1 files changed, 20 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp b/llvm/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
index 1876dc3f712..f6bdbf5e9be 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
@@ -301,6 +301,26 @@ void AMDGPUAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     MCInstLowering.lower(MI, TmpInst);
     EmitToStreamer(*OutStreamer, TmpInst);
 
+#ifdef EXPENSIVE_CHECKS
+    // Sanity-check getInstSizeInBytes on explicitly specified CPUs (it cannot
+    // work correctly for the generic CPU).
+    //
+    // The isPseudo check really shouldn't be here, but unfortunately there are
+    // some negative lit tests that depend on being able to continue through
+    // here even when pseudo instructions haven't been lowered.
+    if (!MI->isPseudo() && STI.isCPUStringValid(STI.getCPU())) {
+      SmallVector<MCFixup, 4> Fixups;
+      SmallVector<char, 16> CodeBytes;
+      raw_svector_ostream CodeStream(CodeBytes);
+
+      std::unique_ptr<MCCodeEmitter> InstEmitter(createSIMCCodeEmitter(
+          *STI.getInstrInfo(), *OutContext.getRegisterInfo(), OutContext));
+      InstEmitter->encodeInstruction(TmpInst, CodeStream, Fixups, STI);
+
+      assert(CodeBytes.size() == STI.getInstrInfo()->getInstSizeInBytes(*MI));
+    }
+#endif
+
     if (STI.dumpCode()) {
       // Disassemble instruction/operands to text.
       DisasmLines.resize(DisasmLines.size() + 1);