12.48 __uqadd16 intrinsic

This intrinsic inserts a UQADD16 instruction into the instruction stream generated by the compiler.

It enables you to perform two unsigned 16-bit integer additions, saturating the results to the 16-bit unsigned integer range 0 ≤ x ≤ 216 - 1.

Syntax

unsigned int __uqadd16(unsigned int val1, unsigned int val2)

Where:

val1

holds the first two halfword summands

val2

holds the second two halfword summands.

Return value

The __uqadd16 intrinsic returns:

  • The addition of the low halfword in the first operand and the low halfword in the second operand.

  • The addition of the high halfword in the first operand and the high halfword in the second operand, in the high halfword of the return value.

The results are saturated to the 16-bit unsigned integer range 0 ≤ x ≤ 216 - 1.

Examples

unsigned int add_halfwords(unsigned int val1, unsigned int val2)
{
    unsigned int res;
    res = __uqadd16(val1,val2); /* res[15:0] = val1[15:0] + val2[15:0]
                                   res[31:16] = val1[31:16] + val2[31:16]
                                 */
    return res;
}
Related reference
10.147 ARMv6 SIMD intrinsics
Related information
UQADD16
ARM and Thumb instruction summary
Non-ConfidentialPDF file icon PDF versionARM DUI0472J
Copyright © 2010-2013 ARM. All rights reserved.