Due to a bug in gcc-9 (default version) packaging, it has been
configured in focal with both march & mtune set to z13.
And gcc-9 will remain configured this way in focal (20.04). At this
point we don't have enough time for a full archive rebuild with mtune
set to z15, and majority of distribution binaries will not be rebuild at
this point and are final. Meaning an update to z15 will only have impact
on security & SRU packages. Changing mtune in all focal SRUs & security
updates increases risk of any update regressing or failing to build from
source. We can SRU individual packages to build with mtune z15 if there
is significant performance improvement from doing so.
Linux Kernel & atlas are correctly built with mtune z15 in focal.
focal (20.04) will have non-default gcc-10 updated to use march z13 & mtune z15.
GG-series (20.10) will have the default gcc version updated to use march z13 &
mtune z15.
** Also affects: gcc-10 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1837525
Title:
[20.04 FEAT] Set Architecture Level (ALS) to z13
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