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Commit 837c204a authored by Russ Cox's avatar Russ Cox
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6l, 8l: avoid recursion in asmandsz 

The old code said

	if(x) {
		handle a
		return
	}
	aa = *a
	rewrite aa to make x true
	recursivecall(&aa)

The new code says

	params = copy out of a
	if(!x) {
		rewrite params to make x true
	}
	handle params

but it's hard to see that in the Rietveld diffs because
it gets confused by changes in indentation.

Avoiding the recursion makes other changes easier.

R=ken2
CC=golang-dev
https://golang.org/cl/2533041
parent be2c2120
Show whitespace changes
Inline Side-by-side
Showing with 92 additions and 101 deletions
src/cmd/6l/span.c
View file @ 837c204a
......@@ -531,11 +531,11 @@ oclass(Adr *a)
}
void
asmidx(Adr *a, int base)
asmidx(int scale, int index, int base)
{
int i;
switch(a->index) {
switch(index) {
default:
goto bad;
......@@ -560,10 +560,10 @@ asmidx(Adr *a, int base)
case D_BP:
case D_SI:
case D_DI:
i = reg[(int)a->index] << 3;
i = reg[index] << 3;
break;
}
switch(a->scale) {
switch(scale) {
default:
goto bad;
case 1:
......@@ -609,7 +609,7 @@ bas:
*andptr++ = i;
return;
bad:
diag("asmidx: bad address %D", a);
diag("asmidx: bad address %d/%d/%d", scale, index, base);
*andptr++ = 0;
return;
}
......@@ -689,65 +689,78 @@ static void
asmandsz(Adr *a, int r, int rex, int m64)
{
int32 v;
int t;
Adr aa;
int t, scale;
rex &= (0x40 | Rxr);
v = a->offset;
t = a->type;
if(a->index != D_NONE) {
if(t >= D_INDIR) {
if(t < D_INDIR) {
switch(t) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
t = D_NONE;
v = vaddr(a);
break;
case D_AUTO:
case D_PARAM:
t = D_SP;
break;
}
} else
t -= D_INDIR;
rexflag |= (regrex[(int)a->index] & Rxx) | (regrex[t] & Rxb) | rex;
if(t == D_NONE) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
put4(v);
return;
}
if(v == 0 && t != D_BP && t != D_R13) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
put4(v);
return;
}
switch(t) {
if(t >= D_AL && t <= D_X0+15) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
rexflag |= (regrex[t] & (0x40 | Rxb)) | rex;
return;
}
scale = a->scale;
if(t < D_INDIR) {
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
t = D_NONE;
v = vaddr(a);
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
t = D_SP;
break;
}
aa.offset = vaddr(a);
aa.index = a->index;
aa.scale = a->scale;
asmandsz(&aa, r, rex, m64);
return;
}
if(t >= D_AL && t <= D_X0+15) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
rexflag |= (regrex[t] & (0x40 | Rxb)) | rex;
return;
}
if(t >= D_INDIR) {
scale = 1;
} else
t -= D_INDIR;
rexflag |= (regrex[t] & Rxb) | rex;
if(t == D_NONE || (D_CS <= t && t <= D_GS)) {
if(asmode != 64){
......@@ -764,17 +777,17 @@ asmandsz(Adr *a, int r, int rex, int m64)
if(t == D_SP || t == D_R12) {
if(v == 0) {
*andptr++ = (0 << 6) | (reg[t] << 0) | (r << 3);
asmidx(a, t);
asmidx(scale, D_NONE, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (reg[t] << 0) | (r << 3);
asmidx(a, t);
asmidx(scale, D_NONE, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (reg[t] << 0) | (r << 3);
asmidx(a, t);
asmidx(scale, D_NONE, t);
put4(v);
return;
}
......@@ -793,25 +806,7 @@ asmandsz(Adr *a, int r, int rex, int m64)
put4(v);
return;
}
goto bad;
}
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
break;
}
aa.index = D_NONE;
aa.scale = 1;
aa.offset = vaddr(a);
asmandsz(&aa, r, rex, m64);
return;
bad:
diag("asmand: bad address %D", a);
return;
......
src/cmd/8l/span.c
View file @ 837c204a
......@@ -405,11 +405,11 @@ oclass(Adr *a)
}
void
asmidx(Adr *a, int base)
asmidx(int scale, int index, int base)
{
int i;
switch(a->index) {
switch(index) {
default:
goto bad;
......@@ -424,10 +424,10 @@ asmidx(Adr *a, int base)
case D_BP:
case D_SI:
case D_DI:
i = reg[a->index] << 3;
i = reg[index] << 3;
break;
}
switch(a->scale) {
switch(scale) {
default:
goto bad;
case 1:
......@@ -463,7 +463,7 @@ bas:
*andptr++ = i;
return;
bad:
diag("asmidx: bad address %D", a);
diag("asmidx: bad address %d,%d,%d", scale, index, base);
*andptr++ = 0;
return;
}
......@@ -530,62 +530,76 @@ void
asmand(Adr *a, int r)
{
int32 v;
int t;
Adr aa;
int t, scale;
v = a->offset;
t = a->type;
if(a->index != D_NONE) {
if(t >= D_INDIR && t < 2*D_INDIR) {
if(t < D_INDIR || t >= 2*D_INDIR) {
switch(t) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
t = D_NONE;
v = vaddr(a);
break;
case D_AUTO:
case D_PARAM:
t = D_SP;
break;
}
} else
t -= D_INDIR;
if(t == D_NONE) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
put4(v);
return;
}
if(v == 0 && t != D_BP) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
asmidx(a->scale, a->index, t);
put4(v);
return;
}
switch(t) {
if(t >= D_AL && t <= D_F0+7) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
return;
}
scale = a->scale;
if(t < D_INDIR || t >= 2*D_INDIR) {
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
t = D_NONE;
v = vaddr(a);
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
t = D_SP;
break;
}
aa.offset = vaddr(a);
aa.index = a->index;
aa.scale = a->scale;
asmand(&aa, r);
return;
}
if(t >= D_AL && t <= D_F0+7) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
return;
}
if(t >= D_INDIR && t < 2*D_INDIR) {
scale = 1;
} else
t -= D_INDIR;
if(t == D_NONE || (D_CS <= t && t <= D_GS)) {
*andptr++ = (0 << 6) | (5 << 0) | (r << 3);
put4(v);
......@@ -594,17 +608,17 @@ asmand(Adr *a, int r)
if(t == D_SP) {
if(v == 0) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
asmidx(scale, D_NONE, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
asmidx(scale, D_NONE, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
asmidx(scale, D_NONE, t);
put4(v);
return;
}
......@@ -623,25 +637,7 @@ asmand(Adr *a, int r)
put4(v);
return;
}
goto bad;
}
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
break;
}
aa.index = D_NONE;
aa.scale = 1;
aa.offset = vaddr(a);
asmand(&aa, r);
return;
bad:
diag("asmand: bad address %D", a);
return;
......
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