From: Weiwei Li Date: Fri, 25 Mar 2022 08:59:01 +0000 (+0800) Subject: target/riscv: optimize condition assign for scale < 0 X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c341e886d9d63a1a27e1b523991e36e2d8cefab7;p=qemu.git target/riscv: optimize condition assign for scale < 0 for some cases, scale is always equal or less than 0, since lmul is not larger than 3 Signed-off-by: Weiwei Li Signed-off-by: Junqiang Wang Reviewed-by: Frank Chang Acked-by: Alistair Francis Message-Id: <20220325085902.29500-1-liweiwei@iscas.ac.cn> Signed-off-by: Alistair Francis --- diff --git a/target/riscv/insn_trans/trans_rvv.c.inc b/target/riscv/insn_trans/trans_rvv.c.inc index 8d675db9a2..b336d57270 100644 --- a/target/riscv/insn_trans/trans_rvv.c.inc +++ b/target/riscv/insn_trans/trans_rvv.c.inc @@ -1198,7 +1198,7 @@ GEN_LDST_WHOLE_TRANS(vs8r_v, 8, true) static inline uint32_t MAXSZ(DisasContext *s) { int scale = s->lmul - 3; - return scale < 0 ? s->cfg_ptr->vlen >> -scale : s->cfg_ptr->vlen << scale; + return s->cfg_ptr->vlen >> -scale; } static bool opivv_check(DisasContext *s, arg_rmrr *a) @@ -3597,8 +3597,7 @@ static bool trans_vrgather_vx(DisasContext *s, arg_rmrr *a) if (a->vm && s->vl_eq_vlmax) { int scale = s->lmul - (s->sew + 3); - int vlmax = scale < 0 ? - s->cfg_ptr->vlen >> -scale : s->cfg_ptr->vlen << scale; + int vlmax = s->cfg_ptr->vlen >> -scale; TCGv_i64 dest = tcg_temp_new_i64(); if (a->rs1 == 0) { @@ -3630,8 +3629,7 @@ static bool trans_vrgather_vi(DisasContext *s, arg_rmrr *a) if (a->vm && s->vl_eq_vlmax) { int scale = s->lmul - (s->sew + 3); - int vlmax = scale < 0 ? - s->cfg_ptr->vlen >> -scale : s->cfg_ptr->vlen << scale; + int vlmax = s->cfg_ptr->vlen >> -scale; if (a->rs1 >= vlmax) { tcg_gen_gvec_dup_imm(MO_64, vreg_ofs(s, a->rd), MAXSZ(s), MAXSZ(s), 0);