12.60 __uxtab16 intrinsic

This intrinsic inserts a UXTAB16 instruction into the instruction stream generated by the compiler.

It enables you to extract two 8-bit values from one operand, zero-extend them to 16 bits each, and add the results to two 16-bit values from another operand.


unsigned int __uxtab16(unsigned int val1, unsigned int val2)
Where val2[7:0] and val2[23:16] hold the two 8-bit values to be zero-extended.

Return value

The __uxtab16 intrinsic returns the 8-bit values in val2, zero-extended to 16-bit values and added to val1.


unsigned int extend_add(unsigned int val1, unsigned int val2)
    unsigned int res;
    res = __uxtab16(val1,val2); /* res[15:0] = ZeroExt(val2[7:0] to 16 bits) 
                                     + val1[15:0]
                                   res[31:16] = ZeroExt(val2[31:16] to 16 bits)
                                     + val1[31:16]
    return res;
Related reference
9.144 ARMv6 SIMD intrinsics
Related information
ARM and Thumb instruction summary
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