https://llvm.org/bugs/show_bug.cgi?id=30992
Bug ID: 30992
Summary: AVX512: _mm_loadu_ps alignment issue
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: roland.sch...@intel.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
_mm_loadu_ps segfaults on unaligned memory address because it gets optimized to
aligned load (vmovaps). Simple unit tests pass so I'm not sure how to generate
a simple reproducer.
Steps to reproduce:
git clone -b clang https://github.com/rolandschulz/gromacs.git
cd gromacs
mkdir build
cd build
CFLAGS=-g CXXFLAGS=-g CC=clang CXX=clang++ cmake -DGMX_SIMD=AVX_512_KNL
-DGMX_BUILD_HELP=OFF -DBUILD_SHARED_LIBS=no ..
make -j20 gmx
./bin/gmx mdrun -s ../topol.tpr -nt 1
Segfault at:
asm> vmovaps (%r11,%r8,4),%xmm6
src> gri_S3 = load4U(grid+index_x+(j0+3)*pnz+k0);
(gdb) p/x $r11+$r8*4
$2 = 0x7ffff7e64914
load4U is a simple wrapper:
static inline Simd4Float gmx_simdcall
load4U(const float *m) {
return { _mm_loadu_ps(m) };
}
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