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Optimize runtime assembler with shorter equivalents when the accumulator

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(%eax) is referenced along with immediates.
This commit is contained in:
gbeauche 2002-09-18 15:56:17 +00:00
parent f2a9938685
commit feca66d43e
1 changed files with 75 additions and 15 deletions
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90
BasiliskII/src/uae_cpu/compiler/codegen_x86.cpp
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@ -95,6 +95,7 @@ uae_u8 need_to_preserve[]={1,1,1,1,0,1,1,1};
#define CLOBBER_BT clobber_flags()
#define CLOBBER_BSF clobber_flags()
const bool optimize_accum = true;
const bool optimize_imm8 = true;
const bool optimize_shift_once = true;
@ -102,6 +103,11 @@ const bool optimize_shift_once = true;
* Actual encoding of the instructions on the target CPU *
*************************************************************************/
static __inline__ int isaccum(int r)
{
return (r == EAX_INDEX);
}
static __inline__ int isbyte(uae_s32 x)
{
return (x>=-128 && x<=127);
@ -202,8 +208,12 @@ LOWFUNC(WRITE,NONE,2,raw_sub_w_ri,(RW2 d, IMM i))
emit_byte(i);
}
else {
if (optimize_accum && isaccum(d))
emit_byte(0x2d);
else {
emit_byte(0x81);
emit_byte(0xe8+d);
}
emit_word(i);
}
}
@ -1371,8 +1381,12 @@ LENDFUNC(WRITE,RMW,2,raw_add_b_mi,(IMM d, IMM s))
LOWFUNC(WRITE,NONE,2,raw_test_l_ri,(R4 d, IMM i))
{
if (optimize_accum && isaccum(d))
emit_byte(0xa9);
else {
emit_byte(0xf7);
emit_byte(0xc0+d);
}
emit_long(i);
}
LENDFUNC(WRITE,NONE,2,raw_test_l_ri,(R4 d, IMM i))
@ -1402,24 +1416,39 @@ LENDFUNC(WRITE,NONE,2,raw_test_b_rr,(R1 d, R1 s))
LOWFUNC(WRITE,NONE,2,raw_and_l_ri,(RW4 d, IMM i))
{
if (optimize_imm8 && isbyte(i)) {
emit_byte(0x83);
emit_byte(0xe0+d);
emit_byte(i);
emit_byte(0x83);
emit_byte(0xe0+d);
emit_byte(i);
}
else {
emit_byte(0x81);
emit_byte(0xe0+d);
emit_long(i);
if (optimize_accum && isaccum(d))
emit_byte(0x25);
else {
emit_byte(0x81);
emit_byte(0xe0+d);
}
emit_long(i);
}
}
LENDFUNC(WRITE,NONE,2,raw_and_l_ri,(RW4 d, IMM i))
LOWFUNC(WRITE,NONE,2,raw_and_w_ri,(RW2 d, IMM i))
{
emit_byte(0x66);
emit_byte(0x81);
emit_byte(0xe0+d);
emit_word(i);
emit_byte(0x66);
if (optimize_imm8 && isbyte(i)) {
emit_byte(0x83);
emit_byte(0xe0+d);
emit_byte(i);
}
else {
if (optimize_accum && isaccum(d))
emit_byte(0x25);
else {
emit_byte(0x81);
emit_byte(0xe0+d);
}
emit_word(i);
}
}
LENDFUNC(WRITE,NONE,2,raw_and_w_ri,(RW2 d, IMM i))
@ -1453,8 +1482,12 @@ LOWFUNC(WRITE,NONE,2,raw_or_l_ri,(RW4 d, IMM i))
emit_byte(i);
}
else {
if (optimize_accum && isaccum(d))
emit_byte(0x0d);
else {
emit_byte(0x81);
emit_byte(0xc8+d);
}
emit_long(i);
}
}
@ -1534,8 +1567,12 @@ LOWFUNC(WRITE,NONE,2,raw_sub_l_ri,(RW4 d, IMM i))
emit_byte(i);
}
else {
if (optimize_accum && isaccum(d))
emit_byte(0x2d);
else {
emit_byte(0x81);
emit_byte(0xe8+d);
}
emit_long(i);
}
}
@ -1543,8 +1580,12 @@ LENDFUNC(WRITE,NONE,2,raw_sub_l_ri,(RW4 d, IMM i))
LOWFUNC(WRITE,NONE,2,raw_sub_b_ri,(RW1 d, IMM i))
{
if (optimize_accum && isaccum(d))
emit_byte(0x2c);
else {
emit_byte(0x80);
emit_byte(0xe8+d);
}
emit_byte(i);
}
LENDFUNC(WRITE,NONE,2,raw_sub_b_ri,(RW1 d, IMM i))
@ -1557,8 +1598,12 @@ LOWFUNC(WRITE,NONE,2,raw_add_l_ri,(RW4 d, IMM i))
emit_byte(i);
}
else {
if (optimize_accum && isaccum(d))
emit_byte(0x05);
else {
emit_byte(0x81);
emit_byte(0xc0+d);
}
emit_long(i);
}
}
@ -1566,16 +1611,19 @@ LENDFUNC(WRITE,NONE,2,raw_add_l_ri,(RW4 d, IMM i))
LOWFUNC(WRITE,NONE,2,raw_add_w_ri,(RW2 d, IMM i))
{
if (isbyte(i)) {
emit_byte(0x66);
if (isbyte(i)) {
emit_byte(0x83);
emit_byte(0xc0+d);
emit_byte(i);
}
else {
emit_byte(0x66);
if (optimize_accum && isaccum(d))
emit_byte(0x05);
else {
emit_byte(0x81);
emit_byte(0xc0+d);
}
emit_word(i);
}
}
@ -1583,8 +1631,12 @@ LENDFUNC(WRITE,NONE,2,raw_add_w_ri,(RW2 d, IMM i))
LOWFUNC(WRITE,NONE,2,raw_add_b_ri,(RW1 d, IMM i))
{
emit_byte(0x80);
emit_byte(0xc0+d);
if (optimize_accum && isaccum(d))
emit_byte(0x04);
else {
emit_byte(0x80);
emit_byte(0xc0+d);
}
emit_byte(i);
}
LENDFUNC(WRITE,NONE,2,raw_add_b_ri,(RW1 d, IMM i))
@ -1648,8 +1700,12 @@ LOWFUNC(WRITE,NONE,2,raw_cmp_l_ri,(R4 r, IMM i))
emit_byte(i);
}
else {
if (optimize_accum && isaccum(r))
emit_byte(0x3d);
else {
emit_byte(0x81);
emit_byte(0xf8+r);
}
emit_long(i);
}
}
@ -1665,8 +1721,12 @@ LENDFUNC(WRITE,NONE,2,raw_cmp_w,(R2 d, R2 s))
LOWFUNC(WRITE,NONE,2,raw_cmp_b_ri,(R1 d, IMM i))
{
if (optimize_accum && isaccum(d))
emit_byte(0x3c);
else {
emit_byte(0x80);
emit_byte(0xf8+d);
}
emit_byte(i);
}
LENDFUNC(WRITE,NONE,2,raw_cmp_b_ri,(R1 d, IMM i))
@ -2034,7 +2094,7 @@ static __inline__ void raw_load_flagx(uae_u32 target, uae_u32 r)
static __inline__ void raw_inc_sp(int off)
{
raw_add_l_ri(4,off);
raw_add_l_ri(ESP_INDEX,off);
}
/*************************************************************************