https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85891
--- Comment #4 from Jason Vas Dias <jason.vas.dias at gmail dot com> --- Same commands run by GCC 5.5.0 or GCC 7.3.1 succeed: $ g++5 slp-pr56812.cc -nostdinc++ -std=c++98 -O2 -ftree-vectorize -fno-vect-cost-model -msse2 -fdump-tree-slp-details=gcc5.out -O3 -funroll-loops -fvect-cost-model=dynamic -S -o slp-pr56812.gcc5.s $ grep 'basic block vectorized' gcc5.out slp-pr56812.cc:17:16: note: basic block vectorized $ gcc_7_3_env $ g++7 slp-pr56812.cc -nostdinc++ -std=c++14 -O2 -ftree-vectorize -fno-vect-cost-model -msse2 -fdump-tree-slp-details=gcc7.out -O3 -funroll-loops -fvect-cost-model=dynamic -S -o slp-pr56812.gcc7.s $ grep 'basic block vectorized' gcc7.out slp-pr56812.cc:18:1: note: basic block vectorized
