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Commit ef4915f
doc: fix Fast FFI argument count in ffi.md
The text said functions with more than 7 arguments fall back to the
generic call path, contradicting the preceding sentence that Fast FFI
calls support up to 8 arguments.
The real limit is architecture- and type-dependent: the hard cap is 8
public arguments (src/ffi/fast.cc), but register pressure lowers the
effective count to 7 integer/pointer arguments on AArch64 and 6 on
x86-64, while floating-point arguments can use up to 8 on both. Describe
this instead of the previous, inaccurate single threshold.
Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
PR-URL: #63960
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>1 parent 518309c commit ef4915f
1 file changed
Lines changed: 7 additions & 2 deletions
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