<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/58699>58699</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Fail to translate the llvm ir to Nvidia PTX code if there exist a 256-bits function parameter.
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
Kenun99
</td>
</tr>
</table>
<pre>
The PTX backend will raise an error when handing the below IR. `$ llc ./example.ll -o exe`
Toolchain: pre-compiled releases from Github, clang+llvm-15.0.2-x86_64-unknown-linux-gnu-rhel86.tar.xz
I believe that it is a PTX backend issue because the x86 backend can translate it well, i.e., change the target triple to the default value.
```
target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64"
target triple = "nvptx64-nvidia-cuda"
define i256 @foo(i256* nocapture readonly byval(i256) align 8 %0) {
%2 = load i256, i256* %0, align 8
%3 = add i256 %2, 1
ret i256 %3
}
```
Crash dump:
```
weimin@ubuntu:~$ ./clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/bugpoint -run-llc t.ll
Read input file : 't.ll'
*** All input ok
Initializing execution environment: Found llc: /home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc
Running the code generator to test for a crash: <llc>
Error running tool:
/home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc -o bugpoint-test-program-e18d53e.bc-a6c01de.llc.s bugpoint-test-program-e18d53e.bc
free(): invalid pointer
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: /home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc -o bugpoint-test-program-e18d53e.bc-a6c01de.llc.s bugpoint-test-program-e18d53e.bc
1. Running pass 'Function Pass Manager' on module 'bugpoint-test-program-e18d53e.bc'.
2. Running pass 'NVPTX DAG->DAG Pattern Instruction Selection' on function '@foo'
#0 0x0000562b44cf52c3 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc+0x266d2c3)
#1 0x0000562b44cf31be llvm::sys::RunSignalHandlers() (/home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc+0x266b1be)
#2 0x0000562b44cf565f SignalHandler(int) Signals.cpp:0:0
#3 0x00007f113ca94980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
#4 0x00007f113b6e3e87 raise /build/glibc-CVJwZb/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f113b6e57f1 abort /build/glibc-CVJwZb/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f113b72e837 __libc_message /build/glibc-CVJwZb/glibc-2.27/libio/../sysdeps/posix/libc_fatal.c:181:0
#7 0x00007f113b7358ba /build/glibc-CVJwZb/glibc-2.27/malloc/malloc.c:5342:0
#8 0x00007f113b73cdec _int_free /build/glibc-CVJwZb/glibc-2.27/malloc/malloc.c:4167:0
#9 0x00007f113b73cdec free /build/glibc-CVJwZb/glibc-2.27/malloc/malloc.c:3134:0
#10 0x0000562b43890d39 llvm::NVPTXTargetLowering::LowerReturn(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, llvm::SmallVectorImpl<llvm::SDValue> const&, llvm::SDLoc const&, llvm::SelectionDAG&) const (/home/weimin/clang+llvm-15.0.2-x86_64-unknown-linux-gnu/bin/llc+0x1208d39)
#11 0x0000562b49015ab8
*** Debugging code generator crash!
*** Attempting to reduce the number of function attributes in the testcase
Checking for crash with changing conditionals to always jump to true: : <llc><crash>
Emitted bitcode to 'bugpoint-reduced-conditionals.bc'
Checking for crash with only these blocks: : <llc><crash>
Emitted bitcode to 'bugpoint-reduced-blocks.bc'
Checking for crash with CFG simplifying: : <llc><crash>
Emitted bitcode to 'bugpoint-reduced-simplifycfg.bc'
Checking for crash with only 2 instructions: <llc><crash>
Checking for crash with only 1 instruction: <llc><crash>
*** Attempting to reduce testcase by deleting instructions: Simplification Level #1
Checking instruction: %2 = add i256 undef, 1<llc><crash>
*** Attempting to reduce testcase by deleting instructions: Simplification Level #0
Checking for crash with metadata retained from 1 instruction: <llc><crash>
Emitted bitcode to 'bugpoint-reduced-instructions.bc'
*** Attempting to strip the debug info: <llc><crash>
*** Attempting to strip the debug type info: <llc><crash>
*** Attempting to remove named metadata: Emitted bitcode to 'bugpoint-reduced-named-md.bc'
*** Attempting to perform final cleanups: <llc>
Emitted bitcode to `'bugpoint-reduced-simplified.bc'`
```
Download the bugpoint-reduced-simplified.bc from the below link.
https://drive.google.com/file/d/17dJmObV5RGIcWIESO0V65VeVIltmiK1l/view?usp=sharing
</pre>
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