28 lines
568 B
LLVM
28 lines
568 B
LLVM
|
; Test merging of blocks that only have PHI nodes in them. This tests the case
|
||
|
|
; where the mergedinto block doesn't have any PHI nodes, and is in fact
|
||
|
|
; dominated by the block-to-be-eliminated
|
||
|
|
;
|
||
|
|
; RUN: opt < %s -simplifycfg -S | not grep N:
|
||
|
|
;
|
||
|
|
|
||
|
|
declare i1 @foo()
|
||
|
|
|
||
|
|
define i32 @test(i1 %a, i1 %b) {
|
||
|
|
%c = call i1 @foo()
|
||
|
|
br i1 %c, label %N, label %P
|
||
|
|
P:
|
||
|
|
%d = call i1 @foo()
|
||
|
|
br i1 %d, label %N, label %Q
|
||
|
|
Q:
|
||
|
|
br label %N
|
||
|
|
N:
|
||
|
|
%W = phi i32 [0, %0], [1, %Q], [2, %P]
|
||
|
|
; This block should be foldable into M
|
||
|
|
br label %M
|
||
|
|
|
||
|
|
M:
|
||
|
|
%R = add i32 %W, 1
|
||
|
|
ret i32 %R
|
||
|
|
}
|
||
|
|
|