diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1415,7 +1415,10 @@
       });
       R << "BasicBlock: " << ore::NV("BasicBlock", MBB.getName()) << "\n";
       for (auto &KV : MnemonicVec) {
-        auto Name = (Twine("INST_") + KV.first.trim()).str();
+        auto Name = (Twine("INST_") + KV.first.trim().take_until([](char c) {
+                      return c == ' ' || c == '\t' || c == '\n' || c == '\v' ||
+                             c == '\f' || c == '\r';
+                    })).str();
         R << KV.first << ": " << ore::NV(Name, KV.second) << "\n";
       }
       ORE->emit(R);
diff --git a/llvm/test/CodeGen/PowerPC/instruction-mix-remarks-BCTRL_LWZinto_toc.ll b/llvm/test/CodeGen/PowerPC/instruction-mix-remarks-BCTRL_LWZinto_toc.ll
--- a/llvm/test/CodeGen/PowerPC/instruction-mix-remarks-BCTRL_LWZinto_toc.ll
+++ b/llvm/test/CodeGen/PowerPC/instruction-mix-remarks-BCTRL_LWZinto_toc.ll
@@ -6,8 +6,7 @@
 ; CHECK:  - String:          "\n"
 ; CHECK:  - String:          "bctrl\n\tld 2, "
 ; CHECK:  - String:          ': '
-; CHECK:  - INST_bctrl
-; CHECK:	ld 2,: '1'
+; CHECK:  - INST_bctrl:      '1'
 ; CHECK:  - String:          "\n"