floating point exception

[Richard_D_2]

The attached very simple program crashed when compiled with icc (icc version 15.0.2 (gcc version 4.9.0 compatibility)), under Ubuntu 14.10.

Step to reproduce

1. Download the attached source file bug.c
2. Compile it: icc bug.c -o bug
3. Execute it: bug
4. Result:

0 1 -> 1
Floating point exception (core dumped)

When compiled with other compilers as gcc or clang, the program behaves as expected, without crashing. The source code does not contain any floating point variable.

--

Richard Delorme

[pbkenned1]

Thank you for reporting the issue.  It appears to be an -O2 (or higher) optimization bug (-O0/-O1 work fine).  We'll investigate and follow up.

Patrick

[pbkenned1]

This has been reported to the developers, internal tracking ID DPD200366334.  I'll keep this thread updated with any news.

Patrick

[pbkenned1]

This issue is fixed in PSXE 2016 update #1, so I'm closing this ticket now. 

Patrick

C:\ISN_Forums\U540788>icl -O2 bug.c
Intel(R) C++ Intel(R) 64 Compiler for applications running on Intel(R) 64, Version 16.0.1.146 Build 20151021
Copyright (C) 1985-2015 Intel Corporation.  All rights reserved.

bug.c
Microsoft (R) Incremental Linker Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

-out:bug.exe
bug.obj

C:\ISN_Forums\U540788>bug.exe

0 1 -> 1
0 2 -> 1
0 3 -> 1
0 4 -> 1
0 5 -> 1
0 6 -> 1
0 7 -> 1
0 8 -> 8
0 16 -> 8
0 24 -> 8
0 32 -> 8
0 40 -> 8
0 48 -> 8
0 56 -> 8
0 9 -> 9
0 18 -> 9
0 27 -> 9
0 36 -> 9
0 45 -> 9
0 54 -> 9
0 63 -> 9

[SNIP]

63 62 -> 1
63 61 -> 1
63 60 -> 1
63 59 -> 1
63 58 -> 1
63 57 -> 1
63 56 -> 1
done

C:\ISN_Forums\U540788>