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new rsval() helper for signed Refs

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The .val field is signed in RSlot.
Add a new dedicated function to
fetch it as a signed int.
This commit is contained in:
Quentin Carbonneaux 2022-12-12 17:36:15 +01:00
parent 2ec355df6a
commit c0f25aeae3
5 changed files with 31 additions and 23 deletions
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23
amd64/emit.c
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@ -142,20 +142,19 @@ static char *rname[][4] = {
static int
slot(int s, Fn *fn)
slot(Ref r, Fn *fn)
{
struct { int i:29; } x;
int s;
/* sign extend s using a bitfield */
x.i = s;
assert(x.i <= fn->slot);
s = rsval(r);
assert(s <= fn->slot);
/* specific to NAlign == 3 */
if (x.i < 0)
return -4 * x.i;
if (s < 0)
return -4 * s;
else if (fn->vararg)
return -176 + -4 * (fn->slot - x.i);
return -176 + -4 * (fn->slot - s);
else
return -4 * (fn->slot - x.i);
return -4 * (fn->slot - s);
}
static void
@ -286,14 +285,14 @@ Next:
fprintf(f, "%%%s", regtoa(ref.val, sz));
break;
case RSlot:
fprintf(f, "%d(%%rbp)", slot(ref.val, fn));
fprintf(f, "%d(%%rbp)", slot(ref, fn));
break;
case RMem:
Mem:
m = &fn->mem[ref.val];
if (rtype(m->base) == RSlot) {
off.type = CBits;
off.bits.i = slot(m->base.val, fn);
off.bits.i = slot(m->base, fn);
addcon(&m->offset, &off);
m->base = TMP(RBP);
}
@ -338,7 +337,7 @@ Next:
case RMem:
goto Mem;
case RSlot:
fprintf(f, "%d(%%rbp)", slot(ref.val, fn));
fprintf(f, "%d(%%rbp)", slot(ref, fn));
break;
case RCon:
off = fn->con[ref.val];