Infinite loop when compile spec with clang

[insuyun]

I tried to compile SPEC2006 with https://github.com/ccelio/Speckle When I compiled it, clang goes into infinite loop. Below command is that I used to compile perl in SPEC2006. Infinite loop is caused in RISCVBranchSelector.cpp

clang -S -target riscv -mriscv=RV64IAMFD -I/lib/gcc/riscv64-unknown-linux-gnu/5.2.0//include -I/lib/gcc/riscv64-unknown-linux-gnu/5.2.0//include-fixed -I/lib/gcc/riscv64-unknown-linux-gnu/5.2.0//../../../../riscv64-unknown-linux-gnu/include -I/sysroot/usr/include -static -std=gnu89 -Wl,-Ttext-segment,0x10000 -DSPEC_CPU -DNDEBUG -DPERL_CORE -fno-strict-aliasing -DSPEC_CPU_LP64 -DSPEC_CPU_LINUX_X64 -o regexec.S regexec.c -O0 

[colinschmidt]

Which branch of the repo did you use?

[insuyun]

I used RISCV.

[colinschmidt]

I think that bug was fixed on riscv-trunk and I was pretty sure I back ported it to RISCV. I'll double check that but it might be better for you to just use riscv-trunk if you don't have a reason to use an older version of llvm.

[insuyun]

I tried to use riscv-trunk. But when I compiled sample(hello.c) it gives me such error.

./install/bin/clang -target riscv -mriscv=RV64IAMFD -S hello.c -o hello.S
error: unable to create target: 'No available targets are compatible with this triple, see -version for the available targets.'

I used riscv-clang, if I put it random string as target it gives me different error

clang: warning: argument unused during compilation: '-mriscv=RV64IAMFD'
error: unknown target triple 'asdf', please use -triple or -arch

I disabled bindings but I think it is not related with this issue.

../configure --disable-bindings
make
make install

Did I do something wrong?

[colinschmidt]

I think it should be

clang -target riscv64 ...

[insuyun]

Sorry. Not working in my machine.

./install/bin/clang -target riscv64 -mriscv=RV64IAMFD -S hello.c -o hello.S
error: unable to create target: 'No available targets are compatible with this triple, see -version for the available targets.'
1 error generated.

[colinschmidt]

What does

llvm-config --targets-built

return? I usually explicitly enable riscv in the configure line like

../configure --enable-targets=riscv

[neuschaefer]

Does it work with -mriscv=RV64IMAFD instead of -mriscv=RV64IAMFD?

[insuyun]

Thanks. Hello World example can be works when I configure with --enable-targets=riscv. However, spec cannot be compiled. When I am using riscv-trunk, I got another assertion error and clang seems to go to infinite loop when compiling regexec.c.

This is the code that gets assertion error.

Instruction uses an allocated register
UNREACHABLE executed at /home/insu/projects/hdfi/src/riscv-llvm/lib/CodeGen/RegAllocFast.cpp:361!
#0 0x3d9586e llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/insu/projects/hdfi/src/riscv-llvm/lib/Support/Unix/Signals.inc:404:15
#1 0x3d968a9 PrintStackTraceSignalHandler(void*) /home/insu/projects/hdfi/src/riscv-llvm/lib/Support/Unix/Signals.inc:463:1
#2 0x3d94fc3 llvm::sys::RunSignalHandlers() /home/insu/projects/hdfi/src/riscv-llvm/lib/Support/Signals.cpp:35:5
#3 0x3d99909 SignalHandler(int) /home/insu/projects/hdfi/src/riscv-llvm/lib/Support/Unix/Signals.inc:211:1

Is there someone who successfully compile SPEC2006 with clang?