When deterministic feature will be enabled (turned-off by default) it'll guarantee deterministic

execution of wasm programs across different hardware/circumstances.
This is very useful for Blockchain projects having wasm smart-contracts

This is critical for Blockchain projects that require execution to be deterministic
in order to reach a consensus of the state transition of each smart-contract transaction.

lib/runtime-core/src/codegen.rs

@@ -145,6 +145,9 @@ pub fn validating_parser_config(features: &Features) -> wasmparser::ValidatingPa
             enable_simd: features.simd,
             enable_bulk_memory: false,
             enable_multi_value: false,
+
+            #[cfg(feature = "deterministic")]
+            deterministic_only: true,
         },
     }
 }

lib/runtime-core/src/lib.rs

@@ -145,6 +145,9 @@ pub fn validate_and_report_errors_with_features(
             enable_multi_value: false,
             enable_reference_types: false,
             enable_threads: features.threads,
+
+            #[cfg(feature = "deterministic")]
+            deterministic_only: true,
         },
     };
     let mut parser = wasmparser::ValidatingParser::new(wasm, Some(config));