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| author | Richard Henderson <richard.henderson@linaro.org> | 2020-05-19 14:24:52 -0700 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-05-21 22:05:27 +0100 |
| commit | 5c27392dd08bd8534893abf25ef501f1bd8680fe (patch) | |
| tree | 19d6534b7040ebcf89e7146e51cb11c8521a6131 | |
| parent | faf58e53695be8eedc47b6232d581d37461d0f6e (diff) | |
| download | qemu-5c27392dd08bd8534893abf25ef501f1bd8680fe.zip qemu-5c27392dd08bd8534893abf25ef501f1bd8680fe.tar.gz qemu-5c27392dd08bd8534893abf25ef501f1bd8680fe.tar.bz2 | |
target/arm: Use tcg_gen_gvec_mov for clear_vec_high
The 8-byte store for the end a !is_q operation can be
merged with the other stores. Use a no-op vector move
to trigger the expand_clr portion of tcg_gen_gvec_mov.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200519212453.28494-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | target/arm/translate-a64.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index 991e451..4f6edb2 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -496,14 +496,8 @@ static void clear_vec_high(DisasContext *s, bool is_q, int rd) unsigned ofs = fp_reg_offset(s, rd, MO_64); unsigned vsz = vec_full_reg_size(s); - if (!is_q) { - TCGv_i64 tcg_zero = tcg_const_i64(0); - tcg_gen_st_i64(tcg_zero, cpu_env, ofs + 8); - tcg_temp_free_i64(tcg_zero); - } - if (vsz > 16) { - tcg_gen_gvec_dup_imm(MO_64, ofs + 16, vsz - 16, vsz - 16, 0); - } + /* Nop move, with side effect of clearing the tail. */ + tcg_gen_gvec_mov(MO_64, ofs, ofs, is_q ? 16 : 8, vsz); } void write_fp_dreg(DisasContext *s, int reg, TCGv_i64 v) |