38 lines
921 B
LLVM
38 lines
921 B
LLVM
; RUN: opt < %s -reassociate -disable-output
|
|
|
|
; It has been detected that dead loops like the one in this test case can be
|
|
; created by -jump-threading (it was detected by a csmith generated program).
|
|
;
|
|
; According to -verify this is valid input (even if it could be discussed if
|
|
; the dead loop really satisfies SSA form).
|
|
;
|
|
; The problem found was that the -reassociate pass ends up in an infinite loop
|
|
; when analysing the 'deadloop1' basic block. See "Bugzilla - Bug 30818".
|
|
define void @deadloop1() {
|
|
br label %endlabel
|
|
|
|
deadloop1:
|
|
%1 = xor i32 %2, 7
|
|
%2 = xor i32 %1, 8
|
|
br label %deadloop1
|
|
|
|
endlabel:
|
|
ret void
|
|
}
|
|
|
|
|
|
; Another example showing that dead code could result in infinite loops in
|
|
; reassociate pass. See "Bugzilla - Bug 30818".
|
|
define void @deadloop2() {
|
|
br label %endlabel
|
|
|
|
deadloop2:
|
|
%1 = and i32 %2, 7
|
|
%2 = and i32 %3, 8
|
|
%3 = and i32 %1, 6
|
|
br label %deadloop2
|
|
|
|
endlabel:
|
|
ret void
|
|
}
|