http://llvm.org/bugs/show_bug.cgi?id=10327
Summary: unnecessary mov
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
We codegen
define void @zed(i8* %cx) nounwind uwtable ssp {
entry:
tail call void @foo(i8* %cx) nounwind
tail call void @bar(i8* %cx) nounwind
ret void
}
declare void @foo(i8*)
declare void @bar(i8*)
into
pushq %rbx
movq %rdi, %rbx
movq %rbx, %rdi
callq __Z3fooPv
movq %rbx, %rdi
popq %rbx
jmp __Z3barPv
note the funny rdi -> rbx -> rdi moves.
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