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