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Bug 11159 – [CTFE] Integer exponentiation give incorrect values

Status: RESOLVED
Resolution: FIXED
Severity: normal
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2013-10-02T16:31:00Z
Last change time: 2013-10-04T12:10:13Z
Keywords: CTFE, patch, pull
Assigned to: nobody
Creator: safety0ff.bugz

Attachments

ID	Filename	Summary	Content-Type	Size
1255	0001-Fix-ctfe-integer-exponentiation.patch	Proposed fix	text/plain	1549

Comments

Comment #0 by safety0ff.bugz — 2013-10-02T16:31:54Z

Example program: import std.stdio; void main() { writeln("==== Runtime ===="); ulong ten = 10, two = 2; writeln(two^^63);// ok writeln(two^^64);// overflows -> 2^64 % 2^64 writeln(ten^^18);// ok writeln(ten^^19);// ok writeln(ten^^20);// overflows -> 10^20 % 2^64 writeln("==== CTFE ===="); enum ulong eten = 10, etwo = 2; writeln(etwo^^63);// ok writeln(etwo^^64);// expect an overflow, gives 2^63 writeln(eten^^18);// ok writeln(eten^^19);// should work, gives 2^63 instead (2^63 > 10^19) writeln(eten^^20);// expect an overflow, gives 2^63 } See attached patch for proposed fix.

Comment #1 by safety0ff.bugz — 2013-10-02T16:32:46Z

Created attachment 1255 Proposed fix

Comment #2 by safety0ff.bugz — 2013-10-02T22:18:12Z

Patch fixes issue 7548, one issue should be marked duplicate of the other.

Comment #3 by safety0ff.bugz — 2013-10-03T07:52:33Z

https://github.com/D-Programming-Language/dmd/pull/2623

Comment #4 by bugzilla — 2013-10-03T22:57:15Z

*** Issue 7548 has been marked as a duplicate of this issue. ***