clean the commutativity + fix bug in emit
The commutativity information only makes sense for arithmetic expressions. To account for that, I introduced a new tri-valued boolean type B3. Memory operations, for example, will receive an undefined commutativity trit. The code emitter was buggy when rega emitted instructions like 'rax = add 1, rax', this is now fixed using the commutativity information (we rewrite it in 'rax = add rax, 1').
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5 changed files with 28 additions and 16 deletions
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@ -355,7 +355,7 @@ spill(Fn *fn)
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w = (Bits){{0}};
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if (rtype(i->arg[1]) == RSym
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&& !req(i->to, R)
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&& !opdesc[i->op].commut) {
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&& opdesc[i->op].comm == F) {
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/* <arch>
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* here we make sure that we
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* will never have to compile
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