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[dev.power64] 9g: fix addr width calculation; enable MOV* width check

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9g's naddr was missing assignments to a->width in several
cases, so the optimizer was getting bogus width information.
Add them.

This correct width information also lets us enable the width
check in gins for MOV*.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/167310043
This commit is contained in:
Austin Clements 2014-11-06 14:41:44 -05:00
parent f45fd5753c
commit 22c929f538
1 changed files with 13 additions and 12 deletions
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25
src/cmd/9g/gsubr.c
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@ -1001,10 +1001,13 @@ hard:
Prog*
gins(int as, Node *f, Node *t)
{
//int32 w;
int32 w;
Prog *p;
Addr af, at;
// TODO(austin): Add self-move test like in 6g (but be careful
// of truncation moves)
memset(&af, 0, sizeof af);
memset(&at, 0, sizeof at);
if(f != N)
@ -1021,9 +1024,6 @@ gins(int as, Node *f, Node *t)
if(debug['g'])
print("%P\n", p);
// TODO(minux): enable these.
// right now it fails on MOVD $type."".TypeAssertionError(SB) [width=1], R7 [width=8]
/*
w = 0;
switch(as) {
case AMOVB:
@ -1049,12 +1049,11 @@ gins(int as, Node *f, Node *t)
w = 8;
break;
}
if(w != 0 && ((f != N && af.width < w) || (t != N && at.width > w))) {
if(w != 0 && ((f != N && af.width < w) || (t != N && at.type != D_REG && at.width > w))) {
dump("f", f);
dump("t", t);
fatal("bad width: %P (%d, %d)\n", p, af.width, at.width);
}
*/
return p;
}
@ -1116,12 +1115,9 @@ naddr(Node *n, Addr *a, int canemitcode)
case ONAME:
a->etype = 0;
a->width = 0;
a->reg = NREG;
if(n->type != T) {
if(n->type != T)
a->etype = simtype[n->type->etype];
a->width = n->type->width;
}
a->offset = n->xoffset;
s = n->sym;
a->node = n->orig;
@ -1242,15 +1238,16 @@ naddr(Node *n, Addr *a, int canemitcode)
naddr(n->left, a, canemitcode);
a->etype = simtype[tptr];
if(a->type == D_CONST && a->offset == 0)
break; // len(nil)
break; // itab(nil)
a->width = widthptr;
break;
case OSPTR:
// pointer in a string or slice
naddr(n->left, a, canemitcode);
a->etype = simtype[tptr];
if(a->type == D_CONST && a->offset == 0)
break; // ptr(nil)
a->etype = simtype[tptr];
a->offset += Array_array;
a->width = widthptr;
break;
@ -1262,6 +1259,7 @@ naddr(Node *n, Addr *a, int canemitcode)
if(a->type == D_CONST && a->offset == 0)
break; // len(nil)
a->offset += Array_nel;
a->width = widthint;
break;
case OCAP:
@ -1271,11 +1269,13 @@ naddr(Node *n, Addr *a, int canemitcode)
if(a->type == D_CONST && a->offset == 0)
break; // cap(nil)
a->offset += Array_cap;
a->width = widthint;
break;
case OADDR:
naddr(n->left, a, canemitcode);
a->etype = tptr;
a->width = widthptr;
switch(a->type) {
case D_OREG:
a->type = D_CONST;
@ -1288,6 +1288,7 @@ naddr(Node *n, Addr *a, int canemitcode)
default:
fatal("naddr: OADDR %d\n", a->type);
}
break;
}
}