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sunfishcode avatar sunfishcode commented on August 31, 2024

The C trunc function rounds to nearest with ties toward zero. The wasm trunc instruction rounds towards zero. The wasm nearest instructions round to nearest with ties to even. So while it's possible there's an optimized sequence which computes the C trunc function in wasm, it would need to be more than a single instruction.

Unless something is overlooked, all C functions which can be mapped to a single wasm function are mapped. Clang also performs this optimization inline.

from wasi-libc.

sunfishcode avatar sunfishcode commented on August 31, 2024

Oops, I mixed up a few different things there. trunc is already mapped; we don't use the musl version, but use this version instead.

from wasi-libc.

sunfishcode avatar sunfishcode commented on August 31, 2024

Consequently, this is fixed!

from wasi-libc.

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