This is expected failure since this patch is not in sync with the latest patches related to masking support for AVX512. I am waiting for support for masking load/store support which is not integrated to trunk. To get workable version of compiler use revision before r229128.
2015-11-03 13:08 GMT+03:00 Richard Henderson <r...@redhat.com>: > On 10/28/2015 11:45 AM, Yuri Rumyantsev wrote: >> >> Hi All, >> >> Here is a preliminary patch to combine vectorized loop with its scalar >> remainder, draft of which was proposed by Kirill Yukhin month ago: >> https://gcc.gnu.org/ml/gcc-patches/2015-09/msg01435.html >> It was tested wwith '-mavx2' option to run on Haswell processor. >> The main goal of it is to improve performance of vectorized loops for >> AVX512. > > > Ought this really be enabled for avx2? While it's nice for testing to be > able to use normal vcond patterns to be able to test with current hardware, > I have trouble imagining that it's an improvement without the real masked > operations. > > I tried to have a look myself at what kind of output we'd be getting, but > the very first test I tried produced an ICE: > > void foo(float *a, float *b, int n) > { > int i; > for (i = 0; i < n; ++i) > a[i] += b[i]; > } > > $ ./cc1 -O3 -mavx2 z.c > foo > Analyzing compilation unit > Performing interprocedural optimizations > <*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes> > <free-inline-summary> <whole-program> <profile_estimate> <icf> <devirt> <cp> > <targetclone> <inline> <pure-const> <static-var> <single-use> > <comdats>Assembling functions: > <dispachercalls> foo > z.c: In function ‘foo’: > z.c:1:6: error: bogus comparison result type > void foo(float *a, float *b, int n) > ^ > vector(8) signed int > vect_vec_mask_.24_116 = vect_vec_iv_.22_112 < vect_cst_.23_115; > z.c:1:6: internal compiler error: verify_gimple failed > 0xb20d17 verify_gimple_in_cfg(function*, bool) > ../../git-master/gcc/tree-cfg.c:5082 > 0xa16d77 execute_function_todo > ../../git-master/gcc/passes.c:1940 > 0xa1769b execute_todo > ../../git-master/gcc/passes.c:1995 > Please submit a full bug report, > > > r~
