Re: [Qemu-devel] [PATCH 10/22] tcg-i386: Tidy immediate arithmetic operations.

[Aurelien Jarno <aurelien@aurel32.net>]

On Wed, Apr 14, 2010 at 08:38:34AM -0700, Richard Henderson wrote:
> Define OPC_ARITH_EvI[bz]; use throughout.  Use tcg_out_ext8u
> directly in setcond.  Use tgen_arithi in qemu_ld/st.
> 
> Signed-off-by: Richard Henderson <rth@twiddle.net>

Acked-by: Aurelien Jarno <aurelien@aurel32.net>

> ---
>  tcg/i386/tcg-target.c |   28 +++++++++++-----------------
>  1 files changed, 11 insertions(+), 17 deletions(-)
> 
> diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
> index aac2c5a..df1bdfc 100644
> --- a/tcg/i386/tcg-target.c
> +++ b/tcg/i386/tcg-target.c
> @@ -163,6 +163,8 @@ static inline int tcg_target_const_match(tcg_target_long val,
>  
>  #define P_EXT   0x100 /* 0x0f opcode prefix */
>  
> +#define OPC_ARITH_EvIz	(0x81)
> +#define OPC_ARITH_EvIb	(0x83)
>  #define OPC_BSWAP	(0xc8 | P_EXT)
>  #define OPC_JCC_long	(0x80 | P_EXT)	/* ... plus condition code */
>  #define OPC_JCC_short	(0x70)		/* ... plus condition code */
> @@ -324,7 +326,7 @@ static void tcg_out_ext8u(TCGContext *s, int dest, int src)
>      if (src >= 4) {
>          tcg_out_mov(s, dest, src);
>          if (dest >= 4) {
> -            tcg_out_modrm(s, 0x81, ARITH_AND, dest);
> +            tcg_out_modrm(s, OPC_ARITH_EvIz, ARITH_AND, dest);
>              tcg_out32(s, 0xff);
>              return;
>          }
> @@ -381,14 +383,14 @@ static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val, int cf
>          /* dec */
>          tcg_out_opc(s, 0x48 + r0);
>      } else if (val == (int8_t)val) {
> -        tcg_out_modrm(s, 0x83, c, r0);
> +        tcg_out_modrm(s, OPC_ARITH_EvIb, c, r0);
>          tcg_out8(s, val);
>      } else if (c == ARITH_AND && val == 0xffu && r0 < 4) {
>          tcg_out_ext8u(s, r0, r0);
>      } else if (c == ARITH_AND && val == 0xffffu) {
>          tcg_out_ext16u(s, r0, r0);
>      } else {
> -        tcg_out_modrm(s, 0x81, c, r0);
> +        tcg_out_modrm(s, OPC_ARITH_EvIz, c, r0);
>          tcg_out32(s, val);
>      }
>  }
> @@ -557,7 +559,7 @@ static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGArg dest,
>      tcg_out_cmp(s, arg1, arg2, const_arg2);
>      /* setcc */
>      tcg_out_modrm(s, 0x90 | tcg_cond_to_jcc[cond] | P_EXT, 0, dest);
> -    tgen_arithi(s, ARITH_AND, dest, 0xff, 0);
> +    tcg_out_ext8u(s, dest, dest);
>  }
>  
>  static void tcg_out_setcond2(TCGContext *s, const TCGArg *args,
> @@ -659,16 +661,12 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
>  
>  #if defined(CONFIG_SOFTMMU)
>      tcg_out_mov(s, r1, addr_reg); 
> -
>      tcg_out_mov(s, r0, addr_reg); 
> - 
> +
>      tcg_out_shifti(s, SHIFT_SHR, r1, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS); 
>  
> -    tcg_out_modrm(s, 0x81, 4, r0); /* andl $x, r0 */
> -    tcg_out32(s, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
> -    
> -    tcg_out_modrm(s, 0x81, 4, r1); /* andl $x, r1 */
> -    tcg_out32(s, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
> +    tgen_arithi(s, ARITH_AND, r0, TARGET_PAGE_MASK | ((1 << s_bits) - 1), 0);
> +    tgen_arithi(s, ARITH_AND, r1, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS, 0);
>  
>      tcg_out_opc(s, 0x8d); /* lea offset(r1, %ebp), r1 */
>      tcg_out8(s, 0x80 | (r1 << 3) | 0x04);
> @@ -853,16 +851,12 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
>  
>  #if defined(CONFIG_SOFTMMU)
>      tcg_out_mov(s, r1, addr_reg); 
> -
>      tcg_out_mov(s, r0, addr_reg); 
>   
>      tcg_out_shifti(s, SHIFT_SHR, r1, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS); 
>  
> -    tcg_out_modrm(s, 0x81, 4, r0); /* andl $x, r0 */
> -    tcg_out32(s, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
> -    
> -    tcg_out_modrm(s, 0x81, 4, r1); /* andl $x, r1 */
> -    tcg_out32(s, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
> +    tgen_arithi(s, ARITH_AND, r0, TARGET_PAGE_MASK | ((1 << s_bits) - 1), 0);
> +    tgen_arithi(s, ARITH_AND, r1, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS, 0);
>  
>      tcg_out_opc(s, 0x8d); /* lea offset(r1, %ebp), r1 */
>      tcg_out8(s, 0x80 | (r1 << 3) | 0x04);
> -- 
> 1.6.6.1
> 
> 
> 
> 

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net