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[Bug tree-optimization/85891] [6 Regression] Simple loop is not SLP-vectorized after r196872
- From: "jason.vas.dias at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 24 May 2018 10:08:00 +0000
- Subject: [Bug tree-optimization/85891] [6 Regression] Simple loop is not SLP-vectorized after r196872
- Auto-submitted: auto-generated
- References: <bug-85891-4@http.gcc.gnu.org/bugzilla/>
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