From e390872aebcfebb7c9bc95d8fb7e44f2bec996d3 Mon Sep 17 00:00:00 2001 From: Juzhe-Zhong Date: Sun, 10 Sep 2023 22:07:10 +0800 Subject: [PATCH] RISC-V: Avoid unnecessary slideup in compress pattern of vec_perm gcc/ChangeLog: * config/riscv/riscv-v.cc (shuffle_compress_patterns): Avoid unnecessary slideup. --- gcc/config/riscv/riscv-v.cc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc index 1ca3f1dc8df5..8a548f5d1a27 100644 --- a/gcc/config/riscv/riscv-v.cc +++ b/gcc/config/riscv/riscv-v.cc @@ -2647,7 +2647,8 @@ shuffle_compress_patterns (struct expand_vec_perm_d *d) For index = { 0, 2, 5, 6}, we need to slide op1 up before we apply compress approach. */ - bool need_slideup_p = maybe_ne (d->perm[vlen - 1], 2 * vec_len - 1); + bool need_slideup_p = maybe_ne (d->perm[vlen - 1], 2 * vec_len - 1) + && !const_vec_duplicate_p (d->op1); /* If we leave it directly be handled by general gather, the code sequence will be: -- 2.47.2