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digitalmars.D.bugs - [Issue 8775] New: 2.059 worked 2.060 does not: Range Violation

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8775

           Summary: 2.059 worked 2.060 does not: Range Violation
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: regression
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: russel winder.org.uk



PDT ---
Created an attachment (id=1147)
pi_d_threadsGlobalState_array_iterative.d

The attached code compiles and executes fine under 2.059 on Debian Unstable
installed using the distribution deb. Using 2.060 however the following error
obtains:

core.exception.RangeError pi_d_threadsGlobalState_array_iterative(42): Range
violation
----------------
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(_d_array_bounds+0x26)
[0x4585f2]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative()
[0x453d6a]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(void
pi_d_threadsGlobalState_array_iterative.execute(immutable(int))+0xc3)
[0x44bd6f]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(_Dmain+0x28)
[0x44bf4c]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(extern
(C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x458dc4]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(extern
(C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate())+0x2a)
[0x45873e]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(extern
(C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x458e0b]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(extern
(C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate())+0x2a)
[0x45873e]
/tmp/.rdmd-1000/rdmd-pi_d_threadsGlobalState_array_iterative.d-78EB353AE451236DB347EDE2878B2CA4/pi_d_threadsGlobalState_array_iterative(main+0xd1)
[0x4586c9]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7fb55551bead]

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8775


Alex Rønne Petersen <alex lycus.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alex lycus.org



CEST ---
pi_d_threadsGlobalState_array_iterative.d(13): Error: module output_d is in
file 'output_d.d' which cannot be read
import path[0] = .
import path[1] = /usr/include/dmd/phobos
import path[2] = /usr/include/dmd/druntime/import
Failed: 'dmd' '-v' '-o-' 'pi_d_threadsGlobalState_array_iterative.d' '-I.'

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PDT ---
Created an attachment (id=1149)
output_d.d

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Alex Rønne Petersen <alex lycus.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|druntime                    |DMD



CEST ---
What's breaking here is that on line 42, 'i' is somehow a ridiculous value like
-550993920 (during the first run with numberOfThreads = 1 at least). Definitely
a compiler bug.

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CEST ---
FWIW, changing the foreach loop to a for loop makes the code run (presumably
correctly; I didn't actually look at what it's supposed to do).

======================== pi_d_threadsGlobalState_array_iterative.d, task count:
1
    π = 3.141592653589970752
    iteration count = 1000000000
    elapse time = 6.938375
    number of processors = 8
======================== pi_d_threadsGlobalState_array_iterative.d, task count:
2
    π = 3.141592653589901030
    iteration count = 1000000000
    elapse time = 3.563860
    number of processors = 8
======================== pi_d_threadsGlobalState_array_iterative.d, task count:
8
    π = 3.141592653589769135
    iteration count = 1000000000
    elapse time = 1.716047
    number of processors = 8
======================== pi_d_threadsGlobalState_array_iterative.d, task count:
32
    π = 3.141592653589757589
    iteration count = 1000000000
    elapse time = 1.609829
    number of processors = 8

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PDT ---
Perhaps worth noting that this code compiles and runs fine using ldc2 compiled
from the Git repository.

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PDT ---


 FWIW, changing the foreach loop to a for loop makes the code run (presumably
 correctly; I didn't actually look at what it's supposed to do).


It is supposed to do exactly what you made it do :-) That is calculate
approximations to π for a number of different thread counts – to check
whether
there is close to linear scaling for this embarrassingly parallel problem.

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Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE



*** This issue has been marked as a duplicate of issue 8526 ***

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