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[std] Improve bswap #2077
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[std] Improve bswap #2077
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,39 +1,46 @@ | ||
| export function bswap<T extends number>(value: T): T { | ||
| if (isInteger<T>()) { | ||
| if (sizeof<T>() == 1) { | ||
| return value; | ||
| } | ||
| if (sizeof<T>() == 2) { | ||
| return <T>((value << 8) | ((value >>> 8) & <T>0x00FF)); | ||
| return <T>((value << 8) | ((value >>> 8) & 0x00FF)); | ||
| } | ||
| if (sizeof<T>() == 4) { | ||
| return <T>( | ||
| rotl<u32>(value & 0xFF00FF00, 8) | | ||
| rotr<u32>(value & 0x00FF00FF, 8) | ||
| rotl(value & 0xFF00FF00, 8) | | ||
| rotr(value & 0x00FF00FF, 8) | ||
| ); | ||
| } | ||
| if (sizeof<T>() == 8) { | ||
| let a = (<u64>value >> 8) & 0x00FF00FF00FF00FF; | ||
| let b = (<u64>value & 0x00FF00FF00FF00FF) << 8; | ||
| let a = (value >>> 8) & 0x00FF00FF00FF00FF; | ||
| let b = (value & 0x00FF00FF00FF00FF) << 8; | ||
| let v = a | b; | ||
|
|
||
| a = (v >> 16) & 0x0000FFFF0000FFFF; | ||
| a = (v >>> 16) & 0x0000FFFF0000FFFF; | ||
| b = (v & 0x0000FFFF0000FFFF) << 16; | ||
|
|
||
| return <T>rotr<u64>(a | b, 32); | ||
| } | ||
| return value; | ||
| } | ||
| assert(false); | ||
| return value; | ||
| ERROR("Unsupported generic type"); | ||
| } | ||
|
|
||
| export function bswap16<T extends number>(value: T): T { | ||
| if (isInteger<T>() && sizeof<T>() <= 4) { | ||
| if (isInteger<T>()) { | ||
| if (sizeof<T>() == 1) { | ||
| return value; | ||
| } | ||
| if (sizeof<T>() == 2) { | ||
| return <T>((value << 8) | ((value >>> 8) & <T>0x00FF)); | ||
| } else if (sizeof<T>() == 4) { | ||
| return <T>(((value << 8) & <T>0xFF00) | ((value >>> 8) & <T>0x00FF) | (value & <T>0xFFFF0000)); | ||
| return <T>((value << 8) | ((value >>> 8) & 0x00FF)); | ||
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|
||
| } | ||
| if (sizeof<T>() == 4) { | ||
| return <T>( | ||
| ((value << 8) & 0xFF00) | | ||
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|
||
| ((value >>> 8) & 0x00FF) | | ||
| (value & 0xFFFF0000) | ||
| ); | ||
| } | ||
| return value; | ||
| } | ||
| assert(false); | ||
| return value; | ||
| ERROR("Unsupported generic type"); | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -5179,6 +5179,10 @@ | |
| i32.const 1 | ||
| drop | ||
| i32.const 8 | ||
| i32.const 1 | ||
| i32.eq | ||
| drop | ||
| i32.const 8 | ||
| i32.const 2 | ||
| i32.eq | ||
| drop | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -13253,6 +13253,10 @@ | |
| i32.const 1 | ||
| drop | ||
| i32.const 8 | ||
| i32.const 1 | ||
| i32.eq | ||
| drop | ||
| i32.const 8 | ||
| i32.const 2 | ||
| i32.eq | ||
| drop | ||
|
|
||
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