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[SR-5093] Reduce time needed to compile this snippet containing Array of Array #47669

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jepers opened this issue Jun 6, 2017 · 0 comments
Closed

[SR-5093] Reduce time needed to compile this snippet containing Array of Array #47669

jepers opened this issue Jun 6, 2017 · 0 comments
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compiler The Swift compiler in itself improvement performance type checker Area → compiler: Semantic analysis

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@jepers
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jepers commented Jun 6, 2017

Previous ID SR-5093
Radar None
Original Reporter @jepers
Type Improvement
Status Closed
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, Performance, TypeChecker
Assignee None
Priority Medium

md5: e8b99935eb1e60a22076965033e72273

Issue Description:

Tested with Xcode 8.3 default toolchain (Swift 3.1) and also dev snapshot 2017-06-02 (Swift 4), both are exceptionally slow at compiling this program (8 seconds on my MBP):

var maa = [[Int]]()
let i = 1
let j = 2
#if HELPING_TYPE_CHECKER
    let a = maa[i + 1][j - 1]
    let b = maa[i - 1][j + 1]
    maa[i][j] = a + b
#else
    maa[i][j] = maa[i + 1][j - 1] + maa[i - 1][j + 1]
#endif

$ time swiftc -D HELPING_TYPE_CHECKER test.swift
real    0m0.151s
user    0m0.114s
sys 0m0.024s

$ time swiftc test.swift
real    0m8.595s
user    0m8.277s
sys 0m0.302s
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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compiler The Swift compiler in itself improvement performance type checker Area → compiler: Semantic analysis
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@jepers