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implement a TODO by teaching jump threading about "xor x, 1".

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-11-10 22:39:16 +00:00
parent 40d8c28b27
commit 055d046f48
2 changed files with 53 additions and 2 deletions
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39
test/Transforms/JumpThreading/basic.ll
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@ -245,3 +245,42 @@ Y:
ret i32 2
}
;;; Verify that we can handle constraint propagation through "xor x, 1".
define i32 @test9(i1 %cond, i1 %cond2) {
Entry:
; CHECK: @test9
%v1 = call i32 @f1()
br i1 %cond, label %Merge, label %F1
; CHECK: Entry:
; CHECK-NEXT: %v1 = call i32 @f1()
; CHECK-NEXT: br i1 %cond, label %F2, label %Merge
F1:
%v2 = call i32 @f2()
br label %Merge
Merge:
%B = phi i32 [%v1, %Entry], [%v2, %F1]
%M = icmp eq i32 %B, %v1
%M1 = xor i1 %M, 1
%N = icmp eq i32 %B, 47
%O = and i1 %M1, %N
br i1 %O, label %T2, label %F2
; CHECK: Merge:
; CHECK-NOT: phi
; CHECK-NEXT: %v2 = call i32 @f2()
T2:
%Q = zext i1 %M to i32
ret i32 %Q
F2:
ret i32 %B
; CHECK: F2:
; CHECK-NEXT: phi i32
}