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tcg-i386: Tidy bswap operations. 

Define OPC_BSWAP.  Factor opcode emission to separate functions.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-04-28 10:31:18 -07:00 committed by Aurelien Jarno
parent 702a8a99c3
commit fcb5dac1f7
1 changed files with 27 additions and 26 deletions
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53
tcg/i386/tcg-target.c
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@ -156,6 +156,10 @@ static inline int tcg_target_const_match(tcg_target_long val,
return 0;
}
#define P_EXT 0x100 /* 0x0f opcode prefix */
#define OPC_BSWAP (0xc8 | P_EXT)
#define ARITH_ADD 0
#define ARITH_OR 1
#define ARITH_ADC 2
@ -283,6 +287,18 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, int arg,
tcg_out_modrm_offset(s, 0x89, arg, arg1, arg2);
}
static inline void tcg_out_bswap32(TCGContext *s, int reg)
{
tcg_out_opc(s, OPC_BSWAP + 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);
}
static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val, int cf)
{
if (!cf && ((c == ARITH_ADD && val == 1) || (c == ARITH_SUB && val == -1))) {
@ -695,20 +711,14 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
/* movzwl */
tcg_out_modrm_offset(s, 0xb7 | P_EXT, data_reg, r0, GUEST_BASE);
if (bswap) {
/* rolw $8, data_reg */
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, 0, data_reg);
tcg_out8(s, 8);
tcg_out_rolw_8(s, data_reg);
}
break;
case 1 | 4:
/* movswl */
tcg_out_modrm_offset(s, 0xbf | P_EXT, data_reg, r0, GUEST_BASE);
if (bswap) {
/* rolw $8, data_reg */
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, 0, data_reg);
tcg_out8(s, 8);
tcg_out_rolw_8(s, data_reg);
/* movswl data_reg, data_reg */
tcg_out_modrm(s, 0xbf | P_EXT, data_reg, data_reg);
@ -718,8 +728,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
/* movl (r0), data_reg */
tcg_out_modrm_offset(s, 0x8b, data_reg, r0, GUEST_BASE);
if (bswap) {
/* bswap */
tcg_out_opc(s, (0xc8 + data_reg) | P_EXT);
tcg_out_bswap32(s, data_reg);
}
break;
case 3:
@ -736,11 +745,10 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_modrm_offset(s, 0x8b, data_reg2, r0, GUEST_BASE + 4);
} else {
tcg_out_modrm_offset(s, 0x8b, data_reg, r0, GUEST_BASE + 4);
tcg_out_opc(s, (0xc8 + data_reg) | P_EXT);
tcg_out_bswap32(s, data_reg);
tcg_out_modrm_offset(s, 0x8b, data_reg2, r0, GUEST_BASE);
/* bswap */
tcg_out_opc(s, (0xc8 + data_reg2) | P_EXT);
tcg_out_bswap32(s, data_reg2);
}
break;
default:
@ -924,9 +932,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
case 1:
if (bswap) {
tcg_out_mov(s, r1, data_reg);
tcg_out8(s, 0x66); /* rolw $8, %ecx */
tcg_out_modrm(s, 0xc1, 0, r1);
tcg_out8(s, 8);
tcg_out_rolw_8(s, r1);
data_reg = r1;
}
/* movw */
@ -936,8 +942,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
case 2:
if (bswap) {
tcg_out_mov(s, r1, data_reg);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
tcg_out_bswap32(s, r1);
data_reg = r1;
}
/* movl */
@ -946,12 +951,10 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
case 3:
if (bswap) {
tcg_out_mov(s, r1, data_reg2);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
tcg_out_bswap32(s, r1);
tcg_out_modrm_offset(s, 0x89, r1, r0, GUEST_BASE);
tcg_out_mov(s, r1, data_reg);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
tcg_out_bswap32(s, r1);
tcg_out_modrm_offset(s, 0x89, r1, r0, GUEST_BASE + 4);
} else {
tcg_out_modrm_offset(s, 0x89, data_reg, r0, GUEST_BASE);
@ -1149,12 +1152,10 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_bswap16_i32:
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, SHIFT_ROL, args[0]);
tcg_out8(s, 8);
tcg_out_rolw_8(s, args[0]);
break;
case INDEX_op_bswap32_i32:
tcg_out_opc(s, (0xc8 + args[0]) | P_EXT);
tcg_out_bswap32(s, args[0]);
break;
case INDEX_op_neg_i32: