From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48107) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TB2bS-00060P-09 for qemu-devel@nongnu.org; Mon, 10 Sep 2012 07:56:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TB2bQ-0006eF-P8 for qemu-devel@nongnu.org; Mon, 10 Sep 2012 07:56:33 -0400 Received: from hall.aurel32.net ([88.191.126.93]:42331) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TB2bQ-0006du-GG for qemu-devel@nongnu.org; Mon, 10 Sep 2012 07:56:32 -0400 From: Aurelien Jarno Date: Mon, 10 Sep 2012 13:56:24 +0200 Message-Id: <1347278184-18693-1-git-send-email-aurelien@aurel32.net> Subject: [Qemu-devel] [PATCH] tcg/i386: allow constants in load/store ops List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Aurelien Jarno On x86, it is possible to move a constant value to memory. Add code to handle a constant argument to load/store ops. Signed-off-by: Aurelien Jarno --- tcg/i386/tcg-target.c | 50 ++++++++++++++++++++++++++++++++++++------------- 1 file changed, 37 insertions(+), 13 deletions(-) diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index da17bba..c9e9b3a 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -265,6 +265,7 @@ static inline int tcg_target_const_match(tcg_target_long val, #define OPC_MOVB_EvGv (0x88) /* stores, more or less */ #define OPC_MOVL_EvGv (0x89) /* stores, more or less */ #define OPC_MOVL_GvEv (0x8b) /* loads, more or less */ +#define OPC_MOVB_EvIz (0xc6) #define OPC_MOVL_EvIz (0xc7) #define OPC_MOVL_Iv (0xb8) #define OPC_MOVSBL (0xbe | P_EXT) @@ -1573,18 +1574,35 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, break; OP_32_64(st8): - tcg_out_modrm_offset(s, OPC_MOVB_EvGv | P_REXB_R, - args[0], args[1], args[2]); + if (const_args[0]) { + tcg_out_modrm_offset(s, OPC_MOVB_EvIz, + 0, args[1], args[2]); + tcg_out8(s, args[0]); + } else { + tcg_out_modrm_offset(s, OPC_MOVB_EvGv | P_REXB_R, + args[0], args[1], args[2]); + } break; OP_32_64(st16): - tcg_out_modrm_offset(s, OPC_MOVL_EvGv | P_DATA16, - args[0], args[1], args[2]); + if (const_args[0]) { + tcg_out_modrm_offset(s, OPC_MOVL_EvIz | P_DATA16, + 0, args[1], args[2]); + tcg_out16(s, args[0]); + } else { + tcg_out_modrm_offset(s, OPC_MOVL_EvGv | P_DATA16, + args[0], args[1], args[2]); + } break; #if TCG_TARGET_REG_BITS == 64 case INDEX_op_st32_i64: #endif case INDEX_op_st_i32: - tcg_out_st(s, TCG_TYPE_I32, args[0], args[1], args[2]); + if (const_args[0]) { + tcg_out_modrm_offset(s, OPC_MOVL_EvIz, 0, args[1], args[2]); + tcg_out32(s, args[0]); + } else { + tcg_out_st(s, TCG_TYPE_I32, args[0], args[1], args[2]); + } break; OP_32_64(add): @@ -1788,7 +1806,13 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, tcg_out_ld(s, TCG_TYPE_I64, args[0], args[1], args[2]); break; case INDEX_op_st_i64: - tcg_out_st(s, TCG_TYPE_I64, args[0], args[1], args[2]); + if (const_args[0]) { + tcg_out_modrm_offset(s, OPC_MOVL_EvIz | P_REXW, + 0, args[1], args[2]); + tcg_out32(s, args[0]); + } else { + tcg_out_st(s, TCG_TYPE_I64, args[0], args[1], args[2]); + } break; case INDEX_op_qemu_ld32s: tcg_out_qemu_ld(s, args, 2 | 4); @@ -1850,9 +1874,9 @@ static const TCGTargetOpDef x86_op_defs[] = { { INDEX_op_ld16u_i32, { "r", "r" } }, { INDEX_op_ld16s_i32, { "r", "r" } }, { INDEX_op_ld_i32, { "r", "r" } }, - { INDEX_op_st8_i32, { "q", "r" } }, - { INDEX_op_st16_i32, { "r", "r" } }, - { INDEX_op_st_i32, { "r", "r" } }, + { INDEX_op_st8_i32, { "qi", "r" } }, + { INDEX_op_st16_i32, { "ri", "r" } }, + { INDEX_op_st_i32, { "ri", "r" } }, { INDEX_op_add_i32, { "r", "r", "ri" } }, { INDEX_op_sub_i32, { "r", "0", "ri" } }, @@ -1903,10 +1927,10 @@ static const TCGTargetOpDef x86_op_defs[] = { { INDEX_op_ld32u_i64, { "r", "r" } }, { INDEX_op_ld32s_i64, { "r", "r" } }, { INDEX_op_ld_i64, { "r", "r" } }, - { INDEX_op_st8_i64, { "r", "r" } }, - { INDEX_op_st16_i64, { "r", "r" } }, - { INDEX_op_st32_i64, { "r", "r" } }, - { INDEX_op_st_i64, { "r", "r" } }, + { INDEX_op_st8_i64, { "ri", "r" } }, + { INDEX_op_st16_i64, { "ri", "r" } }, + { INDEX_op_st32_i64, { "ri", "r" } }, + { INDEX_op_st_i64, { "re", "r" } }, { INDEX_op_add_i64, { "r", "0", "re" } }, { INDEX_op_mul_i64, { "r", "0", "re" } }, -- 1.7.10.4