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-rw-r--r--src/synth/synth-vhdl_oper.adb4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/synth/synth-vhdl_oper.adb b/src/synth/synth-vhdl_oper.adb
index 4a2f4d71e..274306245 100644
--- a/src/synth/synth-vhdl_oper.adb
+++ b/src/synth/synth-vhdl_oper.adb
@@ -1959,7 +1959,9 @@ package body Synth.Vhdl_Oper is
return Create_Value_Net (Edge, Res_Typ);
end;
when Iir_Predefined_Ieee_1164_Is_X_Log
- | Iir_Predefined_Ieee_1164_Is_X_Slv =>
+ | Iir_Predefined_Ieee_1164_Is_X_Slv
+ | Iir_Predefined_Ieee_Numeric_Std_Is_X_Sgn
+ | Iir_Predefined_Ieee_Numeric_Std_Is_X_Uns =>
-- Always false.
return Create_Value_Discrete (0, Boolean_Type);
when Iir_Predefined_Ieee_1164_To_Bitvector