Missing self tests for shift

This request comes from a problem we experienced in the field due to some bit-twiddling. The Perl code that was used was similar to the following:

i << 32 >> 32

On 32-bit machines it was intended to result in the original 32-bit word. On 64-bit machines it was intended to clear the high 32-bit word, so only the low 32-bit word remained.

The pattern worked as expected on most Intel machines. But it failed on Solaris i86pc.

Looking back, we built Perl from sources because Sun is a ransomware platform. We did not want to buy Sun's updates so we built the latest Perl ourselves. After the build we ran the self-tests to ensure there were no problems.

In hindsight I think we should have been alerted to a failure when the shift amount exceeded the word size. Or, Perl could set the value to 0 when the shift amount exceeded the word size. In either case, there should probably be test cases for:

# OK on all platforms
i << 30

# OK on all platforms when using unsigned types
i << 31

# OK on 64-bit platforms, what does one expect on 32-bit platforms?
i << 32
i << 33

# What does one expect on 32-bit and 64-bit platforms?
i << 64
i << 65

The issue names no file or existing test; begin by locating Perl's self-tests for shift operations and reproducing the listed shifts on 32-bit and 64-bit targets, including Solaris i86pc if available. Read the current platform-dependent behavior and establish the intended outcomes before adding coverage; done means the agreed cases are exercised by the self-test suite.