index.md

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title: Promote
slug: WebAssembly/Reference/Numeric/Promote

---

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The promote instruction, is used to convert (promote) numbers of type f32 to type f64.

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Syntax

;; push an f32 onto the stack
f32.const 10.5

;; promote from f32 to f64
f64.promote_f32

;; the top item on the stack will now be the value 10.5 of type f64

Instruction	Binary opcode
f64.promote_f32	0xbb