https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63175
Bug ID: 63175
Summary: [4.9/5 regression] FAIL:
gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c
scan-tree-dump-times slp2" basic block vectorized
using SLP" 1
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: regression
Assignee: unassigned at gcc dot gnu.org
Reporter: ma...@linux-mips.org
Host: i686-linux-gnu
Target: powerpc-linux-gnu
I see this failure in Power/Linux testing with 4.9.1 and also trunk
(5.0), so presumably the regression happened sometime between 4.8 and
4.9:
FAIL: gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c scan-tree-dump-times
slp2" basic block vectorized using SLP" 1
This test passed with 4.8. This is with powerpc-linux-gnu.
Looking at the generated assembly the quality of code has indeed
regressed, copying between `pin' and `pout' in `main1' is no longer
optimised away.
This happens for AltiVec multilibs only, seen with:
-mcpu=603e
-mcpu=603e -msoft-float
-mcpu=7400 -maltivec -mabi=altivec
-mcpu=e6500 -maltivec -mabi=altivec
-mcpu=e6500 -m64 -maltivec -mabi=altivec
option selections here.
Options used to configure the compiler:
--build=i686-pc-linux-gnu
--target=powerpc-linux-gnu
--with-cpu-32=603e
--with-cpu-64=e5500
--with-long-double-128
