https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119477
Bug ID: 119477
Summary: RISC-V: -fno-tree-vectorize -fno-tree-loop-vectorize
-fno-tree-slp-vectorize can't turn off
auto-vectorization
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sundongya at nucleisys dot com
Target Milestone: ---
Hi,
Recently, when testing spec2006 intspeed case, I found that when I don't want
to enable auto-vectorization for some cases, the option `-fno-tree-vectorize
-fno-tree-loop-vectorize -fno-tree-slp-vectorize` cannot completely turn off
the auto-vectorization, and V instructions will still be generated.
gcc version
gcc version 15.0.1 20250312 (experimental) (g7efe3aa9b5d)
Compile options
CC = riscv64-unknown-linux-gnu-gcc -march=rv64imafdcv_zba_zbb_zbc_zbs
-mabi=lp64d -static
CXX = riscv64-unknown-linux-gnu-g++ -march=rv64imafdcv_zba_zbb_zbc_zbs
-mabi=lp64d -static
FC = riscv64-unknown-linux-gnu-gfortran -march=rv64imafdcv_zba_zbb_zbc_zbs
-mabi=lp64d -static
#####################################################################
# Optimization
#####################################################################
default=base=default=default:
COPTIMIZE = -Ofast -flto -fno-tree-vectorize -fno-tree-loop-vectorize
-fno-tree-slp-vectorize -fno-tree-loop-if-convert
CXXOPTIMIZE = -Ofast -flto -fno-tree-vectorize -fno-tree-loop-vectorize
-fno-tree-slp-vectorize -fno-tree-loop-if-convert
FOPTIMIZE = -Ofast -flto -fno-tree-vectorize -fno-tree-loop-vectorize
-fno-tree-slp-vectorize -fno-tree-loop-if-convert
