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Turns out hardware enforces SP 16-bit alignment in every SP relative
load/store, but QEMU doesn't emulate this.
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- Missing: vaargs, >2 member HFAs
- Reworked the way stack allocation references are lowered. Now RSTACK
persists throughout all passes until emit. This allows deferring stack
frame layouting until the end in a less messy way than before, which
was emiting frame-pointer relative addresses @ isel time and patching them up
later in emit to account for actual stack frame layout.
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Is much nicer. I don't know whether I want to do it for the other int
types too. char and uchar are fine as bytes. u/short -> u/s16int, maybe.
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The motivation is for aarch64 msub/madd instrs, for isel to produce. But
it should be useful for other things too.
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Looks nicer
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