topic I am just glad I was able to in Intel® Fortran Compiler

Potential loop unrolling bug in ComposerXE 2013

Marianne_S_ — Fri, 01 Feb 2013 15:26:53 GMT

I have found a potential bug with the loop unrolling of a triangular loop. The example is attached.

[marianne@MarianneFedora15 ~]$ ifort -v
ifort version 13.0.1

[marianne@MarianneFedora15 ~]$ ifort loopUnrolltest.f90
[marianne@MarianneFedora15 ~]$ ./a.out
1000000. 1000000. 3.3835000E+07 0.0000000E+00 0.0000000E+00
0.0000000E+00
[marianne@MarianneFedora15 ~]$ ifort -unroll0 loopUnrolltest.f90
[marianne@MarianneFedora15 ~]$ ./a.out
3.3835000E+07 3.3835000E+07 3.3835000E+07 3.3835000E+07 3.3835000E+07
3.3835000E+07

I'll have a look and get a

Ron_Green — Fri, 01 Feb 2013 16:12:00 GMT

Bug report entered. We will inform you when a fix gets into the compiler.

Thank you for such a good concise reproducer! This really helps us.

ron

I am just glad I was able to

Marianne_S_ — Fri, 01 Feb 2013 17:54:10 GMT

I am just glad I was able to actually reproduce it separately from our main code. That does not usually happen!

Thanks for submitting the bug report.

Is it possible to get a

Marianne_S_ — Tue, 26 Feb 2013 14:45:59 GMT

Is it possible to get a ticket number or something for this issue? My management has asked me for one. I had issues logging into the premier support to submit this myself which is why I posted it here in the first place.

The internal bug report id

Kevin_D_Intel — Tue, 26 Feb 2013 17:51:31 GMT

The internal bug report id Ron filed for the issue is DPD200240713

this bug was fixed in

Ron_Green — Wed, 24 Jul 2013 22:45:13 GMT

this bug was fixed in Composer XE 2013 Update 3, aka 13.1.1.163 build 20130313.

thank you for reporting this bug.

ron