diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -3002,13 +3002,20 @@
 }
 
 /// parseDirectiveAscii:
-///   ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
+///   ::= .ascii [ "string" ( ( , ) "string" )* ]
+///   ::= ( .asciz | .string ) [ "string" ( , "string" )* ]
 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
   auto parseOp = [&]() -> bool {
     std::string Data;
-    if (checkForValidSection() || parseEscapedString(Data))
+    if (checkForValidSection())
       return true;
-    getStreamer().emitBytes(Data);
+    // Only support spaces as separators for .ascii directive for now. See the
+    // discusssion at https://reviews.llvm.org/D91460 for more details
+    do {
+      if (parseEscapedString(Data))
+        return true;
+      getStreamer().emitBytes(Data);
+    } while (!ZeroTerminated && getTok().is(AsmToken::String));
     if (ZeroTerminated)
       getStreamer().emitBytes(StringRef("\0", 1));
     return false;
diff --git a/llvm/test/MC/AsmParser/directive_ascii.s b/llvm/test/MC/AsmParser/directive_ascii.s
--- a/llvm/test/MC/AsmParser/directive_ascii.s
+++ b/llvm/test/MC/AsmParser/directive_ascii.s
@@ -48,3 +48,10 @@
 TEST7:
         .ascii "\x64\Xa6B"
         .ascii "\xface\x0Fe"
+
+# CHECK: TEST8:
+# CHECK: .byte 65
+# CHECK: .byte 66
+# CHECK: .byte 67
+TEST8:
+        .ascii "A", "B" "C"