12.49 __uqadd8 intrinsic

This intrinsic inserts a UQADD8 instruction into the instruction stream generated by the compiler.

It enables you to perform four unsigned 8-bit integer additions, saturating the results to the 8-bit unsigned integer range 0 ≤ x ≤ 28 - 1.

Syntax

unsigned int __uqadd8(unsigned int val1, unsigned int val2)
Where:
val1
holds the first four 8-bit summands
val2
holds the second four 8-bit summands.

Return value

The __uqadd8 intrinsic returns:
  • The addition of the first bytes in each operand, in the first byte of the return value.
  • The addition of the second bytes in each operand, in the second byte of the return value.
  • The addition of the third bytes in each operand, in the third byte of the return value.
  • The addition of the fourth bytes in each operand, in the fourth byte of the return value.
The results are saturated to the 8-bit unsigned integer range 0 ≤ x ≤ 28 - 1.

Examples

unsigned int add_bytes(unsigned int val1, unsigned int val2)
{
    unsigned int res;
    res = __uqadd8(val1,val2); /* res[7:0] = val1[7:0] + val2[7:0]
                                  res[15:8] = val1[15:8] + val2[15:8]
                                  res[23:16] = val1[23:16] + val2[23:16]
                                  res[31:24] = val1[31:24] + val2[31:24]
                                */
    return res;
}
Related reference
9.143 ARMv6 SIMD intrinsics
Related information
UQADD8
ARM and Thumb instruction summary
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