[llvm-bugs] [Bug 40296] New: Assertion failed in function processTiedPairs

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jan 11 14:59:15 PST 2019


            Bug ID: 40296
           Summary: Assertion failed in function processTiedPairs
           Product: new-bugs
           Version: 7.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: danilo at FreeBSD.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Hello, I'm getting an assertion failure building this project [1] on FreeBSD 13
using clang 7.0.1:

$ cc -Daws_checksums_EXPORTS
-I/usr/ports/devel/aws-checksums/work/aws-checksums-0.1.2/tests -O2 -pipe 
-fstack-protector -fno-strict-aliasing -O2 -pipe  -fstack-protector
-fno-strict-aliasing -fPIC   -fPIC -std=gnu99 -MD -MT
CMakeFiles/aws-checksums.dir/source/intel/crc32c_sse42_asm.c.o -MF
CMakeFiles/aws-checksums.dir/source/intel/crc32c_sse42_asm.c.o.d -o
CMakeFiles/aws-checksums.dir/source/intel/crc32c_sse42_asm.c.o   -c
Assertion failed: (i == DstIdx || !MI->getOperand(i).isReg() ||
MI->getOperand(i).getReg() != RegA), function processTiedPairs, file
/usr/src/contrib/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp, line 1544.
cc: error: unable to execute command: Abort trap (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see
FreeBSD clang version 7.0.1 (tags/RELEASE_701/final 349250) (based on LLVM

This is the file:

It seems LLVM is triggering this assert because the inline assembly is not in
SSA form. Inline assembly is not supposed to be emitted as it is?

For convenience, here is the assertion code:

Thanks in advance.


[1] - https://github.com/awslabs/aws-checksums

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