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Matthias Braun ae5480dda7 MIRPrinter: Avoid assert() when printing empty INLINEASM strings.

CodeGen uses MO_ExternalSymbol to represent the inline assembly strings.
Empty strings for symbol names appear to be invalid. For now just
special case the output code to avoid hitting an `assert()` in
`printLLVMNameWithoutPrefix()`.

This fixes https://llvm.org/PR33317

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304815 91177308-0d34-0410-b5e6-96231b3b80d8

2017-06-06 19:00:58 +00:00

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 # RUN: llc -o - %s -mtriple=x86_64-- -run-pass none | FileCheck %s
 ---
 # Avoid crash/assert when using an emptystring in an INLINEASM.
 # CHECK-LABEL: name: emptystring
 # CHECK: bb.0:
 # CHECK:   INLINEASM $"", 1
 # CHECK:   RET 0
 name: emptystring
 body: |
   bb.0:
     INLINEASM $"", 1
     RET 0