From ae5480dda71f4d4c386a9746d26eb143c342b7a4 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Tue, 6 Jun 2017 19:00:58 +0000
Subject: 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
---
 test/CodeGen/MIR/X86/inline-asm.mir | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 test/CodeGen/MIR/X86/inline-asm.mir

(limited to 'test/CodeGen/MIR')

diff --git a/test/CodeGen/MIR/X86/inline-asm.mir b/test/CodeGen/MIR/X86/inline-asm.mir
new file mode 100644
index 00000000000..be96517144b
--- /dev/null
+++ b/test/CodeGen/MIR/X86/inline-asm.mir
@@ -0,0 +1,12 @@
+# 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
-- 
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