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Rearrange code for better performance

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This commit is contained in:
Dmitry Stogov 2023-07-26 22:32:14 +03:00
parent 0f12ea8c71
commit c2a53d29fa
1 changed files with 27 additions and 14 deletions
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41
dynasm/dasm_x86.h
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@ -189,9 +189,11 @@ void dasm_put(Dst_DECL, int start, ...)
va_start(ap, start);
while (1) {
int action = *p++;
if (action < DASM_DISP) {
while (action < DASM_DISP) {
ofs++;
} else if (action <= DASM_REL_A) {
action = *p++;
}
if (action <= DASM_REL_A) {
int n = va_arg(ap, int);
b[pos++] = n;
switch (action) {
@ -314,6 +316,10 @@ int dasm_link(Dst_DECL, size_t *szp)
int op = 0;
while (1) {
int action = *p++;
while (action < DASM_DISP) {
op = action;
action = *p++;
}
switch (action) {
case DASM_REL_LG: p++;
/* fallthrough */
@ -351,7 +357,6 @@ int dasm_link(Dst_DECL, size_t *szp)
case DASM_ESC: op = *p++; break;
case DASM_MARK: break;
case DASM_SECTION: case DASM_STOP: goto stop;
default: op = action; break;
}
}
stop: (void)0;
@ -408,8 +413,26 @@ int dasm_encode(Dst_DECL, void *buffer)
dasm_ActList p = D->actionlist + *b++;
unsigned char *mark = NULL;
while (1) {
int n;
int action = *p++;
int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0;
while (action < DASM_DISP) {
*cp++ = action;
action = *p++;
}
if (action >= DASM_ALIGN) {
switch (action) {
case DASM_ALIGN:
b++;
n = *p++;
while (((cp-base) & n)) *cp++ = 0x90; /* nop */
continue;
case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;
case DASM_MARK: mark = cp; continue;
case DASM_ESC: action = *p++; *cp++ = action; continue;
case DASM_SECTION: case DASM_STOP: goto stop;
}
}
n = *b++;
switch (action) {
case DASM_DISP: if (!mark) mark = cp; {
unsigned char *mm = mark;
@ -479,16 +502,6 @@ int dasm_encode(Dst_DECL, void *buffer)
}
case DASM_LABEL_PC: case DASM_SETLABEL: break;
case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; }
case DASM_ALIGN:
n = *p++;
while (((cp-base) & n)) *cp++ = 0x90; /* nop */
break;
case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;
case DASM_MARK: mark = cp; break;
case DASM_ESC: action = *p++;
/* fallthrough */
default: *cp++ = action; break;
case DASM_SECTION: case DASM_STOP: goto stop;
}
}
stop: (void)0;