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There is no question that if the sort in unstable, we could end up coalescing pairs in different orders, which could then affect the code generated. Does this currently affect your bootstrap?
Do you have an actual bug or bootstrap failure, or is this meant as a
preventative measure? My opinion would be that if we can demonstrate
it affects bootstrap then its a regression. Otherwise, any bugs
uncovered are just that, legitimate bugs that need to be fixed and we
should fix those rather than cover them up and slow down the sort.
I'm open for convincing otherwise, but this code has been in there since SSA went in for 4.0 I think, and since 4.1 for sure. No problem has been previously reported.
Cheers Nick
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