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View Code? Open in Web Editor NEWPortable 128-bit SIMD intrinsics
License: MIT License
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__builtin_shuffle not supported in icc
The title says it all. icc fails with this message:
error: "__builtin_shuffle" is not supported
Any chance of getting an alternative implementation for icc? This impacts the compilation of pytorch with the intel compiler, making it essentially not possible.
Support portable vector alignment
Different vector units handle alignment in interesting ways. ARM/NEON supports fixing up unaligned accesses at runtime, or trapping on them depending on the instruction alignment specifier. PowerPC/Altivec however silently loads/stores...somewhere slightly different, which causes all manner of problems if an unaligned address makes it to the Altivec load/store unit.
Currently, GCC9 on PowerPC ignores the Altivec execution unit entirely when using PSIMD, this appears to be because aligned(N) has N set to at most 4 bytes, but the Altivec unit require 16 byte alignment before it can safely load/store vectors. Increasing N to 16 results in AltiVec instructions being used; however, much code using PSIMD isn't written to align its memory. For example, NNPACK fails the convolution tests.
I think this is because the psimd_(load|store)_ family of instructions aren't alignment-aware and support load/store to native C types, which may not be aligned to the requirements of a vector unit.
I'm not sure what the right solution would be, perhaps some combination of:
- adding a platform-recommended alignment so api callers can align their buffers to use
- adding some load/store aligned functions
- fixing up the current load/store functions to handle unaligned accesses in software on platforms that require it
error compiling on Ubuntu 17.10
Trying to compile NNPACK I get the following psimd error on ubuntu 17.10
/usr/bin/cc -DNNP_BACKEND_PSIMD=1 -DNNP_CONVOLUTION_ONLY=0 -DNNP_INFERENCE_ONLY=1 -Iinclude -Isrc -Ideps/cpuinfo/include -Ideps/pthreadpool/include -Ideps/fxdiv/include -Ideps/psimd/include -Ideps/fp16/include -std=gnu99 -MD -MT CMakeFiles/nnpack.dir/src/psimd/softmax.c.o -MF CMakeFiles/nnpack.dir/src/psimd/softmax.c.o.d -o CMakeFiles/nnpack.dir/src/psimd/softmax.c.o -c src/psimd/softmax.c
In file included from src/psimd/softmax.c:10:0:
src/psimd/exp.h: In function 'psimd_exp_f32':
src/psimd/exp.h:45:1: error: unrecognizable insn:
}
^
(insn 169 168 170 2 (set (reg:V4SI 126 [ _89 ])
(gt:V4SI (reg:V4SI 227)
(mem/c:V4SI (plus:DI (reg/f:DI 82 virtual-stack-vars)
(const_int -64 [0xffffffffffffffc0])) [2 b+0 S16 A32]))) "deps/psimd/include/psimd.h":669 -1
(nil))
src/psimd/exp.h:45:1: internal compiler error: in extract_insn, at recog.c:2311
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
[19/51] Building C object CMakeFiles/nnpack.dir/src/psimd/blas/shdotxf.c.o
FAILED: CMakeFiles/nnpack.dir/src/psimd/blas/shdotxf.c.o
/usr/bin/cc -DNNP_BACKEND_PSIMD=1 -DNNP_CONVOLUTION_ONLY=0 -DNNP_INFERENCE_ONLY=1 -Iinclude -Isrc -Ideps/cpuinfo/include -Ideps/pthreadpool/include -Ideps/fxdiv/include -Ideps/psimd/include -Ideps/fp16/include -std=gnu99 -MD -MT CMakeFiles/nnpack.dir/src/psimd/blas/shdotxf.c.o -MF CMakeFiles/nnpack.dir/src/psimd/blas/shdotxf.c.o.d -o CMakeFiles/nnpack.dir/src/psimd/blas/shdotxf.c.o -c src/psimd/blas/shdotxf.c
src/psimd/blas/shdotxf.c: In function 'nnp_shdotxf1__psimd':
src/psimd/blas/shdotxf.c:33:1: error: unrecognizable insn:
}
^
(insn 200 199 201 5 (set (reg:V4SI 116 [ _104 ])
(gt:V4SI (reg:V4SI 247)
(mem/c:V4SI (plus:DI (reg/f:DI 82 virtual-stack-vars)
(const_int -416 [0xfffffffffffffe60])) [2 b+0 S16 A32]))) "deps/psimd/include/psimd.h":669 -1
(nil))
src/psimd/blas/shdotxf.c:33:1: internal compiler error: in extract_insn, at recog.c:2311```
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