[llvm] r329048 - [X86][TableGen] Add a missing error check to make sure EVEX instructions use one PS/PD/XS/XD prefixes.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Mon Apr  2 23:37:01 2018
New Revision: 329048

URL: http://llvm.org/viewvc/llvm-project?rev=329048&view=rev
Log:
[X86][TableGen] Add a missing error check to make sure EVEX instructions use one PS/PD/XS/XD prefixes.

Modified:
    llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp

Modified: llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp?rev=329048&r1=329047&r2=329048&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp (original)
+++ llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp Mon Apr  2 23:37:01 2018
@@ -243,8 +243,12 @@ InstructionContext RecognizableInstr::in
       insnContext = EVEX_KB(IC_EVEX_XD);
     else if (OpPrefix == X86Local::XS)
       insnContext = EVEX_KB(IC_EVEX_XS);
-    else
+    else if (OpPrefix == X86Local::PS)
       insnContext = EVEX_KB(IC_EVEX);
+    else {
+      errs() << "Instruction does not use a prefix: " << Name << "\n";
+      llvm_unreachable("Invalid prefix");
+    }
     /// eof EVEX
   } else if (Encoding == X86Local::VEX || Encoding == X86Local::XOP) {
     if (HasVEX_LPrefix && VEX_WPrefix == X86Local::VEX_W1) {