Truncate (float to float)
The trunc
instructions, short for truncate, are used for getting the value of a number without its fractional part.
trunc
differs from floor
when used on negative numbers, floor
will round down in those cases while trunc
will round up.
There's another trunc
instruction that truncates the fractional part of a floating point and converts it to an integer.
Try it
Syntax
wasm
;; load a number onto the stack
f32.const 2.7
;; discard the fractional part (.7)
f32.trunc
;; the top item on the stack will now be 2
Instruction | Binary opcode |
---|---|
f32.trunc |
0x8f |
f64.trunc |
0x9d |