[llvm-dev] LLC Segmentation Fault in Matrix Multiplication

[hameeza ahmed via llvm-dev]

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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