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math/big: use more efficient way to save/restore CF flag #9243

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griesemer opened this issue Dec 10, 2014 · 0 comments
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math/big: use more efficient way to save/restore CF flag #9243

griesemer opened this issue Dec 10, 2014 · 0 comments
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@griesemer
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From personal e-mail with Torbjörn Granlund:

"About saving/restoring the CF flag:

RCRQ/RCLQ are really slow on some archs, and slow on other. It is
better to use common insns like SBB Rx,Rx for saving and ADD Rx,Rx
for restoring."
@griesemer griesemer self-assigned this Dec 10, 2014
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@ianlancetaylor @griesemer @gopherbot