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https://github.com/LadybirdBrowser/ladybird
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c301a21960
The callee and this-value preservation copies only matter while later argument expressions are still being evaluated. For zero-argument calls there is nothing left to clobber them, so we can keep the original operand and let the interpreter load it directly. This removes the hot Mov arg0->reg pattern from zero-argument local calls and reduces register pressure.
39 lines
994 B
Plaintext
39 lines
994 B
Plaintext
$6cc1cfb5 captured-variables.js:12:1
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Registers: 7
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Blocks: 1
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Constants:
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[0] = Undefined
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block0:
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[ 0] GetGlobal dst:reg6, `outer`
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, outer
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[ 38] End value:reg5
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outer$0300a3f9 captured-variables.js:5:5
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Registers: 7
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Blocks: 1
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Locals: inner~0
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Constants:
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[0] = Undefined
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[1] = Int32(1)
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block0:
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[ 0] GetLexicalEnvironment dst:reg4
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[ 8] Mov dst:inner~0, src:Undefined
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[ 18] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:1
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[ 28] CreateVariable `captured`, is_immutable:false, is_global:false, is_strict:false
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[ 38] NewFunction dst:inner~0, shared_function_data_index:0
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[ 50] InitializeLexicalBinding `captured`, src:Int32(1)
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[ 68] Call dst:reg6, callee:inner~0, this_value:Undefined, inner
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[ 88] Return value:reg6
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inner$f798183e captured-variables.js:7:9
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Registers: 6
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Blocks: 1
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block0:
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[ 0] GetBinding dst:reg5, `captured`
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[ 18] Return value:reg5
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