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[v3] libstdc++/52699


Hi,

this is what I'm going to commit to mainline (and likely 4.7.1 too) to solve a number of issues affecting the implementation of independent_bits_engine::operator()() as originally contributed: essentially we want to be very careful with overflows (+ other lesser issues and small optimizations). Many thanks to Marc Glisse for off-line reviewing and helping over the last day or so!!

Tested x86_64-linux multilib.

Paolo.

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Attachment: CL_52699
Description: Text document

Attachment: patch_52699
Description: Text document


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