https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112431
--- Comment #15 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Pan Li <pa...@gcc.gnu.org>: https://gcc.gnu.org/g:7e854b58084c131fceca9e8fa9dcc7469972e69d commit r14-6400-g7e854b58084c131fceca9e8fa9dcc7469972e69d Author: Juzhe-Zhong <juzhe.zh...@rivai.ai> Date: Sat Dec 9 12:06:29 2023 +0800 RISC-V: Support highest overlap for wv instructions According to RVV ISA, we can allow vwadd.wv v2, v2, v3 overlap. Before this patch: nop vsetivli zero,4,e8,m4,tu,ma vle16.v v8,0(a0) vmv8r.v v0,v8 vwsub.wv v0,v8,v12 nop addi a4,a0,100 vle16.v v8,0(a4) vmv8r.v v24,v8 vwsub.wv v24,v8,v12 nop addi a4,a0,200 vle16.v v8,0(a4) vmv8r.v v16,v8 vwsub.wv v16,v8,v12 nop After this patch: nop vsetivli zero,4,e8,m4,tu,ma vle16.v v0,0(a0) vwsub.wv v0,v0,v4 nop addi a4,a0,100 vle16.v v24,0(a4) vwsub.wv v24,v24,v28 nop addi a4,a0,200 vle16.v v16,0(a4) vwsub.wv v16,v16,v20 PR target/112431 gcc/ChangeLog: * config/riscv/vector.md: Support highest overlap for wv instructions. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/pr112431-39.c: New test. * gcc.target/riscv/rvv/base/pr112431-40.c: New test. * gcc.target/riscv/rvv/base/pr112431-41.c: New test.
