majnemer added a comment.
In https://reviews.llvm.org/D22900#498793, @Gerolf wrote:
> Nope, I don't see the tail call. Anyway, I'll simplify my test case. Don't
> worry about it.
>
> clang++ -cc1 -x c++ -emit-llvm -triple i386-apple-darwin9 t.cpp
>
> cat t.ll:
>
> ; ModuleID = 't.cpp'
> source_filename = "t.cpp"
> target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
> target triple = "i386-apple-darwin9"
>
> %struct.C = type { %struct.CBase, %struct.I }
> %struct.CBase = type { i32 (...)** }
> %struct.I = type { i32 (...)** }
> %struct.LARGE = type { %union.anon }
> %union.anon = type { i32 }
>
> ; Function Attrs: nounwind
> define void @_ZN1C4SeekE5LARGE(%struct.C* %this, %struct.LARGE* byval align
> 4) #0 align 2 {
> entry:
>
> %this.addr = alloca %struct.C*, align 4
> store %struct.C* %this, %struct.C** %this.addr, align 4
> %this1 = load %struct.C*, %struct.C** %this.addr, align 4
> ret void
>
> }
>
> attributes #0 = { nounwind "disable-tail-calls"="false"
> "less-precise-fpmad"="false" "no-frame-pointer-elim"="false"
> "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false"
> "stack-protector-buffer-size"="8" "target-features"="+x87"
> "unsafe-fp-math"="false" "use-soft-float"="false" }
D'oh, that m_fn1 should have been Seek :/
$ cat t.ii
struct LARGE {
union {
int i;
};
};
struct I {
virtual void m_fn1(LARGE);
};
struct CBase {
virtual ~CBase();
};
struct C : CBase, I {
void m_fn1(LARGE);
};
void C::m_fn1(LARGE) {}
$ ~/llvm/Debug+Asserts/bin/clang -cc1 -x c++ -emit-llvm -triple
i386-apple-darwin9 t.ii && grep tail t.ll
tail call void @_ZN1C5m_fn1E5LARGE(%struct.C* %3, %struct.LARGE* byval align
4 %0)
https://reviews.llvm.org/D22900
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