%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
+}