llvm-project/llvm/test/Transforms/SimplifyCFG/EqualPHIEdgeBlockMerge.ll

; Test merging of blocks with phi nodes.
;
; RUN: llvm-upgrade < %s | llvm-as | opt -simplifycfg | llvm-dis | not grep N:
;

int %test(bool %a) {
Q:
	br bool %a, label %N, label %M
N:
	br label %M
M:
	; It's ok to merge N and M because the incoming values for W are the 
        ; same for both cases...
	%W = phi int [2, %N], [2, %Q]
	%R = add int %W, 1
	ret int %R
}