[llvm-dev] LLC Segmentation Fault in Matrix Multiplication

[hameeza ahmed via llvm-dev]

It happens only when i keep my vector width to >=64, why is that so?

I have to keep it >=64. Please suggest some way?

On Sat, Jul 1, 2017 at 10:47 AM, hameeza ahmed <hahmed2305 at gmail.com> wrote:

> Hello,
>
> when i used clang for matrix multiplication code with i=j=k=1000351, it
> successfully generates IR. then i run opt as follows
> opt  -S -O3 -force-vector-width=64 -force-vector-interleave=32 matn.ll -o
> pimmatnl_64_u32_o3.ll
>
> it also worked fine. but when i run llc on the optimized .ll file
>
> llc -x86-asm-syntax=intel pimmatnl_64_u32_o3.ll -o matnl-knl4_intel.s
>
> i get the following segmentation fault error:
>
> #0 0x0000000001826ad8 (llc+0x1826ad8)
> #1 0x0000000001824aae (llc+0x1824aae)
> #2 0x0000000001824bfc (llc+0x1824bfc)
> #3 0x00007fa6bdb52d10 __restore_rt (/lib/x86_64-linux-gnu/
> libpthread.so.0+0x10d10)
> #4 0x00000000014d0974 (llc+0x14d0974)
> #5 0x000000000169bdb5 (llc+0x169bdb5)
> #6 0x00000000016bcfdc (llc+0x16bcfdc)
> #7 0x00000000016d8684 (llc+0x16d8684)
> #8 0x000000000170a4c0 (llc+0x170a4c0)
> #9 0x000000000171199d (llc+0x171199d)
> #10 0x0000000001714258 (llc+0x1714258)
> #11 0x0000000000e530f4 (llc+0xe530f4)
> #12 0x000000000122c931 (llc+0x122c931)
> #13 0x0000000001499b2a (llc+0x1499b2a)
> #14 0x0000000001499bd3 (llc+0x1499bd3)
> #15 0x0000000001499694 (llc+0x1499694)
> #16 0x000000000068a68c (llc+0x68a68c)
> #17 0x0000000000626a80 (llc+0x626a80)
> #18 0x00007fa6bccf3a40 __libc_start_main (/lib/x86_64-linux-gnu/libc.
> so.6+0x20a40)
> #19 0x000000000067f8e9 (llc+0x67f8e9)
> Stack dump:
> 0. Program arguments: llc -x86-asm-syntax=intel pimmatnl_64_u32_o3.ll -o
> matnl-knl4_intel.s
> 1. Running pass 'Function Pass Manager' on module 'pimmatnl_64_u32_o3.ll'.
> 2. Running pass 'X86 DAG->DAG Instruction Selection' on function
> '@multiply'
> Segmentation fault (core dumped)
>
> Why does it happen? please correct me.
>
> Thank You
>
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