(ZeroExt32to64 x:(I64Load32U _ _)) => x
(ZeroExt16to(64|32) x:(I64Load16U _ _)) => x
(ZeroExt8to(64|32|16) x:(I64Load8U _ _)) => x
-(SignExt32to64 x) && objabi.GOWASM.SignExt => (I64Extend32S x)
-(SignExt8to(64|32|16) x) && objabi.GOWASM.SignExt => (I64Extend8S x)
-(SignExt16to(64|32) x) && objabi.GOWASM.SignExt => (I64Extend16S x)
+(SignExt32to64 x) && buildcfg.GOWASM.SignExt => (I64Extend32S x)
+(SignExt8to(64|32|16) x) && buildcfg.GOWASM.SignExt => (I64Extend8S x)
+(SignExt16to(64|32) x) && buildcfg.GOWASM.SignExt => (I64Extend16S x)
(SignExt32to64 x) => (I64ShrS (I64Shl x (I64Const [32])) (I64Const [32]))
(SignExt16to(64|32) x) => (I64ShrS (I64Shl x (I64Const [48])) (I64Const [48]))
(SignExt8to(64|32|16) x) => (I64ShrS (I64Shl x (I64Const [56])) (I64Const [56]))