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cmd/5g, cmd/6g, cmd/8g: delete clearstk

Browse Source 
Dreg from https://golang.org/cl/4629042

R=ken2
CC=golang-dev
https://golang.org/cl/6259057
This commit is contained in:
Russ Cox 2012-06-01 10:10:59 -04:00
parent 935d8d16d4
commit 96b0594833
3 changed files with 0 additions and 134 deletions
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58
src/cmd/5g/gsubr.c
View File

@ -174,64 +174,6 @@ newplist(void)
return pl; return pl;
} }
void
clearstk(void)
{
Plist *pl;
Prog *p, *p1, *p2, *p3;
Node dst, end, zero, con;
if(plast->firstpc->to.offset <= 0)
return;
// reestablish context for inserting code
// at beginning of function.
pl = plast;
p1 = pl->firstpc;
p2 = p1->link;
pc = mal(sizeof(*pc));
clearp(pc);
p1->link = pc;
// zero stack frame
// MOVW $4(SP), R1
nodreg(&dst, types[tptr], 1);
p = gins(AMOVW, N, &dst);
p->from.type = D_CONST;
p->from.reg = REGSP;
p->from.offset = 4;
// MOVW $n(R1), R2
nodreg(&end, types[tptr], 2);
p = gins(AMOVW, N, &end);
p->from.type = D_CONST;
p->from.reg = 1;
p->from.offset = p1->to.offset;
// MOVW $0, R3
nodreg(&zero, types[TUINT32], 3);
nodconst(&con, types[TUINT32], 0);
gmove(&con, &zero);
// L:
// MOVW.P R3, 0(R1) +4
// CMP R1, R2
// BNE L
p = gins(AMOVW, &zero, &dst);
p->to.type = D_OREG;
p->to.offset = 4;
p->scond |= C_PBIT;
p3 = p;
p = gins(ACMP, &dst, N);
raddr(&end, p);
patch(gbranch(ABNE, T, 0), p3);
// continue with original code.
gins(ANOP, N, N)->link = p2;
pc = P;
}
void void
gused(Node *n) gused(Node *n)
{ {

38
src/cmd/6g/gsubr.c
View File

@ -172,44 +172,6 @@ newplist(void)
return pl; return pl;
} }
void
clearstk(void)
{
Plist *pl;
Prog *p1, *p2;
Node sp, di, cx, con, ax;
if((uint32)plast->firstpc->to.offset <= 0)
return;
// reestablish context for inserting code
// at beginning of function.
pl = plast;
p1 = pl->firstpc;
p2 = p1->link;
pc = mal(sizeof(*pc));
clearp(pc);
p1->link = pc;
// zero stack frame
nodreg(&sp, types[tptr], D_SP);
nodreg(&di, types[tptr], D_DI);
nodreg(&cx, types[TUINT64], D_CX);
nodconst(&con, types[TUINT64], (uint32)p1->to.offset / widthptr);
gins(ACLD, N, N);
gins(AMOVQ, &sp, &di);
gins(AMOVQ, &con, &cx);
nodconst(&con, types[TUINT64], 0);
nodreg(&ax, types[TUINT64], D_AX);
gins(AMOVQ, &con, &ax);
gins(AREP, N, N);
gins(ASTOSQ, N, N);
// continue with original code.
gins(ANOP, N, N)->link = p2;
pc = P;
}
void void
gused(Node *n) gused(Node *n)
{ {

38
src/cmd/8g/gsubr.c
View File

@ -173,44 +173,6 @@ newplist(void)
return pl; return pl;
} }
void
clearstk(void)
{
Plist *pl;
Prog *p1, *p2;
Node sp, di, cx, con, ax;
if(plast->firstpc->to.offset <= 0)
return;
// reestablish context for inserting code
// at beginning of function.
pl = plast;
p1 = pl->firstpc;
p2 = p1->link;
pc = mal(sizeof(*pc));
clearp(pc);
p1->link = pc;
// zero stack frame
nodreg(&sp, types[tptr], D_SP);
nodreg(&di, types[tptr], D_DI);
nodreg(&cx, types[TUINT32], D_CX);
nodconst(&con, types[TUINT32], p1->to.offset / widthptr);
gins(ACLD, N, N);
gins(AMOVL, &sp, &di);
gins(AMOVL, &con, &cx);
nodconst(&con, types[TUINT32], 0);
nodreg(&ax, types[TUINT32], D_AX);
gins(AMOVL, &con, &ax);
gins(AREP, N, N);
gins(ASTOSL, N, N);
// continue with original code.
gins(ANOP, N, N)->link = p2;
pc = P;
}
void void
gused(Node *n) gused(Node *n)
{ {