i32.load16_s
Takes 16 bits (2 bytes) of memory from the given location and pushes it onto the stack as an i32 value. This looks at the value as a signed integer (can be negative). If the 16 bit number in memory is a negative value, then all the highter bits of the i32 number are set to 1, making it a negative number too.

Syntax

i32.load16_s offset=n align=n

Parameters

offset Optional
A numeric value that gives an extra offset to the memory location given. Must be a positive value. Can be written as a decimal number or using the 0x00 hexadecimal notation. If the memory location is 8 and you add an extra offset of 2, then the final memory location is 10. This is useful if you are using a data structure with fields at different locations inside.
align Optional
Gives information to the machine running the application about the alignment that could be used when setting the location of the memory. This can only be 0, 1, 2, or 4. You will not see any difference and it may not even be used. It is more of a hint than a command.

Stack In

i32 Memory offset location to get the data from.

Stack Out

i32 The data copied from memory.

Examples

;; Memory is [ 0x81, 0x92, 0xA3, 0xB4, 0xC5, 0xD6, 0xE7, 0xF8 ]

;; Push the i32 memory offset value location onto the stack
i32.const 2

;; Pop the memory location off the stack, get the memory
;; at the given location, and push the value onto the stack
i32.load16_s

;; The stack contains an i32 value of (0xB4A3 = 46243) = 0x0000B4A3

;; Memory is [ 0x81, 0x92, 0xA3, 0xB4, 0xC5, 0xD6, 0xE7, 0xF8 ]

;; Push the i32 memory offset value location onto the stack
i32.const 6

;; Pop the memory location off the stack, get the memory
;; at the given location, and push the value onto the stack
i32.load16_s

;; The stack contains an i32 value of (0xF8E7 = -1817) = 0xFFFFF8E7

;; Memory is [ 0x81, 0x92, 0xA3, 0xB4, 0xC5, 0xD6, 0xE7, 0xF8 ]

;; Push the i32 memory offset value location onto the stack
i32.const 2

;; Pop the memory location off the stack, get the memory
;; at the given location, and push the value onto the stack
i32.load16_s offset=2

;; The stack contains an i32 value of (0xD6C5 = -10555) = 0xFFFFD6C5