[RISCV][llvm-exegesis] Disable pseudo instructions in allowAsBackToBa…

…ck. (llvm#122986) Prevents crashes trying to encode pseudo instuctions. Tested on HiFive Premier P550. Fixes llvm#122974
paulhuggett · Jan 16, 2025 · 59bec4d · 59bec4d
1 parent 6996a4b
commit 59bec4d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/llvm/tools/llvm-exegesis/lib/RISCV/Target.cpp b/llvm/tools/llvm-exegesis/lib/RISCV/Target.cpp
@@ -122,6 +122,10 @@ class ExegesisRISCVTarget : public ExegesisTarget {
 
   ArrayRef<unsigned> getUnavailableRegisters() const override;
 
+  bool allowAsBackToBack(const Instruction &Instr) const override {
+    return !Instr.Description.isPseudo();
+  }
+
   Error randomizeTargetMCOperand(const Instruction &Instr, const Variable &Var,
                                  MCOperand &AssignedValue,
                                  const BitVector &ForbiddenRegs) const override;