aarch64: Implement lowering i128 icmp instructions #2975
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cfallin
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Jun 9, 2021
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cranelift
We have 3 different aproaches depending on the type of comparision requested: * For eq/ne we compare the high bits and low bits and check if they are equal * For overflow checks, we perform a i128 add and check the resulting overflow flag * For the remaining comparisions (gt/lt/sgt/etc...) We compare both the low bits and high bits, and if the high bits are equal we return the result of the unsigned comparision on the low bits As with other i128 ops, we are still missing immlogic support.
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Continuing the work on i128 ops on aarch64 here is an implementation of icmp.
I did implement emitting the
sbcsinstruction even though in the end I didn't end up needing it. I decided to leave it, because I'm probably going to need it eventually