Instruction modifiers (HLSL VS reference)
Instruction modifiers affect the result of the instruction before it is written into the destination register.
Saturates (or clamps) the instruction result to [0,1] range before writing to the destination register.
add_sat dst, src0, src1
dst = clamp_between_0_and_1(src0 + src1)
The _sat instruction modifier costs no additional instruction slots.
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