The FPU uses 80 bits

That's true of the old 8087 FPUs (and later on-chip compatible units), but (almost*) no compiler more than say 7 or 8 years old still uses the old 80-bit fpr0 .. fpr8 registers and associated instructions.

My cpu is ~10 years old, and it has MMX (only uses the lower 64-bits of the 87-style registers. ) and SSE, SSE2, SSE3, SSSE3, which use the lower 64-bits of the 128-bit xmmm register set.

(*The D compiler provides a 80-bit fp native type.)

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In reply to Re^2: Determining the minimum representable increment/decrement possible? by BrowserUk
in thread Determining the minimum representable increment/decrement possible? by BrowserUk

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