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implement float -> unsigned casts

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amd64 lacks instruction for this so it has to be implemented with
float -> signed casts. The approach is borrowed from llvm.
This commit is contained in:
Bor Grošelj Simić 2022-01-28 02:06:18 +01:00 • committed by Quentin Carbonneaux
parent 74d022f975
commit 3964574a83
6 changed files with 93 additions and 6 deletions
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26
amd64/isel.c
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@ -307,6 +307,32 @@ sel(Ins i, ANum *an, Fn *fn)
emit(Oand, Kl, tmp[0], i.arg[0], getcon(1, fn));
fixarg(&curi->arg[0], Kl, curi, fn);
break;
case Ostoui:
i.op = Ostosi;
r0 = newtmp("ftou", Ks, fn);
goto Oftoui;
case Odtoui:
i.op = Odtosi;
r0 = newtmp("ftou", Kd, fn);
Oftoui:
if (k == Kw) {
goto Emit;
}
for (j=0; j<4; j++)
tmp[j] = newtmp("ftou", Kl, fn);
emit(Oor, Kl, i.to, tmp[0], tmp[3]);
emit(Oand, Kl, tmp[3], tmp[2], tmp[1]);
emit(i.op, Kl, tmp[2], r0, R);
if (i.op == Ostosi)
emit(Oadd, Ks, r0, getcon(0xdf000000, fn), i.arg[0]);
else
emit(Oadd, Kd, r0, getcon(0xc3e0000000000000, fn), i.arg[0]);
i1 = curi;
fixarg(&i1->arg[0], i.op == Ostosi ? Ks : Kd, i1, fn);
fixarg(&i1->arg[1], i.op == Ostosi ? Ks : Kd, i1, fn);
emit(Osar, Kl, tmp[1], tmp[0], getcon(63, fn));
emit(i.op, Kl, tmp[0], i.arg[0], R);
fixarg(&curi->arg[0], Kl, curi, fn);
case Onop:
break;
case Ostored: