document new sig

test/benchmarks/README.md

@@ -12,10 +12,12 @@ Execution case is specified by 6 lines:
 
 1. The case name. Must not be empty.
 2. The exported wasm function name to be executed.
-3. The function arguments as space-separated list of integers. May be empty.
-4. The hex-encoded bytes of the initial memory. May be empty.
-5. The expected result as an integer. Empty line means no result is expected.
-6. The hex-encoded bytes of the expected memory after execution. 
+3. The function type where the parameter type(s) and the result type is separated with a colon (`:`).
+   The only allowed types currently are `i` for i32 and `I` for i64. e.g. `i:` for i32 input and no result.
+4. The function arguments as space-separated list of integers. May be empty.
+5. The hex-encoded bytes of the initial memory. May be empty.
+6. The expected result as an integer. Empty line means no result is expected.
+7. The hex-encoded bytes of the expected memory after execution. 
    If empty, result memory will not be checked.
 
 Additional empty lines are allowed before each case.
@@ -25,13 +27,15 @@ Additional empty lines are allowed before each case.
 ```
 case_1
 testFunction
+iii:i
 2 3 4
 000000ff
 1
 ff000000ff000000
 
 case_2
 memset
+iii:
 0 0xfe 3