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Implement ABI stuff for -preview=in #3578

Merged
merged 1 commit into from
Jan 8, 2021
Merged

Implement ABI stuff for -preview=in #3578

merged 1 commit into from
Jan 8, 2021

Commits on Jan 8, 2021

  1. Implement ABI stuff for -preview=in 

    I.e., the ABI-specific decision for which parameter types to prefer
passing a ref over a value.

The x86_64 and AArch64 ABIs are pretty clear - use a ref if the POD type
cannot be passed in registers. For all others, use a simple default
heuristic based on the type size - if larger than 2 machine words, use a
ref. Note that this includes x87 `real` for the 32-bit x86 ABI.
    @kinke
    kinke committed Jan 8, 2021
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