https://llvm.org/bugs/show_bug.cgi?id=23420
Bug ID: 23420
Summary: Exploit LRVH/STRVH/MVCIN for byte swaps
Product: libraries
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: SystemZ
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
System z currently uses the word and doubleword forms of LOAD REVERSED
and STORE REVERSED to optimize byte-swap idioms.
However, the architecture also provides halfword forms of those
instructions which could be exploited likewise.
In addition, the architecture provides a MOVE INVERSE instruction that
can be used to implement a direct memory-to-memory version of byte-swap
(of any length, in particular including halfword, word, and doubleword).
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