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fix my sloppy understanding of x86 assembly!

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This commit is contained in:
Quentin Carbonneaux 2015-08-11 13:40:54 -04:00
parent 03785fbc9a
commit ec5042148e
2 changed files with 30 additions and 38 deletions
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47
lisc/emit.c
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@ -79,11 +79,26 @@ cneg(int cmp)
}
}
static void
econ(Con *c, FILE *f)
{
switch (c->type) {
case CAddr:
fprintf(f, "%s", c->label);
if (c->val)
fprintf(f, "%+"PRId64, c->val);
break;
case CNum:
fprintf(f, "%"PRId64, c->val);
break;
default:
diag("econ: invalid constant");
}
}
static void
eref(Ref r, Fn *fn, FILE *f)
{
Con *c;
switch (rtype(r)) {
case RReg:
fprintf(f, "%%%s", rtoa[r.val]);
@ -92,19 +107,8 @@ eref(Ref r, Fn *fn, FILE *f)
fprintf(f, "-%d(%%rbp)", 8 * r.val);
break;
case RCon:
c = &fn->con[r.val];
switch (c->type) {
case CAddr:
fprintf(f, "$%s", c->label);
if (c->val)
fprintf(f, "%+"PRId64, c->val);
break;
case CNum:
fprintf(f, "$%"PRId64, c->val);
break;
default:
diag("emitref: invalid constant");
}
fprintf(f, "$");
econ(&fn->con[r.val], f);
break;
default:
diag("emitref: invalid reference");
@ -114,10 +118,17 @@ eref(Ref r, Fn *fn, FILE *f)
static void
emem(Ref r, Fn *fn, FILE *f)
{
if (rtype(r) == RSlot)
switch (rtype(r)) {
default:
diag("emem: invalid memory reference");
case RSlot:
eref(r, fn, f);
else {
assert(rtype(r)!=RReg || BASE(r.val)==r.val);
break;
case RCon:
econ(&fn->con[r.val], f);
break;
case RReg:
assert(BASE(r.val) == r.val);
fprintf(f, "(");
eref(r, fn, f);
fprintf(f, ")");