Did you ever figure this out?
I just hit the same failure locally.
And there's also a bug field about it:
https://bugs.llvm.org/show_bug.cgi?id=32910
On Fri, Jun 9, 2017 at 1:00 PM, Csaba Raduly via llvm-dev
<llvm-dev at lists.llvm.org> wrote:> I debugged divsc3_test.c
>
> The test fails at i=0 , j=42
>
> test__divsc3 (a=9.99999997e-07, b=9.99999997e-07, c=-0.5, d=-2)
> r = -5.88235309e-07 + 3.52941186e-07 * I
>
> classify (x=9.99999997e-07 + 9.99999997e-07 * I) => 1 (non_zero)
> classify (x=-0.5 + -2 * I) => 1 (non_zero)
>
> classify (x=-5.88235309e-07 + 3.52941186e-07 * I) => 1 (non_zero)
>
> z =-5.88235253e-07 + 3.52941186e-07 * I
> r =-5.88235309e-07 + 3.52941186e-07 * I
>
> which indeed is not equal to r
>
> This is Ubuntu 14.04 LTS
> $ uname -a
> Linux 3.13.0-119-generic #166-Ubuntu SMP Wed May 3 12:18:55 UTC 2017
> x86_64 x86_64 x86_64 GNU/Linux
>
> /proc/cpuinfo
> processor : 7
> vendor_id : GenuineIntel
> cpu family : 6
> model : 58
> model name : Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
> stepping : 9
> microcode : 0x19
> cpu MHz : 3401.000
> cache size : 8192 KB
> physical id : 0
> siblings : 8
> core id : 3
> cpu cores : 4
> apicid : 7
> initial apicid : 7
> fpu : yes
> fpu_exception : yes
> cpuid level : 13
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
> xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
> ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic
> popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm ida arat
> epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid
> fsgsbase smep erms
> bogomips : 6784.49
> clflush size : 64
> cache_alignment : 64
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
> clang was built with the built-in gcc:
>
> gcc version 4.8.5 (Ubuntu 4.8.5-2ubuntu1~14.04.1)
>
>
> Csaba
> --
> GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
> The Tao of math: The numbers you can count are not the real numbers.
> Life is complex, with real and imaginary parts.
> "Ok, it boots. Which means it must be bug-free and perfect. " --
Linus Torvalds
> "People disagree with me. I just ignore them." -- Linus Torvalds
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