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use direct jump only for jumps in the same page

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1629 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-11-20 10:32:05 +00:00
parent c1942362bc
commit 6e256c935c
4 changed files with 110 additions and 72 deletions
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53
target-i386/translate.c
View file

@ -1700,6 +1700,31 @@ static inline int insn_const_size(unsigned int ot)
return 4;
}
static inline void gen_goto_tb(DisasContext *s, int tb_num, target_ulong eip)
{
TranslationBlock *tb;
target_ulong pc;
pc = s->cs_base + eip;
tb = s->tb;
/* NOTE: we handle the case where the TB spans two pages here */
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) ||
(pc & TARGET_PAGE_MASK) == ((s->pc - 1) & TARGET_PAGE_MASK)) {
/* jump to same page: we can use a direct jump */
if (tb_num == 0)
gen_op_goto_tb0(TBPARAM(tb));
else
gen_op_goto_tb1(TBPARAM(tb));
gen_jmp_im(eip);
gen_op_movl_T0_im((long)tb + tb_num);
gen_op_exit_tb();
} else {
/* jump to another page: currently not optimized */
gen_jmp_im(eip);
gen_eob(s);
}
}
static inline void gen_jcc(DisasContext *s, int b,
target_ulong val, target_ulong next_eip)
{
@ -1779,8 +1804,10 @@ static inline void gen_jcc(DisasContext *s, int b,
break;
}
if (s->cc_op != CC_OP_DYNAMIC)
if (s->cc_op != CC_OP_DYNAMIC) {
gen_op_set_cc_op(s->cc_op);
s->cc_op = CC_OP_DYNAMIC;
}
if (!func) {
gen_setcc_slow[jcc_op]();
@ -1797,16 +1824,10 @@ static inline void gen_jcc(DisasContext *s, int b,
l1 = gen_new_label();
func(l1);
gen_op_goto_tb0(TBPARAM(tb));
gen_jmp_im(next_eip);
gen_op_movl_T0_im((long)tb + 0);
gen_op_exit_tb();
gen_goto_tb(s, 0, next_eip);
gen_set_label(l1);
gen_op_goto_tb1(TBPARAM(tb));
gen_jmp_im(val);
gen_op_movl_T0_im((long)tb + 1);
gen_op_exit_tb();
gen_goto_tb(s, 1, val);
s->is_jmp = 3;
} else {
@ -2217,18 +2238,12 @@ static void gen_eob(DisasContext *s)
direct call to the next block may occur */
static void gen_jmp_tb(DisasContext *s, target_ulong eip, int tb_num)
{
TranslationBlock *tb = s->tb;
if (s->jmp_opt) {
if (s->cc_op != CC_OP_DYNAMIC)
if (s->cc_op != CC_OP_DYNAMIC) {
gen_op_set_cc_op(s->cc_op);
if (tb_num)
gen_op_goto_tb1(TBPARAM(tb));
else
gen_op_goto_tb0(TBPARAM(tb));
gen_jmp_im(eip);
gen_op_movl_T0_im((long)tb + tb_num);
gen_op_exit_tb();
s->cc_op = CC_OP_DYNAMIC;
}
gen_goto_tb(s, tb_num, eip);
s->is_jmp = 3;
} else {
gen_jmp_im(eip);