9119d16904
Equality with null/undefined is equivalent to a check on the undetectable bit on the map of the object. This would be more efficient than performing the entire comparison operation. This cl introduces: 1. A new bytecode called TestUndetectable that checks if the object is null/undefined. 2. Updates peeophole optimizer to emit TestUndetectable when a LdaNull/Undefined precedes equality check. 4. TestUndetectable is transformed to ObjectIsUndetectable operator when building turbofan graph. BUG=v8:4280 Review-Url: https://codereview.chromium.org/2547043002 Cr-Commit-Position: refs/heads/master@{#41514}
124 lines
2.5 KiB
Plaintext
124 lines
2.5 KiB
Plaintext
#
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# Autogenerated by generate-bytecode-expectations.
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#
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---
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wrap: yes
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---
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snippet: "
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var obj_a = {val:1};
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var b = 10;
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if (obj_a == null) { b = 20;}
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return b;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 24
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
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B(Mov), R(2), R(0),
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/* 63 S> */ B(LdaSmi), U8(10),
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B(Star), R(1),
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/* 67 S> */ B(TestUndetectable), R(0),
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B(JumpIfFalse), U8(6),
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/* 88 S> */ B(LdaSmi), U8(20),
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B(Star), R(1),
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/* 97 S> */ B(Ldar), R(1),
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/* 107 S> */ B(Return),
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]
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constant pool: [
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FIXED_ARRAY_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var obj_a = {val:1};
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var b = 10;
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if (obj_a == undefined) { b = 20;}
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return b;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 24
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
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B(Mov), R(2), R(0),
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/* 63 S> */ B(LdaSmi), U8(10),
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B(Star), R(1),
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/* 67 S> */ B(TestUndetectable), R(0),
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B(JumpIfFalse), U8(6),
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/* 93 S> */ B(LdaSmi), U8(20),
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B(Star), R(1),
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/* 102 S> */ B(Ldar), R(1),
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/* 112 S> */ B(Return),
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]
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constant pool: [
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FIXED_ARRAY_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var obj_a = {val:1};
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var b = 10;
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if (obj_a != null) { b = 20;}
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return b;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 24
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
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B(Mov), R(2), R(0),
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/* 63 S> */ B(LdaSmi), U8(10),
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B(Star), R(1),
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/* 67 S> */ B(TestUndetectable), R(0),
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B(JumpIfTrue), U8(6),
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/* 88 S> */ B(LdaSmi), U8(20),
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B(Star), R(1),
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/* 97 S> */ B(Ldar), R(1),
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/* 107 S> */ B(Return),
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]
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constant pool: [
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FIXED_ARRAY_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var obj_a = {val:1};
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var b = 10;
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if (obj_a != undefined) { b = 20;}
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return b;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 24
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
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B(Mov), R(2), R(0),
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/* 63 S> */ B(LdaSmi), U8(10),
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B(Star), R(1),
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/* 67 S> */ B(TestUndetectable), R(0),
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B(JumpIfTrue), U8(6),
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/* 93 S> */ B(LdaSmi), U8(20),
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B(Star), R(1),
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/* 102 S> */ B(Ldar), R(1),
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/* 112 S> */ B(Return),
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]
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constant pool: [
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FIXED_ARRAY_TYPE,
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]
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handlers: [
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]
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