Re: 13.2-BETA2: xz: illegal instruction

From: Peter <>
Date: Fri, 24 Feb 2023 00:32:25 UTC
On Thu, Feb 23, 2023 at 10:14:13PM +0000, Jamie Landeg-Jones wrote:
! Peter <> wrote:
! >  -target-cpu westmere
! >
! > But when building with CPTYPE?=native, the code works!
! That's weird!

Ah. Hm...

! I notice the only difference between those 2 is that the "native" one
! specifically sets (-target-feature +...) or unsets (-target-feature -...)
! the features to use.
! Presumably there is something enabled by default that shouldn't be
! (for westmere), but the extra flags added with "native" fix that.

Very likely so.

! This is more a question for the clang folks, but if you're really 
! interested, you could try (on your -march=westmere build)
! disabling them in ever decreasing group sizes until you narrow
! down the culprit!

Negative. I have a whole lot more of these little nasty bugs to
pursue. Bug number is 269792

Cheerio, and kind thanks for the helping hand!