[OpenRISC] Fwd: Instruction selection failed when compiling SPEC 2006

[Ziqiang Patrick Huang]

Hi,

I'm trying to use llvm-or1k to compile SPEC 2006, I'm getting the following
errors when compiling some of the benchmarks:


LLVM ERROR: Cannot select: 0x5a96d80: f32 = fabs 0x5a95498 [ORD=48]
[ID=122]
LLVM ERROR: Cannot select: 0x39443f0: f32 = bitcast 0x38ffca8 [ORD=43]
[ID=488]
LLVM ERROR: Cannot select: 0x5f13298: f32 = fneg 0x5f2e6d0 [ORD=2] [ID=8]

It seems like the ISA does not support a bunch of floating point
instructions. Any help ?

Thanks,
Ziqiang

[Ziqiang Patrick Huang]

Hi,

I'm trying to use llvm-or1k to compile SPEC 2006, I'm getting the following
errors when compiling some of the benchmarks:


LLVM ERROR: Cannot select: 0x5a96d80: f32 = fabs 0x5a95498 [ORD=48]
[ID=122]
LLVM ERROR: Cannot select: 0x39443f0: f32 = bitcast 0x38ffca8 [ORD=43]
[ID=488]
LLVM ERROR: Cannot select: 0x5f13298: f32 = fneg 0x5f2e6d0 [ORD=2] [ID=8]

It seems like the ISA does not support a bunch of floating point
instructions ... Is anyone working on this ?

Also what benchmarks have been successfully compiled so far using llvm-or1k
?

Thanks,
Ziqiang

[BAndViG]

I checked the OpenRISC architecture spec. v.1.1 and it looks like OpenRISC ISA doesn’t include such instructions. So they have to be implemented somewhere in LLVM by appropriate routines.
Personally, I’m working on FPU32 port now but I use GCC/NewLIB tool chain for SoftFloat (as testing tool), Whetstone (as FPU benchmark) and Coremark (as integer pipeline benchmark).
I made some (really not significant) modifications to port these tools under GCC/NewLIB, but I haven’t shared the source yet. If you are interested in source code of the tools I’m ready to e-mail them to you (the several KB in zip).
BR
Andrey

From: Ziqiang Patrick Huang
Sent: Friday, January 09, 2015 5:44 PM
To: ***@lists.opencores.org ; ***@lists.openrisc.net
Subject: [OpenRISC] Instruction selection failed when compiling SPEC 2006

Hi,

I'm trying to use llvm-or1k to compile SPEC 2006, I'm getting the following errors when compiling some of the benchmarks:


LLVM ERROR: Cannot select: 0x5a96d80: f32 = fabs 0x5a95498 [ORD=48] [ID=122]
LLVM ERROR: Cannot select: 0x39443f0: f32 = bitcast 0x38ffca8 [ORD=43] [ID=488]
LLVM ERROR: Cannot select: 0x5f13298: f32 = fneg 0x5f2e6d0 [ORD=2] [ID=8]


It seems like the ISA does not support a bunch of floating point instructions ... Is anyone working on this ?

Also what benchmarks have been successfully compiled so far using llvm-or1k ?

Thanks,
Ziqiang


--------------------------------------------------------------------------------

[Ziqiang Patrick Huang]

Hi Andrey,

Thanks so much for your reply. Yes, the ISA definitely does not support
these instructions, I guess I will have to modify some code to make
instruction selector to pattern match the existing instructions, and I
think the modification should be on the or1k backend side. It would be
great if you can send me your modifications because I think I might need to
modify some of the toolchains too. Right now when I try to compile
SPEC2006, none of them pass the linking stages. I'm getting a lot of
"undefined reference to ..." error, for example, "stderr" which should be
in libc, but turns out not. I wonder if you have encountered similar
situations.

I really appreciate your help.
Patrick

Post by BAndViG
I checked the OpenRISC architecture spec. v.1.1 and it looks like
OpenRISC ISA doesn’t include such instructions. So they have to be
implemented somewhere in LLVM by appropriate routines.
Personally, I’m working on FPU32 port now but I use GCC/NewLIB tool chain
for SoftFloat (as testing tool), Whetstone (as FPU benchmark) and Coremark
(as integer pipeline benchmark).
I made some (really not significant) modifications to port these tools
under GCC/NewLIB, but I haven’t shared the source yet. If you are
interested in source code of the tools I’m ready to e-mail them to you (the
several KB in zip).
BR
Andrey
*Sent:* Friday, January 09, 2015 5:44 PM
*Subject:* [OpenRISC] Instruction selection failed when compiling SPEC
2006
Hi,
I'm trying to use llvm-or1k to compile SPEC 2006, I'm getting the
LLVM ERROR: Cannot select: 0x5a96d80: f32 = fabs 0x5a95498 [ORD=48] [ID=122]
LLVM ERROR: Cannot select: 0x39443f0: f32 = bitcast 0x38ffca8 [ORD=43] [ID=488]
LLVM ERROR: Cannot select: 0x5f13298: f32 = fneg 0x5f2e6d0 [ORD=2] [ID=8]
It seems like the ISA does not support a bunch of floating point
instructions ... Is anyone working on this ?
Also what benchmarks have been successfully compiled so far using llvm-or1k ?
Thanks,
Ziqiang
------------------------------
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