https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90055
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Known to work| |6.5.0, 8.1.0
Keywords| |needs-bisection, wrong-code
Last reconfirmed| |2019-04-12
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Summary|Incorrect result with |[7 Regression] Incorrect
|ffast-math + tree-vectorize |result with ffast-math +
| |tree-vectorize
Target Milestone|--- |7.5
Known to fail| |7.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed - this is likely a duplicate since it seems to be fixed on the GCC 8
branch and trunk. -mavx2 -mfma triggers the issue. w/o -mfma the GCC 7 branch
produces -0.0.
The GCC 8 branch doesn't vectorize the loop at t.c:104 but the basic-block at
103.
Note I observe different unrolling between 7 and 8 so the actual issue might
be latent.
Martin, can you bisect what fixed this?
