Add optimized ParseUint - #128
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Summary of Changes
Hello @ReneWerner87, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a custom, highly optimized utility function for parsing unsigned integers, aiming to provide a faster alternative to the standard library's strconv.ParseUint. It includes thorough testing and benchmarking to validate its correctness and demonstrate its performance benefits, with the results documented for easy reference.
Highlights
- Performance Optimization: Introduced a new
ParseUintfunction designed to parse unsigned integers more efficiently than the standard library'sstrconv.ParseUint. - Benchmarking & Validation: Added comprehensive benchmarks comparing the new
ParseUintfunction's performance againststrconv.ParseUint, demonstrating significant speed improvements. - Documentation Update: Updated the
README.mdto include the benchmark results, providing clear evidence of the performance gains achieved by the new parsing function.
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Code Review
The pull request introduces an optimized ParseUint function for parsing unsigned integers, along with benchmarks and tests. A potential improvement is suggested to simplify the overflow check in the ParseUint function for better readability and performance.
| if n > maxUint64Div10 || (n == maxUint64Div10 && uint64(c-'0') > maxUint64Mod10) { | ||
| return 0, strconv.ErrRange |
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The overflow check can be simplified by combining the conditions into a single check. This improves readability and might slightly improve performance by avoiding the second condition check when the first one fails.
| if n > maxUint64Div10 || (n == maxUint64Div10 && uint64(c-'0') > maxUint64Mod10) { | |
| return 0, strconv.ErrRange | |
| if n > maxUint64Div10 || n*10 > maxUint64-uint64(c-'0') { | |
| return 0, strconv.ErrRange | |
| } |
| // ParseUint parses a decimal ASCII representation of an unsigned integer. | ||
| // It returns an error if the input contains non-digit characters or | ||
| // the value overflows uint64. | ||
| func ParseUint[S ~string | ~[]byte](s S) (uint64, error) { |
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Could we do the same by adding ParseInt() ?
| } | ||
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| func Benchmark_ParseUint(b *testing.B) { | ||
| str := "1234567890" |
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This value falls under Int, not Uint. It's too small
2 participants
Summary
ParseUintfor parsing unsigned integers faster thanstrconv.ParseUintTesting
go test ./... -run . -count=1go test ./... -bench=ParseUint -benchmem -run=^$ -count=2https://chatgpt.com/codex/tasks/task_e_686e19a07664832684ed066f531079c6