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Bug 12798 – constant folding should optimize subsequent concatenations

Status: RESOLVED
Resolution: FIXED
Severity: enhancement
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2014-05-25T02:05:00Z
Last change time: 2014-05-25T18:25:31Z
Keywords: performance, pull
Assigned to: nobody
Creator: k.hara.pg

Comments

Comment #0 by k.hara.pg — 2014-05-25T02:05:53Z

This is front-end optimizer issue. Preceding concatenations of string literals will be optimized to one long literal. string x; string y = "a" ~ "b" ~ x; // optimized to "ab" ~ x But subsequent one doesn't. string z = x ~ "a" ~ "b"; // not optimized to x ~ "ab"

Comment #1 by k.hara.pg — 2014-05-25T02:55:25Z

https://github.com/D-Programming-Language/dmd/pull/3581

Comment #2 by github-bugzilla — 2014-05-25T18:25:31Z

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/5920f0953c9e7f4683d8c6f90a15497c95870076 fix Issue 12798 - constant folding should optimize subsequent concatenations https://github.com/D-Programming-Language/dmd/commit/99ccc90d669d92af80a55a509abfc09e1cafac8e Merge pull request #3581 from 9rnsr/fix12798 Issue 12798 - constant folding should optimize subsequent concatenations