From d3be0b160ec980c3f5fe5f4dabab1d81dac0425e Mon Sep 17 00:00:00 2001
From: Clement Courbet <courbet@google.com>
Date: Mon, 2 Nov 2020 15:01:21 +0100
Subject: [PATCH] [llvm-exegesis][X86] Ignore a few unmeasurable opcodes.

Differential Revision: https://reviews.llvm.org/D90744
---
 tools/llvm-exegesis/lib/X86/Target.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/llvm-exegesis/lib/X86/Target.cpp b/tools/llvm-exegesis/lib/X86/Target.cpp
index 15fa54e2f6a..96781dd807a 100644
--- a/tools/llvm-exegesis/lib/X86/Target.cpp
+++ b/tools/llvm-exegesis/lib/X86/Target.cpp
@@ -196,6 +196,21 @@ static const char *isInvalidOpcode(const Instruction &Instr) {
   if (OpcodeName.startswith("POP") || OpcodeName.startswith("PUSH") ||
       OpcodeName.startswith("ADJCALLSTACK") || OpcodeName.startswith("LEAVE"))
     return "unsupported opcode: Push/Pop/AdjCallStack/Leave";
+  switch (Instr.Description.Opcode) {
+  case X86::LFS16rm:
+  case X86::LFS32rm:
+  case X86::LFS64rm:
+  case X86::LGS16rm:
+  case X86::LGS32rm:
+  case X86::LGS64rm:
+  case X86::LSS16rm:
+  case X86::LSS32rm:
+  case X86::LSS64rm:
+  case X86::SYSENTER:
+    return "unsupported opcode";
+  default:
+    break;
+  }
   if (const auto reason = isInvalidMemoryInstr(Instr))
     return reason;
   // We do not handle instructions with OPERAND_PCREL.