shr_s
select i32.const -1
i32.xor
i32.and
call $~lib/internal/typedarray/TypedArray<u8>#__set call $~lib/internal/typedarray/TypedArray<u8>#__set
) )
(func $~lib/internal/typedarray/TypedArray<u8>#__get (; 26 ;) (type $iii) (param $0 i32) (param $1 i32) (result i32) (func $~lib/internal/typedarray/TypedArray<u8>#__get (; 26 ;) (type $iii) (param $0 i32) (param $1 i32) (result i32)

552
tests/compiler/std/typedarray.untouched.wat
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