Classification of the invalid executions of the ARM llh model

In this note we classify the execution that are forbidden by the ARM llh model, yet observed on hardware, or invalid executions. We use the classification of invalid states of the original model defined here.

The following two tables give the number of invalid tests and executions by batch. For instance the S batch gathers 3828 tests (4942960 executions), of which 15 (144 executions) invalidate the ARM llh model. One may observe that the sum of batch size as number of executions (Row “Sum”) equals the number of all invalid executions (Row “All” in the right table below).

Number of tests
 BatchInvalid
ALL 5670 33
S 3828 15
T 961 0
O 0 0
P 2231 0
ST 1030 0
SO 619 5
SP 1700 3
TO 0 0
TP 96 0
OP 925 21
STO 174 0
STP 35 0
SOP 1048 9
TOP 1 0
STOP 103 0
Sum1275153
        
Number of executions
 BatchInvalid
ALL 14024448 1160
S 4942960 144
T 7360 0
O 0 0
P 8819 0
ST 304523 0
SO 2726852 16
SP 241852 10
TO 0 0
TP 149 0
OP 9431 460
STO 99767 0
STP 1945 0
SOP 5377621 530
TOP 1 0
STOP 303168 0
Sum140244481160

The All table gathers all invalid executions, with links to the relevant, more specific, batches on a test by test basis.

Invalid executions are observed only on quadcores implementations of the ARM architecture. We also give tables for those, namely Tegra3 and Exynos4412.


This document was translated from LATEX by HEVEA.