https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112431
--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Lehua Ding <lh...@gcc.gnu.org>: https://gcc.gnu.org/g:4418d55bcd1b7e0ef823981b6a781d7de5c38cce commit r14-6054-g4418d55bcd1b7e0ef823981b6a781d7de5c38cce Author: Juzhe-Zhong <juzhe.zh...@rivai.ai> Date: Fri Dec 1 16:09:59 2023 +0800 RISC-V: Support highpart overlap for indexed load with SRC EEW < DEST EEW Leverage previous approach. Before this patch: .L5: add a3,s0,s2 add a4,s6,s2 add a5,s7,s2 vsetvli zero,s0,e64,m8,ta,ma vle8.v v4,0(s2) vle8.v v3,0(a3) mv s2,s1 vle8.v v2,0(a4) vle8.v v1,0(a5) nop vluxei8.v v8,(s1),v4 vs8r.v v8,0(sp) ---> spill vluxei8.v v8,(s1),v3 vluxei8.v v16,(s1),v2 vluxei8.v v24,(s1),v1 nop vmv.x.s a1,v8 vl8re64.v v8,0(sp) ---> reload vmv.x.s a3,v24 vmv.x.s a2,v16 vmv.x.s a0,v8 add s1,s1,s5 call sumation add s3,s3,a0 bgeu s4,s1,.L5 After this patch: .L5: add a3,s0,s2 add a4,s6,s2 add a5,s7,s2 vsetvli zero,s0,e64,m8,ta,ma vle8.v v15,0(s2) vle8.v v23,0(a3) mv s2,s1 vle8.v v31,0(a4) vle8.v v7,0(a5) vluxei8.v v8,(s1),v15 vluxei8.v v16,(s1),v23 vluxei8.v v24,(s1),v31 vluxei8.v v0,(s1),v7 vmv.x.s a3,v0 vmv.x.s a2,v24 vmv.x.s a1,v16 vmv.x.s a0,v8 add s1,s1,s5 call sumation add s3,s3,a0 bgeu s4,s1,.L5 PR target/112431 gcc/ChangeLog: * config/riscv/vector.md: Support highpart overlap for indexed load. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/pr112431-28.c: New test. * gcc.target/riscv/rvv/base/pr112431-29.c: New test. * gcc.target/riscv/rvv/base/pr112431-30.c: New test. * gcc.target/riscv/rvv/base/pr112431-31.c: New test. * gcc.target/riscv/rvv/base/pr112431-32.c: New test. * gcc.target/riscv/rvv/base/pr112431-33.c: New test.
