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Bug 16027 – Wrong result of double multiplication

Status: RESOLVED
Resolution: FIXED
Severity: regression
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: x86_64
OS: Linux
Creation time: 2016-05-15T14:12:00Z
Last change time: 2016-05-18T03:19:46Z
Assigned to: nobody
Creator: schuetzm

Comments

Comment #0 by schuetzm — 2016-05-15T14:12:09Z

void main() { double value = 1.0; value *= -1.0; assert(value == -1.0); // fails, value is +1.0 value = 1.0; value = value * -1.0; assert(value == -1.0); } This is a regression introduced by this PR: https://github.com/dlang/dmd/pull/5534 Reported by a user here: https://forum.dlang.org/post/[email protected]

Comment #1 by temtaime — 2016-05-15T18:31:01Z

Seems all the backend "improvements" lead to the regressions

Comment #2 by bugzilla — 2016-05-15T19:44:38Z

https://github.com/dlang/dmd/pull/5781

Comment #3 by github-bugzilla — 2016-05-17T02:13:53Z

Commits pushed to stable at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/86b6999759d18f5c2467c31b19a682c02bed9173 fix Issue 16027 - Wrong result of double multiplication https://github.com/dlang/dmd/commit/f8d82257d15e75536b448651826eaf758e2eb584 Merge pull request #5786 from MartinNowak/fix16027 fix Issue 16027 - Wrong result of double multiplication

Comment #4 by thomas.bockman — 2016-05-18T02:31:51Z

*** Issue 16038 has been marked as a duplicate of this issue. ***

Comment #5 by thomas.bockman — 2016-05-18T02:32:21Z

We need the fix for this in master, also.

Comment #6 by github-bugzilla — 2016-05-18T03:19:46Z

Commits pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/86b6999759d18f5c2467c31b19a682c02bed9173 fix Issue 16027 - Wrong result of double multiplication https://github.com/dlang/dmd/commit/f8d82257d15e75536b448651826eaf758e2eb584 Merge pull request #5786 from MartinNowak/fix16027