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s = s + a(i)*b(i) on x86 requires that one stores and restores both a(i)*b(i) and s to memory after arithmetic. There is clever way of using exception trap to speed up.
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Indigenous type would specify most precise floating point representation allowed by hardware
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anonymous double would imply all intermediate results implemented using double precision (original C standard)
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anonymous indigenous would instruct compiler to use extended double precision on x86 chips for all computations -- whatever type of variable
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