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Home > ARMv6 SIMD Instruction Intrinsics > __shadd8 intrinsic |
This intrinsic inserts a SHADD8
instruction into the instruction stream generated by the compiler.
It enables you to perform four signed 8-bit integer additions, halving the results.
unsigned int __shadd8(unsigned int
val1
, unsigned int val2
)
Where:
val1
holds the first four 8-bit summands
val2
holds the second four 8-bit summands.
The __shadd8
intrinsic returns:
The halved addition of the first bytes from each operand, in the first byte of the return value.
The halved addition of the second bytes from each operand, in the second byte of the return value.
The halved addition of the third bytes from each operand, in the third byte of the return value.
The halved addition of the fourth bytes from each operand, in the fourth byte of the return value.
unsigned int add_and_halve(unsigned int val1, unsigned int val2) { unsigned int res; res = __shadd8(val1,val2); /* res[7:0] = (val1[7:0] + val2[7:0]) >> 1 res[15:8] = (val1[15:8] + val2[15:8]) >> 1 res[23:16] = (val1[23:16] + val2[23:16]) >> 1 res[31:24] = (val1[31:24] + val2[31:24]) >> 1 */ return res; }