digitalmars.D.bugs - [Issue 4631] New: const array literal rebuilt on every usage
- d-bugmail puremagic.com (68/68) Aug 12 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4631
- d-bugmail puremagic.com (12/12) Sep 08 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4631
http://d.puremagic.com/issues/show_bug.cgi?id=4631 Summary: const array literal rebuilt on every usage Product: D Version: D2 Platform: Other OS/Version: Windows Status: NEW Keywords: performance, wrong-code Severity: normal Priority: P2 Component: DMD AssignedTo: nobody puremagic.com ReportedBy: r.sagitario gmx.de PDT --- This assertion in this code fails: module test; const int[] arr = [ 1, 2, 3 ]; void main() { assert(arr.ptr == arr.ptr); } Here's the assembly for main: __Dmain comdat assume CS:__Dmain L0: push EBX push ESI push 3 push 2 push 1 push 3 mov EAX,offset FLAT:_D12TypeInfo_xAi6__initZ push EAX call near ptr __d_arrayliteralT add ESP,014h mov ECX,EAX mov EBX,3 push ECX push 3 push 2 push 1 push 3 mov EDX,offset FLAT:_D12TypeInfo_xAi6__initZ push EDX call near ptr __d_arrayliteralT add ESP,014h mov ECX,EAX mov EAX,3 mov ESI,ECX pop ECX cmp ECX,ESI je L4E mov EAX,7 call near ptr _D4test8__assertFiZv L4E: xor EAX,EAX pop ESI pop EBX ret __Dmain ends The array literal is constructed on every use, even though the constant array is written to the _DATA segment of the object file. I tried increasing the array size if there is some threshold, but with about 50 elements it's still the same. using "const(int)[] arr = [ 1, 2, 3 ];" works as expected. This looks similar to bug 2237, but the code here works ok for D1 while bug 2237 is D1 only. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Aug 12 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4631 David Simcha <dsimcha yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |dsimcha yahoo.com Resolution| |DUPLICATE *** This issue has been marked as a duplicate of issue 4298 *** -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Sep 08 2010