[llvm-dev] Why x86_64 divq is not used for 128-bit by 64-bit division?

[Joshua Cranmer 🐧 via llvm-dev]

On 10/19/2017 4:58 PM, Paweł Bylica via llvm-dev wrote:
> In my example, I'm truncating the result.
>
> But anyway, are you saying that when the result of divq does not fit 
> in 64-bit the result stored in the register is undefined?

Actually, it generates a #DE exception if the result doesn't fit.

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Joshua Cranmer
Thunderbird and DXR developer
Source code archæologist