diff options
| author | Richard Henderson <rth@twiddle.net> | 2010-04-28 10:38:04 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-05-20 21:09:08 +0200 |
| commit | f53dba010162a5ae57776084013e2d3ae32b0889 (patch) | |
| tree | f4924eb5f0f3b43e8c119c9f13f844e4042e9458 /tcg | |
| parent | fcb5dac1f79d48788d61a25630b713e1c31061cd (diff) | |
| download | qemu-f53dba010162a5ae57776084013e2d3ae32b0889.zip qemu-f53dba010162a5ae57776084013e2d3ae32b0889.tar.gz qemu-f53dba010162a5ae57776084013e2d3ae32b0889.tar.bz2 | |
tcg-i386: Tidy shift operations.
Define OPC_SHIFT_{1,Ib,cl}. Factor opcode emission to a function.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/i386/tcg-target.c | 35 |
1 files changed, 20 insertions, 15 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index 1ce42b9..8987f32 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -159,6 +159,9 @@ static inline int tcg_target_const_match(tcg_target_long val, #define P_EXT 0x100 /* 0x0f opcode prefix */ #define OPC_BSWAP (0xc8 | P_EXT) +#define OPC_SHIFT_1 (0xd1) +#define OPC_SHIFT_Ib (0xc1) +#define OPC_SHIFT_cl (0xd3) #define ARITH_ADD 0 #define ARITH_OR 1 @@ -287,6 +290,16 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, int arg, tcg_out_modrm_offset(s, 0x89, arg, arg1, arg2); } +static void tcg_out_shifti(TCGContext *s, int subopc, int reg, int count) +{ + if (count == 1) { + tcg_out_modrm(s, OPC_SHIFT_1, subopc, reg); + } else { + tcg_out_modrm(s, OPC_SHIFT_Ib, subopc, reg); + tcg_out8(s, count); + } +} + static inline void tcg_out_bswap32(TCGContext *s, int reg) { tcg_out_opc(s, OPC_BSWAP + reg); @@ -295,8 +308,7 @@ static inline void tcg_out_bswap32(TCGContext *s, int reg) static inline void tcg_out_rolw_8(TCGContext *s, int reg) { tcg_out8(s, 0x66); - tcg_out_modrm(s, 0xc1, 0, reg); - tcg_out8(s, 8); + tcg_out_shifti(s, SHIFT_ROL, reg, 8); } static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val, int cf) @@ -593,9 +605,8 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, tcg_out_mov(s, r0, addr_reg); - tcg_out_modrm(s, 0xc1, 5, r1); /* shr $x, r1 */ - tcg_out8(s, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS); - + 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)); @@ -797,9 +808,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, tcg_out_mov(s, r0, addr_reg); - tcg_out_modrm(s, 0xc1, 5, r1); /* shr $x, r1 */ - tcg_out8(s, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS); - + 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)); @@ -1100,14 +1110,9 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, c = SHIFT_SHL; gen_shift32: if (const_args[2]) { - if (args[2] == 1) { - tcg_out_modrm(s, 0xd1, c, args[0]); - } else { - tcg_out_modrm(s, 0xc1, c, args[0]); - tcg_out8(s, args[2]); - } + tcg_out_shifti(s, c, args[0], args[2]); } else { - tcg_out_modrm(s, 0xd3, c, args[0]); + tcg_out_modrm(s, OPC_SHIFT_cl, c, args[0]); } break; case INDEX_op_shr_i32: |