32 lines
1.1 KiB
LLVM
32 lines
1.1 KiB
LLVM
|
; Test for a problem afflicting several C++ programs in the testsuite. The
|
||
|
|
; instcombine pass is trying to get rid of the cast in the invoke instruction,
|
||
|
|
; inserting a cast of the return value after the PHI instruction, but which is
|
||
|
|
; used by the PHI instruction. This is bad: because of the semantics of the
|
||
|
|
; invoke instruction, we really cannot perform this transformation at all at
|
||
|
|
; least without splitting the critical edge.
|
||
|
|
;
|
||
|
|
; RUN: opt < %s -instcombine -disable-output
|
||
|
|
|
||
|
|
declare i8* @test()
|
||
|
|
|
||
|
|
define i32 @foo() {
|
||
|
|
entry:
|
||
|
|
br i1 true, label %cont, label %call
|
||
|
|
|
||
|
|
call: ; preds = %entry
|
||
|
|
%P = invoke i32* bitcast (i8* ()* @test to i32* ()*)( )
|
||
|
|
to label %cont unwind label %N ; <i32*> [#uses=1]
|
||
|
|
|
||
|
|
cont: ; preds = %call, %entry
|
||
|
|
%P2 = phi i32* [ %P, %call ], [ null, %entry ] ; <i32*> [#uses=1]
|
||
|
|
%V = load i32* %P2 ; <i32> [#uses=1]
|
||
|
|
ret i32 %V
|
||
|
|
|
||
|
|
N: ; preds = %call
|
||
|
|
%exn = landingpad {i8*, i32} personality i32 (...)* @__gxx_personality_v0
|
||
|
|
cleanup
|
||
|
|
ret i32 0
|
||
|
|
}
|
||
|
|
|
||
|
|
declare i32 @__gxx_personality_v0(...)
|