From 2791dcca605496da8b56fa1d625f165fc9cdc7e8 Mon Sep 17 00:00:00 2001
From: Alex Lorenz <arphaman@gmail.com>
Date: Wed, 12 Aug 2015 21:27:16 +0000
Subject: [PATCH] MIR Parser: Allow the MI IR references to reference global
 values.

This commit fixes a bug where MI parser couldn't resolve the named IR
references that referenced named global values.

llvm-svn: 244817
---
 llvm/lib/CodeGen/MIRParser/MIParser.cpp       |  3 +++
 llvm/test/CodeGen/MIR/X86/memory-operands.mir | 21 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index b6c393994717..b333f0b52b1b 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -1085,6 +1085,9 @@ bool MIParser::parseIRValue(Value *&V) {
   switch (Token.kind()) {
   case MIToken::NamedIRValue: {
     V = MF.getFunction()->getValueSymbolTable().lookup(Token.stringValue());
+    if (!V)
+      V = MF.getFunction()->getParent()->getValueSymbolTable().lookup(
+          Token.stringValue());
     if (!V)
       return error(Twine("use of undefined IR value '") + Token.range() + "'");
     break;
diff --git a/llvm/test/CodeGen/MIR/X86/memory-operands.mir b/llvm/test/CodeGen/MIR/X86/memory-operands.mir
index 002d147b3547..1bde368f5767 100644
--- a/llvm/test/CodeGen/MIR/X86/memory-operands.mir
+++ b/llvm/test/CodeGen/MIR/X86/memory-operands.mir
@@ -84,6 +84,13 @@
     ret i32 %b
   }
 
+  define i32 @global_value() {
+  entry:
+    %a = load i32, i32* @G
+    %b = add i32 %a, 1
+    ret i32 %b
+  }
+
   define i32 @jumptable_psv(i32 %in) {
   entry:
     switch i32 %in, label %def [
@@ -290,6 +297,20 @@ body:
       - 'RETQ %eax'
 ...
 ---
+name:            global_value
+tracksRegLiveness: true
+body:
+  - id:          0
+    name:        entry
+    instructions:
+      - '%rax = MOV64rm %rip, 1, _, @G, _'
+# CHECK: name: global_value
+# CHECK: %eax = MOV32rm killed %rax, 1, _, 0, _ :: (load 4 from %ir.G)
+      - '%eax = MOV32rm killed %rax, 1, _, 0, _ :: (load 4 from %ir.G)'
+      - '%eax = INC32r killed %eax, implicit-def dead %eflags'
+      - 'RETQ %eax'
+...
+---
 name:            jumptable_psv
 tracksRegLiveness: true
 liveins:
-- 
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