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tcg-i386: Tidy calls. 

Define OPC_CALL_Jz, generated by tcg_out_calli; use the later
throughout.  Unify the calls within qemu_st; adjust the stack
with a single pop if applicable.

Define and use EXT_CALLN_Ev for indirect calls.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-05-21 08:30:27 -07:00 committed by Aurelien Jarno
parent 6858614e6c
commit aadb21a4b2
1 changed files with 27 additions and 22 deletions
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49
tcg/i386/tcg-target.c
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@ -163,6 +163,7 @@ static inline int tcg_target_const_match(tcg_target_long val,
#define OPC_ARITH_GvEv (0x03) /* ... plus (ARITH_FOO << 3) */
#define OPC_ADD_GvEv (OPC_ARITH_GvEv | (ARITH_ADD << 3))
#define OPC_BSWAP (0xc8 | P_EXT)
#define OPC_CALL_Jz (0xe8)
#define OPC_CMP_GvEv (OPC_ARITH_GvEv | (ARITH_CMP << 3))
#define OPC_DEC_r32 (0x48)
#define OPC_INC_r32 (0x40)
@ -205,6 +206,7 @@ static inline int tcg_target_const_match(tcg_target_long val,
#define SHIFT_SAR 7
/* Group 5 opcode extensions for 0xff. */
#define EXT_CALLN_Ev 2
#define EXT_JMPN_Ev 4
/* Condition codes to be added to OPC_JCC_{long,short}. */
@ -621,6 +623,12 @@ static void tcg_out_setcond2(TCGContext *s, const TCGArg *args,
}
}
static void tcg_out_calli(TCGContext *s, tcg_target_long dest)
{
tcg_out_opc(s, OPC_CALL_Jz);
tcg_out32(s, dest - (tcg_target_long)s->code_ptr - 4);
}
#if defined(CONFIG_SOFTMMU)
#include "../../softmmu_defs.h"
@ -725,9 +733,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_mov(s, TCG_REG_EDX, addr_reg2);
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_ECX, mem_index);
#endif
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_ld_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_calli(s, (tcg_target_long)qemu_ld_helpers[s_bits]);
switch(opc) {
case 0 | 4:
@ -844,6 +850,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
{
int addr_reg, data_reg, data_reg2, r0, r1, mem_index, s_bits, bswap;
#if defined(CONFIG_SOFTMMU)
int stack_adjust;
uint8_t *label1_ptr, *label2_ptr;
#endif
#if TARGET_LONG_BITS == 64
@ -917,10 +924,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
tcg_out_mov(s, TCG_REG_EDX, data_reg);
tcg_out_mov(s, TCG_REG_ECX, data_reg2);
tcg_out_pushi(s, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 4);
stack_adjust = 4;
} else {
switch(opc) {
case 0:
@ -934,9 +938,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
break;
}
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_ECX, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
stack_adjust = 0;
}
#else
if (opc == 3) {
@ -944,10 +946,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
tcg_out_pushi(s, mem_index);
tcg_out_push(s, data_reg2);
tcg_out_push(s, data_reg);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 12);
stack_adjust = 12;
} else {
tcg_out_mov(s, TCG_REG_EDX, addr_reg2);
switch(opc) {
@ -962,13 +961,19 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
break;
}
tcg_out_pushi(s, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 4);
stack_adjust = 4;
}
#endif
tcg_out_calli(s, (tcg_target_long)qemu_st_helpers[s_bits]);
if (stack_adjust == 4) {
/* Pop and discard. This is 2 bytes smaller than the add. */
tcg_out_pop(s, TCG_REG_ECX);
} else if (stack_adjust != 0) {
tcg_out_addi(s, TCG_REG_ESP, stack_adjust);
}
/* jmp label2 */
tcg_out8(s, OPC_JMP_short);
label2_ptr = s->code_ptr;
@ -1061,10 +1066,10 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_call:
if (const_args[0]) {
tcg_out8(s, 0xe8);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
tcg_out_calli(s, args[0]);
} else {
tcg_out_modrm(s, 0xff, 2, args[0]);
/* call *reg */
tcg_out_modrm(s, 0xff, EXT_CALLN_Ev, args[0]);
}
break;
case INDEX_op_jmp: