X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=test%2FTransforms%2FInstCombine%2Fsub-xor.ll;h=e7aff00ba8d04f7b4e3c538a9c4401ac4538e804;hb=b55dcfe47fbbcfc1dccd07cb27c02b9a86533d05;hp=41e01fbdae8b38524e98c4aeda06a1f4335d8cc8;hpb=1fdfae05b0a4356d1ed0633bf3d6cdc6eba2e173;p=oota-llvm.git

diff --git a/test/Transforms/InstCombine/sub-xor.ll b/test/Transforms/InstCombine/sub-xor.ll
index 41e01fbdae8..e7aff00ba8d 100644
--- a/test/Transforms/InstCombine/sub-xor.ll
+++ b/test/Transforms/InstCombine/sub-xor.ll
@@ -5,8 +5,43 @@ define i32 @test1(i32 %x) nounwind {
   %sub = sub i32 63, %and
   ret i32 %sub
 
-; CHECK: @test1
+; CHECK-LABEL: @test1(
 ; CHECK-NEXT: and i32 %x, 31
 ; CHECK-NEXT: xor i32 %and, 63
 ; CHECK-NEXT: ret
 }
+
+declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
+
+define i32 @test2(i32 %x) nounwind {
+  %count = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true) nounwind readnone
+  %sub = sub i32 31, %count
+  ret i32 %sub
+
+; CHECK-LABEL: @test2(
+; CHECK-NEXT: ctlz
+; CHECK-NEXT: xor i32 %count, 31
+; CHECK-NEXT: ret
+}
+
+define i32 @test3(i32 %x) nounwind {
+  %and = and i32 %x, 31
+  %sub = xor i32 31, %and
+  %add = add i32 %sub, 42
+  ret i32 %add
+
+; CHECK-LABEL: @test3(
+; CHECK-NEXT: and i32 %x, 31
+; CHECK-NEXT: sub i32 73, %and
+; CHECK-NEXT: ret
+}
+
+define i32 @test4(i32 %x) nounwind {
+  %sub = xor i32 %x, 2147483648
+  %add = add i32 %sub, 42
+  ret i32 %add
+
+; CHECK-LABEL: @test4(
+; CHECK-NEXT: add i32 %x, -2147483606
+; CHECK-NEXT: ret
+}