Hi,
chained to this message are two patches that aim to fix llvmpipe driver on
an ARM machine that has no NEON instructions. My machine is a XO-1.75
laptop with a Marvell MMP2 processor:
[lkundrak@xo ~]$ LD_SHOW_AUXV=yespls /bin/true |grep HWCAP
AT_HWCAP: half thumb fastmult vfp edsp iwmmxt thumbee vfpv3 vfpv3d16
tls idivt
AT_HWCAP2:
[lkundrak@xo ~]$
With unpatched Mesa:
# gdb /usr/libexec/Xorg --ex run
...
(II) modeset(0): Initializing kms color map for depth 24, 8 bpc.
warning: JITed object file architecture armv7 is not compatible with target
architecture iwmmxt.
...
Program received signal SIGILL, Illegal instruction.
0xb6fbe028 in ?? ()
(gdb) x/i $pc
=> 0xb6fbe028: vld1.32 {d16[]-d17[]}, [r7 :32]
(gdb)
Seems like defaulting to enabling NEON on armv7 and thus breaking on Marvell and
NVidia (and perhaps other) platform was a deliberate decision and as such is not
considered a bug by LLVM upstream: https://bugs.llvm.org/show_bug.cgi?id=30842
Lubo
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