Re: [Qemu-devel] [PATCH v4 05/11] target/arm: Introduce and use read_fp_hreg

["Alex Bennée" <alex.bennee@linaro.org>]

Richard Henderson <richard.henderson@linaro.org> writes:

> Cc: qemu-stable@nongnu.org
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  target/arm/translate-a64.c | 30 ++++++++++++++----------------
>  1 file changed, 14 insertions(+), 16 deletions(-)
>
> diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
> index d0ed125442..78f12daaf6 100644
> --- a/target/arm/translate-a64.c
> +++ b/target/arm/translate-a64.c
> @@ -615,6 +615,14 @@ static TCGv_i32 read_fp_sreg(DisasContext *s, int reg)
>      return v;
>  }
>
> +static TCGv_i32 read_fp_hreg(DisasContext *s, int reg)
> +{
> +    TCGv_i32 v = tcg_temp_new_i32();
> +
> +    tcg_gen_ld16u_i32(v, cpu_env, fp_reg_offset(s, reg, MO_16));
> +    return v;
> +}
> +
>  /* Clear the bits above an N-bit vector, for N = (is_q ? 128 : 64).
>   * If SVE is not enabled, then there are only 128 bits in the vector.
>   */
> @@ -4881,11 +4889,9 @@ static void disas_fp_csel(DisasContext *s, uint32_t insn)
>  static void handle_fp_1src_half(DisasContext *s, int opcode, int rd, int rn)
>  {
>      TCGv_ptr fpst = NULL;
> -    TCGv_i32 tcg_op = tcg_temp_new_i32();
> +    TCGv_i32 tcg_op = read_fp_hreg(s, rn);
>      TCGv_i32 tcg_res = tcg_temp_new_i32();
>
> -    read_vec_element_i32(s, tcg_op, rn, 0, MO_16);
> -
>      switch (opcode) {
>      case 0x0: /* FMOV */
>          tcg_gen_mov_i32(tcg_res, tcg_op);
> @@ -7784,13 +7790,10 @@ static void disas_simd_scalar_three_reg_diff(DisasContext *s, uint32_t insn)
>          tcg_temp_free_i64(tcg_op2);
>          tcg_temp_free_i64(tcg_res);
>      } else {
> -        TCGv_i32 tcg_op1 = tcg_temp_new_i32();
> -        TCGv_i32 tcg_op2 = tcg_temp_new_i32();
> +        TCGv_i32 tcg_op1 = read_fp_hreg(s, rn);
> +        TCGv_i32 tcg_op2 = read_fp_hreg(s, rm);
>          TCGv_i64 tcg_res = tcg_temp_new_i64();
>
> -        read_vec_element_i32(s, tcg_op1, rn, 0, MO_16);
> -        read_vec_element_i32(s, tcg_op2, rm, 0, MO_16);
> -
>          gen_helper_neon_mull_s16(tcg_res, tcg_op1, tcg_op2);
>          gen_helper_neon_addl_saturate_s32(tcg_res, cpu_env, tcg_res, tcg_res);
>
> @@ -8331,13 +8334,10 @@ static void disas_simd_scalar_three_reg_same_fp16(DisasContext *s,
>
>      fpst = get_fpstatus_ptr(true);
>
> -    tcg_op1 = tcg_temp_new_i32();
> -    tcg_op2 = tcg_temp_new_i32();
> +    tcg_op1 = read_fp_hreg(s, rn);
> +    tcg_op2 = read_fp_hreg(s, rm);
>      tcg_res = tcg_temp_new_i32();
>
> -    read_vec_element_i32(s, tcg_op1, rn, 0, MO_16);
> -    read_vec_element_i32(s, tcg_op2, rm, 0, MO_16);
> -
>      switch (fpopcode) {
>      case 0x03: /* FMULX */
>          gen_helper_advsimd_mulxh(tcg_res, tcg_op1, tcg_op2, fpst);
> @@ -12235,11 +12235,9 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
>      }
>
>      if (is_scalar) {
> -        TCGv_i32 tcg_op = tcg_temp_new_i32();
> +        TCGv_i32 tcg_op = read_fp_hreg(s, rn);
>          TCGv_i32 tcg_res = tcg_temp_new_i32();
>
> -        read_vec_element_i32(s, tcg_op, rn, 0, MO_16);
> -
>          switch (fpop) {
>          case 0x1a: /* FCVTNS */
>          case 0x1b: /* FCVTMS */


--
Alex Bennée