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Re: [Qemu-devel] [PATCH v2 16/27] tcg-ppc64: Implement bswap16 and bswap
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH v2 16/27] tcg-ppc64: Implement bswap16 and bswap32 |
Date: |
Mon, 1 Apr 2013 16:57:50 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Mar 04, 2013 at 04:32:59PM -0800, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <address@hidden>
> ---
> tcg/ppc64/tcg-target.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> tcg/ppc64/tcg-target.h | 18 ++++++++++--------
> 2 files changed, 53 insertions(+), 8 deletions(-)
>
> diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
> index a08ad90..723cc77 100644
> --- a/tcg/ppc64/tcg-target.c
> +++ b/tcg/ppc64/tcg-target.c
> @@ -1668,6 +1668,44 @@ static void tcg_out_op (TCGContext *s, TCGOpcode opc,
> const TCGArg *args,
> const_args[2]);
> break;
>
> + case INDEX_op_bswap16_i32:
> + case INDEX_op_bswap16_i64:
> + a0 = args[0], a1 = args[1];
> + /* a1 = abcd */
> + if (a0 != a1) {
> + /* a0 = (a1 r<< 24) & 0xff # 000c */
> + tcg_out_rlw(s, RLWINM, a0, a1, 24, 24, 31);
> + /* a0 = (a0 & ~0xff00) | (a1 r<< 8) & 0xff00 # 00dc */
> + tcg_out_rlw(s, RLWIMI, a0, a1, 8, 16, 23);
> + } else {
> + /* r0 = (a1 r<< 8) & 0xff00 # 00d0 */
> + tcg_out_rlw(s, RLWINM, 0, a1, 8, 16, 23);
> + /* a0 = (a1 r<< 24) & 0xff # 000c */
> + tcg_out_rlw(s, RLWINM, a0, a1, 24, 24, 31);
> + /* a0 = a0 | r0 # 00dc */
> + tcg_out32(s, OR | SAB(0, a0, a0));
> + }
> + break;
> +
> + case INDEX_op_bswap32_i32:
> + case INDEX_op_bswap32_i64:
> + /* Stolen from gcc's builtin_bswap32 */
> + a1 = args[1];
> + a0 = args[0] == a1 ? 0 : args[0];
> +
> + /* a1 = args[1] # abcd */
> + /* a0 = rotate_left (a1, 8) # bcda */
> + tcg_out_rlw(s, RLWINM, a0, a1, 8, 0, 31);
> + /* a0 = (a0 & ~0xff000000) | ((a1 r<< 24) & 0xff000000) # dcda */
> + tcg_out_rlw(s, RLWIMI, a0, a1, 24, 0, 7);
> + /* a0 = (a0 & ~0x0000ff00) | ((a1 r<< 24) & 0x0000ff00) # dcba */
> + tcg_out_rlw(s, RLWIMI, a0, a1, 24, 16, 23);
> +
> + if (!a0) {
> + tcg_out_mov(s, TCG_TYPE_I64, args[0], a0);
> + }
> + break;
> +
It would be a lot easier to read if you had use TCG_REG_R0 instead of 0,
especially for the if.
> default:
> tcg_dump_ops (s);
> tcg_abort ();
> @@ -1774,6 +1812,11 @@ static const TCGTargetOpDef ppc_op_defs[] = {
> { INDEX_op_setcond_i32, { "r", "r", "ri" } },
> { INDEX_op_setcond_i64, { "r", "r", "ri" } },
>
> + { INDEX_op_bswap16_i32, { "r", "r" } },
> + { INDEX_op_bswap16_i64, { "r", "r" } },
> + { INDEX_op_bswap32_i32, { "r", "r" } },
> + { INDEX_op_bswap32_i64, { "r", "r" } },
> +
> { -1 },
> };
>
> diff --git a/tcg/ppc64/tcg-target.h b/tcg/ppc64/tcg-target.h
> index dbefe7d..bd011b8 100644
> --- a/tcg/ppc64/tcg-target.h
> +++ b/tcg/ppc64/tcg-target.h
> @@ -67,15 +67,19 @@ typedef enum {
> #define TCG_TARGET_STACK_ALIGN 16
> #define TCG_TARGET_CALL_STACK_OFFSET 48
>
> +/* optional instructions automatically implemented */
> +#define TCG_TARGET_HAS_ext8u_i32 0 /* andi */
> +#define TCG_TARGET_HAS_ext16u_i32 0
> +#define TCG_TARGET_HAS_ext8u_i64 0
> +#define TCG_TARGET_HAS_ext16u_i64 0
> +
That should go in the and patches instead. Otherwise looks fine.
> /* optional instructions */
> #define TCG_TARGET_HAS_div_i32 1
> #define TCG_TARGET_HAS_rot_i32 1
> #define TCG_TARGET_HAS_ext8s_i32 1
> #define TCG_TARGET_HAS_ext16s_i32 1
> -#define TCG_TARGET_HAS_ext8u_i32 0
> -#define TCG_TARGET_HAS_ext16u_i32 0
> -#define TCG_TARGET_HAS_bswap16_i32 0
> -#define TCG_TARGET_HAS_bswap32_i32 0
> +#define TCG_TARGET_HAS_bswap16_i32 1
> +#define TCG_TARGET_HAS_bswap32_i32 1
> #define TCG_TARGET_HAS_not_i32 1
> #define TCG_TARGET_HAS_neg_i32 1
> #define TCG_TARGET_HAS_andc_i32 0
> @@ -95,11 +99,9 @@ typedef enum {
> #define TCG_TARGET_HAS_ext8s_i64 1
> #define TCG_TARGET_HAS_ext16s_i64 1
> #define TCG_TARGET_HAS_ext32s_i64 1
> -#define TCG_TARGET_HAS_ext8u_i64 0
> -#define TCG_TARGET_HAS_ext16u_i64 0
> #define TCG_TARGET_HAS_ext32u_i64 1
> -#define TCG_TARGET_HAS_bswap16_i64 0
> -#define TCG_TARGET_HAS_bswap32_i64 0
> +#define TCG_TARGET_HAS_bswap16_i64 1
> +#define TCG_TARGET_HAS_bswap32_i64 1
> #define TCG_TARGET_HAS_bswap64_i64 0
> #define TCG_TARGET_HAS_not_i64 1
> #define TCG_TARGET_HAS_neg_i64 1
> --
> 1.8.1.2
>
>
>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
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