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On 11/18/2016 1:11 PM, Joseph Myers wrote:
On Fri, 18 Nov 2016, Chris Metcalf wrote:We clearly should also tell libgcc not to bother preserving nan payloads given that the hardware doesn't do it in any case; I'll pass that along to the compiler team, but I'll also commit my original patch since it seems to match the hardware behavior.FWIW, I wouldn't expect any significant performance difference between copying a payload and setting a payload to the canonical one (which is what you get if !_FP_KEEPNANFRACP).
My assumption was that we should tweak it for consistency, not for performance. Is your sense that we might as well keep the NaN payloads in libgcc even if we don't with inline float operations? -- Chris Metcalf, Mellanox Technologies http://www.mellanox.com
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