pan/bi: Don't assign slots for the blend second source
Another instruction might write to the second source, and then an
INSTR_INVALID_ENC fault will be raised because the tuple will write to
and read from the register at the same time.
Fixes: 795638767d
("pan/bi: Use fused dual source blending")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15250>
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@ -120,6 +120,12 @@ bi_assign_slots(bi_tuple *now, bi_tuple *prev)
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if (now->add) {
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bi_foreach_src(now->add, src) {
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/* This is not a real source, we shouldn't assign a
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* slot for it.
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*/
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if (now->add->op == BI_OPCODE_BLEND && src == 4)
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continue;
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if (!(src == 0 && read_dreg))
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bi_assign_slot_read(&now->regs, (now->add)->src[src]);
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}
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