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dae28732f4
We've rejected these kinds of functions since r28405 in 2006 because it's impossible to lower the return of a callee cleanup varargs function. However there are lots of legal ways to leave such a function without returning, such as aborting. Today we can leave a function with a musttail call to another function with the correct prototype, and everything works out. I'm removing the verifier check declaring that a normal return from such a function is UB. Reviewed By: nlewycky Differential Revision: http://reviews.llvm.org/D5059 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216779 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.1 KiB
LLVM
40 lines
1.1 KiB
LLVM
; RUN: llvm-as %s -o /dev/null
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; Should assemble without error.
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declare void @similar_param_ptrty_callee(i8*)
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define void @similar_param_ptrty(i32*) {
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musttail call void @similar_param_ptrty_callee(i8* null)
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ret void
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}
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declare i8* @similar_ret_ptrty_callee()
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define i32* @similar_ret_ptrty() {
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%v = musttail call i8* @similar_ret_ptrty_callee()
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%w = bitcast i8* %v to i32*
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ret i32* %w
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}
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declare x86_thiscallcc void @varargs_thiscall(i8*, ...)
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define x86_thiscallcc void @varargs_thiscall_thunk(i8* %this, ...) {
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musttail call x86_thiscallcc void (i8*, ...)* @varargs_thiscall(i8* %this, ...)
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ret void
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}
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declare x86_fastcallcc void @varargs_fastcall(i8*, ...)
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define x86_fastcallcc void @varargs_fastcall_thunk(i8* %this, ...) {
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musttail call x86_fastcallcc void (i8*, ...)* @varargs_fastcall(i8* %this, ...)
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ret void
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}
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define x86_thiscallcc void @varargs_thiscall_unreachable(i8* %this, ...) {
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unreachable
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}
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define x86_thiscallcc void @varargs_thiscall_ret_unreachable(i8* %this, ...) {
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musttail call x86_thiscallcc void (i8*, ...)* @varargs_thiscall(i8* %this, ...)
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ret void
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bb1:
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ret void
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}
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