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better job on 2007043

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better registerization

R=rsc
CC=golang-dev
https://golang.org/cl/1955049
This commit is contained in:
Ken Thompson 2010-08-23 12:38:15 -07:00
parent 534dbc738f
commit 96cbdd62b6
1 changed files with 46 additions and 12 deletions
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56
src/cmd/6g/cgen.c
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@ -1109,6 +1109,22 @@ sgen(Node *n, Node *ns, int32 w)
restx(&cx, &oldcx);
}
static int
cadable(Node *n)
{
if(!n->addable) {
// dont know how it happens,
// but it does
return 0;
}
switch(n->op) {
case ONAME:
return 1;
}
return 0;
}
/*
* copy a structure component by component
* return 1 if can do, 0 if cant.
@ -1118,20 +1134,36 @@ int
componentgen(Node *nr, Node *nl)
{
Node nodl, nodr;
int free;
int freel, freer;
free = 0;
if(!nl->addable || nl->op != ONAME)
freel = 0;
freer = 0;
switch(nl->type->etype) {
default:
goto no;
case TARRAY:
if(!isslice(nl->type))
goto no;
case TSTRING:
case TINTER:
break;
}
nodl = *nl;
if(nr != N) {
if(!nr->addable || nr->op != ONAME)
if(!cadable(nl)) {
if(nr == N || !cadable(nr))
goto no;
igen(nl, &nodl, N);
freel = 1;
}
if(nr != N) {
nodr = *nr;
if(nr->op != ONAME && nr->op != OINDREG) {
if(!cadable(nr)) {
igen(nr, &nodr, N);
free = 1;
freer = 1;
}
}
@ -1173,7 +1205,6 @@ componentgen(Node *nr, Node *nl)
goto yes;
case TSTRING:
nodl.xoffset += Array_array;
nodl.type = ptrto(types[TUINT8]);
@ -1197,7 +1228,6 @@ componentgen(Node *nr, Node *nl)
goto yes;
case TINTER:
nodl.xoffset += Array_array;
nodl.type = ptrto(types[TUINT8]);
@ -1225,12 +1255,16 @@ componentgen(Node *nr, Node *nl)
}
no:
if(free)
if(freer)
regfree(&nodr);
if(freel)
regfree(&nodl);
return 0;
yes:
if(free)
if(freer)
regfree(&nodr);
if(freel)
regfree(&nodl);
return 1;
}