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cmd/5g, cmd/6g: pass the full torture test.

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The patch adds more cases to agenr to allocate registers later,
and makes 6g generate addresses for sgen in something else than
SI and DI. It avoids a complex save/restore sequence that
amounts to allocate a register before descending in subtrees.

Fixes #4207.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6817080
This commit is contained in:
Rémy Oudompheng 2012-11-12 23:56:11 +01:00
parent 80f4ff226f
commit eb4f4d16ae
4 changed files with 57 additions and 34 deletions
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15
src/cmd/5g/cgen.c
View file

@ -893,6 +893,21 @@ agenr(Node *n, Node *a, Node *res)
nr = n->right;
switch(n->op) {
case ODOT:
case ODOTPTR:
case OCALLFUNC:
case OCALLMETH:
case OCALLINTER:
igen(n, &n1, res);
regalloc(a, types[tptr], &n1);
agen(&n1, a);
regfree(&n1);
break;
case OIND:
cgenr(n->left, a, res);
break;
case OINDEX:
p2 = nil; // to be patched to panicindex.
w = n->type->width;

1
src/cmd/5g/gsubr.c
View file

@ -361,6 +361,7 @@ regalloc(Node *n, Type *t, Node *o)
regpc[i] = (uintptr)getcallerpc(&n);
goto out;
}
print("registers allocated at\n");
for(i=REGALLOC_R0; i<=REGALLOC_RMAX; i++)
print("%d %p\n", i, regpc[i]);
yyerror("out of fixed registers");

44
src/cmd/6g/cgen.c
View file

@ -576,6 +576,21 @@ agenr(Node *n, Node *a, Node *res)
nr = n->right;
switch(n->op) {
case ODOT:
case ODOTPTR:
case OCALLFUNC:
case OCALLMETH:
case OCALLINTER:
igen(n, &n1, res);
regalloc(a, types[tptr], &n1);
agen(&n1, a);
regfree(&n1);
break;
case OIND:
cgenr(n->left, a, res);
break;
case OINDEX:
freelen = 0;
w = n->type->width;
@ -1309,7 +1324,7 @@ stkof(Node *n)
void
sgen(Node *n, Node *ns, int64 w)
{
Node nodl, nodr, oldl, oldr, cx, oldcx, tmp;
Node nodl, nodr, nodsi, noddi, cx, oldcx, tmp;
int32 c, q, odst, osrc;
if(debug['g']) {
@ -1353,22 +1368,18 @@ sgen(Node *n, Node *ns, int64 w)
}
if(n->ullman >= ns->ullman) {
savex(D_SI, &nodr, &oldr, N, types[tptr]);
agen(n, &nodr);
regalloc(&nodr, types[tptr], &nodr); // mark nodr as live
savex(D_DI, &nodl, &oldl, N, types[tptr]);
agen(ns, &nodl);
regfree(&nodr);
agenr(n, &nodr, N);
agenr(ns, &nodl, N);
} else {
savex(D_DI, &nodl, &oldl, N, types[tptr]);
agen(ns, &nodl);
regalloc(&nodl, types[tptr], &nodl); // mark nodl as live
savex(D_SI, &nodr, &oldr, N, types[tptr]);
agen(n, &nodr);
regfree(&nodl);
agenr(ns, &nodl, N);
agenr(n, &nodr, N);
}
nodreg(&noddi, types[tptr], D_DI);
nodreg(&nodsi, types[tptr], D_SI);
gmove(&nodl, &noddi);
gmove(&nodr, &nodsi);
regfree(&nodl);
regfree(&nodr);
c = w % 8; // bytes
q = w / 8; // quads
@ -1425,9 +1436,6 @@ sgen(Node *n, Node *ns, int64 w)
}
}
restx(&nodl, &oldl);
restx(&nodr, &oldr);
restx(&cx, &oldcx);
}

31
test/torture.go
View file

@ -279,12 +279,12 @@ func ChainAssertArrayIndex(u *UArr) J {
Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
// Children[0].(*UArr).
// Children[0].(*UArr).
// Children[0].(*UArr).
// Children[0].(*UArr).
// Children[0].(*UArr).
// Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
Children[0].(*UArr).
Children[0]
}
@ -295,21 +295,20 @@ type UArrPtr struct {
func (u *UArrPtr) Child(n int) J { return u.Children[n] }
func ChainAssertArrayptrIndex(u *UArrPtr) J {
// TODO: don't crash on longer chains.
return u.
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
// Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0].(*UArrPtr).
Children[0]
}