http://llvm.org/bugs/show_bug.cgi?id=11158
Summary: ALL backends need to implement efficient trunc-store
sequences
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The type-legalizer often generates trunc store or anyext loads. The
type-legalizer attempts to promote elements in order to fit the vector type
into a physical register. This is a good idea because the instruction set for
non-common types tends to be sparse. However, the data is saved in memory in
its 'legal' form and trunc-ing or anyext-ing is needed.
Look at the x86backend (combine dag for load/store) for an example.
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