1; If we have an 'and' of the result of an 'or', and one of the 'or' operands
2; cannot have contributed any of the resultant bits, delete the or.  This
3; occurs for very common C/C++ code like this:
4;
5; struct foo { int A : 16; int B : 16; };
6; void test(struct foo *F, int X, int Y) {
7;        F->A = X; F->B = Y;
8; }
9;
10; Which corresponds to test1.
11;
12; This tests arbitrary precision integers.
13
14; RUN: opt < %s -instcombine -S | not grep "or "
15; END.
16
17define i17 @test1(i17 %X, i17 %Y) {
18	%A = and i17 %X, 7
19	%B = and i17 %Y, 8
20	%C = or i17 %A, %B
21	%D = and i17 %C, 7  ;; This cannot include any bits from %Y!
22	ret i17 %D
23}
24
25define i49 @test3(i49 %X, i49 %Y) {
26	%B = shl i49 %Y, 1
27	%C = or i49 %X, %B
28	%D = and i49 %C, 1  ;; This cannot include any bits from %Y!
29	ret i49 %D
30}
31
32define i67 @test4(i67 %X, i67 %Y) {
33	%B = lshr i67 %Y, 66
34	%C = or i67 %X, %B
35	%D = and i67 %C, 2  ;; This cannot include any bits from %Y!
36	ret i67 %D
37}
38
39define i231 @or_test1(i231 %X, i231 %Y) {
40	%A = and i231 %X, 1
41	%B = or i231 %A, 1     ;; This cannot include any bits from X!
42	ret i231 %B
43}
44
45define i7 @or_test2(i7 %X, i7 %Y) {
46	%A = shl i7 %X, 6
47	%B = or i7 %A, 64     ;; This cannot include any bits from X!
48	ret i7 %B
49}
50
51