http://llvm.org/bugs/show_bug.cgi?id=16742
Bug ID: 16742
Summary: zeroext i1 returning functions don't get TCO
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Running this through clang:
bool g(); bool f() { return g(); }
Generates this:
define zeroext i1 @_Z1fv() #0 {
entry:
%call = tail call zeroext i1 @_Z1gv()
ret i1 %call
}
declare zeroext i1 @_Z1gv() #1
... which produces suboptimal assembly:
_Z1fv: # @_Z1fv
pushq %rax
callq _Z1gv
popq %rdx
ret
If I strip out the 'zeroext' and run through llc, I instead get this:
_Z1fv: # @_Z1fv
jmp _Z1gv # TAILCALL
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