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BSR/BSF TCG conversion 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4477 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-17 18:44:58 +00:00
parent 7c6ce4baed
commit 6191b05901
4 changed files with 54 additions and 72 deletions
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31
target-i386/helper.c
View File

@ -5240,6 +5240,37 @@ void helper_movq(uint64_t *d, uint64_t *s)
#endif
/* bit operations */
target_ulong helper_bsf(target_ulong t0)
{
int count;
target_ulong res;
res = t0;
count = 0;
while ((res & 1) == 0) {
count++;
res >>= 1;
}
return count;
}
target_ulong helper_bsr(target_ulong t0)
{
int count;
target_ulong res, mask;
res = t0;
count = TARGET_LONG_BITS - 1;
mask = (target_ulong)1 << (TARGET_LONG_BITS - 1);
while ((res & mask) == 0) {
count--;
res <<= 1;
}
return count;
}
static int compute_all_eflags(void)
{
return CC_SRC;

2
target-i386/helper.h
View File

@ -187,6 +187,8 @@ void helper_fsave(target_ulong ptr, int data32);
void helper_frstor(target_ulong ptr, int data32);
void helper_fxsave(target_ulong ptr, int data64);
void helper_fxrstor(target_ulong ptr, int data64);
target_ulong helper_bsf(target_ulong t0);
target_ulong helper_bsr(target_ulong t0);
/* MMX/SSE */

45
target-i386/ops_template.h
View File

@ -200,51 +200,6 @@ void OPPROTO glue(op_setle_T0_sub, SUFFIX)(void)
T0 = ((DATA_STYPE)src1 <= (DATA_STYPE)src2);
}
/* bit operations */
#if DATA_BITS >= 16
void OPPROTO glue(glue(op_bsf, SUFFIX), _T0_cc)(void)
{
int count;
target_long res;
res = T0 & DATA_MASK;
if (res != 0) {
count = 0;
while ((res & 1) == 0) {
count++;
res >>= 1;
}
T1 = count;
CC_DST = 1; /* ZF = 0 */
} else {
CC_DST = 0; /* ZF = 1 */
}
FORCE_RET();
}
void OPPROTO glue(glue(op_bsr, SUFFIX), _T0_cc)(void)
{
int count;
target_long res;
res = T0 & DATA_MASK;
if (res != 0) {
count = DATA_BITS - 1;
while ((res & SIGN_MASK) == 0) {
count--;
res <<= 1;
}
T1 = count;
CC_DST = 1; /* ZF = 0 */
} else {
CC_DST = 0; /* ZF = 1 */
}
FORCE_RET();
}
#endif
/* string operations */
void OPPROTO glue(op_movl_T0_Dshift, SUFFIX)(void)

48
target-i386/translate.c
View File

@ -498,23 +498,6 @@ static GenOpFunc *gen_op_cmov_reg_T1_T0[NB_OP_SIZES - 1][CPU_NB_REGS] = {
#endif
};
static GenOpFunc *gen_op_bsx_T0_cc[3][2] = {
[0] = {
gen_op_bsfw_T0_cc,
gen_op_bsrw_T0_cc,
},
[1] = {
gen_op_bsfl_T0_cc,
gen_op_bsrl_T0_cc,
},
#ifdef TARGET_X86_64
[2] = {
gen_op_bsfq_T0_cc,
gen_op_bsrq_T0_cc,
},
#endif
};
static inline void gen_op_lds_T0_A0(int idx)
{
int mem_index = (idx >> 2) - 1;
@ -5837,16 +5820,27 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
break;
case 0x1bc: /* bsf */
case 0x1bd: /* bsr */
ot = dflag + OT_WORD;
modrm = ldub_code(s->pc++);
reg = ((modrm >> 3) & 7) | rex_r;
gen_ldst_modrm(s, modrm, ot, OR_TMP0, 0);
/* NOTE: in order to handle the 0 case, we must load the
result. It could be optimized with a generated jump */
gen_op_mov_TN_reg(ot, 1, reg);
gen_op_bsx_T0_cc[ot - OT_WORD][b & 1]();
gen_op_mov_reg_T1(ot, reg);
s->cc_op = CC_OP_LOGICB + ot;
{
int label1;
ot = dflag + OT_WORD;
modrm = ldub_code(s->pc++);
reg = ((modrm >> 3) & 7) | rex_r;
gen_ldst_modrm(s, modrm, ot, OR_TMP0, 0);
gen_extu(ot, cpu_T[0]);
label1 = gen_new_label();
tcg_gen_movi_tl(cpu_cc_dst, 0);
tcg_gen_brcond_tl(TCG_COND_EQ, cpu_T[0], tcg_const_tl(0), label1);
if (b & 1) {
tcg_gen_helper_1_1(helper_bsr, cpu_T[0], cpu_T[0]);
} else {
tcg_gen_helper_1_1(helper_bsf, cpu_T[0], cpu_T[0]);
}
gen_op_mov_reg_T0(ot, reg);
tcg_gen_movi_tl(cpu_cc_dst, 1);
gen_set_label(label1);
tcg_gen_discard_tl(cpu_cc_src);
s->cc_op = CC_OP_LOGICB + ot;
}
break;
/************************/
/* bcd */