Re: [PATCH 1/4] Relax COND_EXPR reduction vectorization SLP restriction

[Kugan Vivekanandarajah <kuganviv@gmail.com>]

Hi Richard,

This seems to have introduced a regression. I am seeing ICE while
building TSVC_2 for AARCH64
with -O3 -flto -mcpu=neoverse-v2 -msve-vector-bits=128

tsvc.c: In function 's331':
tsvc.c:2744:8: internal compiler error: Segmentation fault
 2744 | real_t s331(struct args_t * func_args)
      |        ^
0xdfc23b crash_signal
        /var/jenkins/workspace/GCC_Nightly/gcc/toplev.cc:319
0xa3a6f8 phi_nodes_ptr(basic_block_def*)
        /var/jenkins/workspace/GCC_Nightly/gcc/gimple.h:4701
0xa3a6f8 gsi_start_phis(basic_block_def*)
        /var/jenkins/workspace/GCC_Nightly/gcc/gimple-iterator.cc:937
0xa3a6f8 gsi_for_stmt(gimple*)
        /var/jenkins/workspace/GCC_Nightly/gcc/gimple-iterator.cc:621
0x1e5f22f vectorizable_condition
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-stmts.cc:12577
0x1e7a027 vect_transform_stmt(vec_info*, _stmt_vec_info*,
gimple_stmt_iterator*, _slp_tree*, _slp_instance*)
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-stmts.cc:13467
0x1112653 vect_schedule_slp_node
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-slp.cc:9729
0x1127757 vect_schedule_slp_node
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-slp.cc:9522
0x1127757 vect_schedule_scc
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-slp.cc:10017
0x11285ff vect_schedule_slp(vec_info*, vec<_slp_instance*, va_heap,
vl_ptr> const&)
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-slp.cc:10110
0x10f56b7 vect_transform_loop(_loop_vec_info*, gimple*)
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vect-loop.cc:12114
0x1138c7f vect_transform_loops
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vectorizer.cc:1007
0x1139307 try_vectorize_loop_1
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vectorizer.cc:1153
0x1139307 try_vectorize_loop
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vectorizer.cc:1183
0x113967b execute
        /var/jenkins/workspace/GCC_Nightly/gcc/tree-vectorizer.cc:1299
Please submit a full bug report, with preprocessed source (by using
-freport-bug).

Please let me know if you need a reduced testcase.

Thanks,
Kugan