https://llvm.org/bugs/show_bug.cgi?id=28524
Bug ID: 28524
Summary: Assertion failed: (Bits != 0 && "Cannot print this
instruction.") for patchable functions
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: i...@azulsystems.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16731
--> https://llvm.org/bugs/attachment.cgi?id=16731&action=edit
test case
$ llvm/buildDA/bin/llc -O3 test.ll
Assertion failed: (Bits != 0 && "Cannot print this instruction."), function
printInstruction, file llvm/buildDA/lib/Target/X86/X86GenAsmWriter.inc, line
46606.
Stack dump:
0. Program arguments: llvm/buildDA/bin/llc -O3 tmp.ll
1. Running pass 'Function Pass Manager' on module 'tmp.ll'.
2. Running pass 'X86 Assembly / Object Emitter' on function '@test'
Problem happens when we are trying to print "PATCHABLE_OP 2, KILL, <ops...>"
"X86AsmPrinter::LowerPATCHABLE_OP" can't handle target independent opcodes.
Problematic instruction is generated from PatchableFunction.cpp. It looks for
the first instruction which in this case turns out to be KILL. I suspect that
http://reviews.llvm.org/rL274952 is indirectly responsible for such behaviour.
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