http://llvm.org/bugs/show_bug.cgi?id=4058
Summary: ARM: i64 arguments may be split between registers and
stack with AAPCS ABI
Product: libraries
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P2
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The AAPCS ARM ABI requires that i64 arguments be passed in even/odd registers
pairs or on the stack with 8-byte alignment. LLVM currently splits up i64
arguments into pairs of i32 values. The ARMCallingConv.td file attempts to
handle this by checking for i32 types with 8-byte alignment, and it does manage
to get them into even/odd registers, but it fails to prevent them from being
split with one word in r3 and the other on the stack.
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