[llvm-dev] [AMDGPU] AMDGPUAsmParser fails to parse several instructions

Fri Oct 23 05:20:06 PDT 2015

Dear Developers,

I found out the information included in the last mail is incorrect. Sorry
for misleading stack dump information. That information is generated when
AMDGPUAsmParser parsing the following assembly:

v_mad_f32 v9, 0.5, v5, -v8

llvm-mc:
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:184:
void (anonymous namespace)::AMDGPUOperand::setModifiers(unsigned int):
Assertion `isReg()' failed.
#0 0x6608ee llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Support/Unix/Signals.inc:404:15
#1 0x661a29 PrintStackTraceSignalHandler(void*)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Support/Unix/Signals.inc:463:1
#2 0x660463 llvm::sys::RunSignalHandlers()
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Support/Signals.cpp:35:5
#3 0x661c84 SignalHandler(int)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Support/Unix/Signals.inc:211:1
#4 0x7fb282371d60 __restore_rt (/usr/lib/libpthread.so.0+0x10d60)
#5 0x7fb2815445f8 __GI_raise (/usr/lib/libc.so.6+0x335f8)
#6 0x7fb281545a7a __GI_abort (/usr/lib/libc.so.6+0x34a7a)
#7 0x7fb28153d417 __assert_fail_base (/usr/lib/libc.so.6+0x2c417)
#8 0x7fb28153d4c2 (/usr/lib/libc.so.6+0x2c4c2)
#9 0x4711ee (anonymous namespace)::AMDGPUOperand::setModifiers(unsigned
int)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:185:21
#10 0x46ff6a (anonymous
namespace)::AMDGPUAsmParser::parseOperand(llvm::SmallVectorImpl<std::unique_ptr<llvm::MCParsedAsmOperand,
std::default_delete<llvm::MCParsedAsmOperand> > >&, llvm::StringRef)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:1040:16
#11 0x46cd46 (anonymous
namespace)::AMDGPUAsmParser::ParseInstruction(llvm::ParseInstructionInfo&,
llvm::StringRef, llvm::SMLoc,
llvm::SmallVectorImpl<std::unique_ptr<llvm::MCParsedAsmOperand,
std::default_delete<llvm::MCParsedAsmOperand> > >&)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:1085:43
#12 0x5ae9a7 (anonymous namespace)::AsmParser::parseStatement((anonymous
namespace)::ParseStatementInfo&, llvm::MCAsmParserSemaCallback*)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/MC/MCParser/AsmParser.cpp:1620:8
#13 0x5a4d76 (anonymous namespace)::AsmParser::Run(bool, bool)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/MC/MCParser/AsmParser.cpp:654:9
#14 0x41274c AssembleInput(char const*, llvm::Target const*,
llvm::SourceMgr&, llvm::MCContext&, llvm::MCStreamer&, llvm::MCAsmInfo&,
llvm::MCSubtargetInfo&, llvm::MCInstrInfo&, llvm::MCTargetOptions&)
/mnt/dm-0/codebase/Compilers/LLVM/llvm/tools/llvm-mc/llvm-mc.cpp:363:13
#15 0x41165a main
/mnt/dm-0/codebase/Compilers/LLVM/llvm/tools/llvm-mc/llvm-mc.cpp:527:9
#16 0x7fb281531610 __libc_start_main (/usr/lib/libc.so.6+0x20610)
#17 0x410009 _start (/usr/local/bin/llvm-mc+0x410009)
Stack dump:
0. Program arguments: llvm-mc -arch=amdgcn -mcpu=SI sop1-playground.s
zsh: abort (core dumped)  llvm-mc -arch=amdgcn -mcpu=SI sop1-playground.s

When the assembly code is s_mov_b32 s0, 0xfe5163ab, the error message is
the following (and the program terminates without the assertion failed)

sop1-playground.s:1:15: error: invalid immediate: only 32-bit values are
legal
s_mov_b32 s0, 0xfe5163ab
                       ^
sop1-playground.s:1:25: error: failed parsing operand.
s_mov_b32 s0, 0xfe5163ab
                                       ^

Regards,

李弘宇 (Li, Hong-Yu)
Department of Computer Science & Information Engineering
National Taiwan University

On Fri, Oct 23, 2015 at 3:36 PM, 李弘宇 <zhenlinospirit at gmail.com> wrote:

> Dear Developers,
>
> I compile a OpenCL kernel, FFT, in AMDAPP SDK v2.5 using clang 3.8 +
> libclc and assembling the code with lld (The LLVM linker). The assembly
> code contains the following assembly codes (and lots of other similar
> format assembly) that fails to be parsed by AMDGPUAsmParser. It seems to me
> that both are valid instructions after looking at the SI instruction spec.
>
> s_mov_b32 s0, 0xfe5163ab
> v_mad_f32 v9, 0.5, v5, -v8
>
> To reproduce this, I write this two lines in a text file and run
>
> llvm-mc -arch=amdgcn -mcpu=kaveri input.s
>
> The first line has the following error message:
>
> sop1-playground.s:1:15: error: invalid immediate: only 32-bit values are
> legal
> s_mov_b32 s0, 0xfe5163ab
>                          ^
> sop1-playground.s:1:25: error: failed parsing operand.
> s_mov_b32 s0, 0xfe5163ab
>                                             ^
> The part of stack dump:
>
> ...
> #9 0x4711ee (anonymous namespace)::AMDGPUOperand::setModifiers(unsigned
> int)
> /mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:185:21
> #10 0x46ff6a (anonymous
> namespace)::AMDGPUAsmParser::parseOperand(llvm::SmallVectorImpl<std::unique_ptr<llvm::MCParsedAsmOperand,
> std::default_delete<llvm::MCParsedAsmOperand> > >&, llvm::StringRef)
> /mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:1040:16
> #11 0x46cd46 (anonymous
> namespace)::AMDGPUAsmParser::ParseInstruction(llvm::ParseInstructionInfo&,
> llvm::StringRef, llvm::SMLoc,
> llvm::SmallVectorImpl<std::unique_ptr<llvm::MCParsedAsmOperand,
> std::default_delete<llvm::MCParsedAsmOperand> > >&)
> /mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:1085:43
> ...
>
> The second line of the assembly has the assertion fail:
>
> llvm-mc:
> /mnt/dm-0/codebase/Compilers/LLVM/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:184:
> void (anonymous namespace)::AMDGPUOperand::setModifiers(unsigned int):
> Assertion `isReg()' failed.
>
> and reports that 0.5 is "error: invalid operand for instruction"
>
> v_mad_f32 v9, 0.5, v5, -v8
>                          ^
>
> Regards,
>
> 李弘宇 (Li, Hong-Yu)
> Department of Computer Science & Information Engineering
> National Taiwan University
>
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