mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-11 17:37:33 +02:00
51758f3022
Generator::allocate_register used to scan the free pool to find the lowest-numbered register and then Vec::remove it, making every allocation O(n) in the size of the pool. When loading https://x.com/ on my Linux machine, we spent ~800ms in this function alone! This logic only existed to match the C++ register allocation ordering while transitioning from C++ to Rust in the LibJS compiler, so now we can simply get rid of it and make it instant. :^) So drop the "always hand out the lowest-numbered free register" policy and use the pool as a plain LIFO stack. Pushing and popping the back of the Vec are both O(1), and peak register usage is unchanged since the policy only affects which specific register gets reused, not how aggressively.
129 lines
3.0 KiB
Plaintext
129 lines
3.0 KiB
Plaintext
$058cd786 nested-try-finally-continue.js:14:1
|
|
Registers: 7
|
|
Blocks: 1
|
|
Constants:
|
|
[0] = Undefined
|
|
|
|
block0:
|
|
[ 0] GetGlobal dst:reg6, `nestedTryFinallyContinue`
|
|
[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, nestedTryFinallyContinue
|
|
[ 38] End value:reg5
|
|
|
|
|
|
nestedTryFinallyContinue$f4bfe0d3 nested-try-finally-continue.js:2:5
|
|
Registers: 13
|
|
Blocks: 24
|
|
Locals: i~0
|
|
Constants:
|
|
[0] = Int32(0)
|
|
[1] = Int32(3)
|
|
[2] = Int32(1)
|
|
[3] = String("inner")
|
|
[4] = Int32(2)
|
|
[5] = Undefined
|
|
[6] = String("outer")
|
|
|
|
block0:
|
|
[ 0] GetLexicalEnvironment dst:reg4
|
|
[ 8] Mov dst:i~0, src:Int32(0)
|
|
[ 18] Jump target:block3
|
|
|
|
block1:
|
|
[ 20] Jump target:block7
|
|
|
|
block2:
|
|
[ 28] PostfixIncrement dst:reg5, src:i~0
|
|
|
|
block3:
|
|
[ 38] JumpLessThan lhs:i~0, rhs:Int32(3), true_target:block1, false_target:block4
|
|
|
|
block4:
|
|
[ 50] End value:Undefined
|
|
|
|
block5:
|
|
[ 58] Catch dst:reg6
|
|
[ 60] SetLexicalEnvironment environment:reg4
|
|
[ 68] Mov dst:reg5, src:Int32(1)
|
|
|
|
block6:
|
|
[ 78] GetGlobal dst:reg8, `console`
|
|
[ 90] GetById dst:reg9, base:reg8, `log` (console.log)
|
|
[ b0] Mov dst:reg11, src:i~0
|
|
[ c0] Call dst:reg7, callee:reg9, this_value:reg8, console.log, arguments:[String("outer"), reg11]
|
|
[ e8] JumpStrictlyEquals lhs:reg5, rhs:Int32(0), true_target:block19, false_target:block20
|
|
|
|
block7:
|
|
[ 100] Jump target:block10
|
|
|
|
block8:
|
|
[ 108] Catch dst:reg8
|
|
[ 110] SetLexicalEnvironment environment:reg4
|
|
[ 118] Mov dst:reg7, src:Int32(1)
|
|
|
|
block9:
|
|
[ 128] GetGlobal dst:reg10, `console`
|
|
[ 140] GetById dst:reg11, base:reg10, `log` (console.log)
|
|
[ 160] Mov dst:reg12, src:i~0
|
|
[ 170] Call dst:reg9, callee:reg11, this_value:reg10, console.log, arguments:[String("inner"), reg12]
|
|
[ 198] JumpStrictlyEquals lhs:reg7, rhs:Int32(0), true_target:block14, false_target:block15
|
|
|
|
block10:
|
|
[ 1b0] JumpStrictlyEquals lhs:i~0, rhs:Int32(1), true_target:block11, false_target:block12
|
|
|
|
block11:
|
|
[ 1c8] Mov dst:reg7, src:Int32(3)
|
|
[ 1d8] Jump target:block9
|
|
|
|
block12:
|
|
[ 1e0] Mov dst:reg7, src:Int32(0)
|
|
[ 1f0] Jump target:block9
|
|
|
|
block13:
|
|
[ 1f8] Mov dst:reg5, src:Int32(3)
|
|
[ 208] Jump target:block6
|
|
|
|
block14:
|
|
[ 210] Mov dst:reg5, src:Int32(0)
|
|
[ 220] Jump target:block6
|
|
|
|
block15:
|
|
[ 228] JumpStrictlyEquals lhs:reg7, rhs:Int32(3), true_target:block13, false_target:block16
|
|
|
|
block16:
|
|
[ 240] JumpStrictlyEquals lhs:reg7, rhs:Int32(2), true_target:block17, false_target:block18
|
|
|
|
block17:
|
|
[ 258] Mov2 dst1:reg5, src1:reg7, dst2:reg6, src2:reg8
|
|
[ 270] Jump target:block6
|
|
|
|
block18:
|
|
[ 278] Throw src:reg8
|
|
|
|
block19:
|
|
[ 280] Jump target:block2
|
|
|
|
block20:
|
|
[ 288] JumpStrictlyEquals lhs:reg5, rhs:Int32(3), true_target:block2, false_target:block21
|
|
|
|
block21:
|
|
[ 2a0] JumpStrictlyEquals lhs:reg5, rhs:Int32(2), true_target:block22, false_target:block23
|
|
|
|
block22:
|
|
[ 2b8] Return value:reg6
|
|
|
|
block23:
|
|
[ 2c0] Throw src:reg6
|
|
|
|
Exception handlers:
|
|
[ 100 .. 1b0] => handler block5
|
|
[ 1b0 .. 210] => handler block8
|
|
[ 210 .. 280] => handler block5
|
|
|
|
|
|
"inner" 0
|
|
"outer" 0
|
|
"inner" 1
|
|
"outer" 1
|
|
"inner" 2
|
|
"outer" 2
|