https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94123
seurer at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[10 regression] r10-7093 |[10 regression] r10-1734,
|causes |SVN r273240, causes
|gcc.target/powerpc/pr87507. |gcc.target/powerpc/pr87507.
|c to fail |c to fail
CC| |segher at gcc dot gnu.org
--- Comment #4 from seurer at gcc dot gnu.org ---
g:b18081df8cca5f2306e99709fa2c06b9cbeea8d0, r10-1734, SVN r273240
Sorry about the confusion with the reverted patch.
The current code generated for this test case is really messed up. Prior to
r10-1734 this is what was generated for gcc.target/powerpc/pr87507.c
.cfi_startproc
cmpdi 0,3,0
beqlr 0
std 5,0(4)
std 6,8(4)
std 5,16(4)
std 6,24(4)
blr
Starting with r10-1734 (and still today) this is what is generated:
.cfi_startproc
cmpdi 0,3,0
beqlr 0
std 30,-16(1)
std 31,-8(1)
.cfi_offset 30, -16
.cfi_offset 31, -8
mr 30,6
mr 31,5
addi 9,4,16
mr 10,30
mr 11,31
std 31,0(4)
std 30,8(4)
std 11,0(9)
std 10,8(9)
ld 30,-16(1)
ld 31,-8(1)
.cfi_restore 31
.cfi_restore 30
blr
All sorts of extra moves, loads, and stores.
Options used: -O2 -mdejagnu-cpu=power8
