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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -instcombine < %s | FileCheck %s
3
4define i16 @foo(i16 %x)  {
5; CHECK-LABEL: @foo(
6; CHECK-NEXT:    [[T1:%.*]] = and i16 [[X:%.*]], 255
7; CHECK-NEXT:    ret i16 [[T1]]
8;
9  %t1 = and i16 %x, 255
10  %t2 = zext i16 %t1 to i32
11  %t3 = icmp ult i32 %t2, 255
12  %t4 = select i1 %t3, i32 %t2, i32 255
13  %t5 = trunc i32 %t4 to i16
14  %t6 = and i16 %t5, 255
15  ret i16 %t6
16}
17
18; This contains a min/max pair to clamp a value to 12 bits.
19; By analyzing the clamp pattern, we can tell the add doesn't have signed overflow.
20define i16 @min_max_clamp(i16 %x) {
21; CHECK-LABEL: @min_max_clamp(
22; CHECK-NEXT:    [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048
23; CHECK-NEXT:    [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048
24; CHECK-NEXT:    [[C:%.*]] = icmp slt i16 [[B]], 2047
25; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047
26; CHECK-NEXT:    [[E:%.*]] = add nsw i16 [[D]], 1
27; CHECK-NEXT:    ret i16 [[E]]
28;
29  %a = icmp sgt i16 %x, -2048
30  %b = select i1 %a, i16 %x, i16 -2048
31  %c = icmp slt i16 %b, 2047
32  %d = select i1 %c, i16 %b, i16 2047
33  %e = add i16 %d, 1
34  ret i16 %e
35}
36
37; Same as above with min/max reversed.
38define i16 @min_max_clamp_2(i16 %x) {
39; CHECK-LABEL: @min_max_clamp_2(
40; CHECK-NEXT:    [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047
41; CHECK-NEXT:    [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047
42; CHECK-NEXT:    [[C:%.*]] = icmp sgt i16 [[B]], -2048
43; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048
44; CHECK-NEXT:    [[E:%.*]] = add nsw i16 [[D]], 1
45; CHECK-NEXT:    ret i16 [[E]]
46;
47  %a = icmp slt i16 %x, 2047
48  %b = select i1 %a, i16 %x, i16 2047
49  %c = icmp sgt i16 %b, -2048
50  %d = select i1 %c, i16 %b, i16 -2048
51  %e = add i16 %d, 1
52  ret i16 %e
53}
54
55; This contains a min/max pair to clamp a value to 12 bits.
56; By analyzing the clamp pattern, we can tell that the second add doesn't
57; overflow the original type and can be moved before the extend.
58define i32 @min_max_clamp_3(i16 %x) {
59; CHECK-LABEL: @min_max_clamp_3(
60; CHECK-NEXT:    [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048
61; CHECK-NEXT:    [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048
62; CHECK-NEXT:    [[C:%.*]] = icmp slt i16 [[B]], 2047
63; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047
64; CHECK-NEXT:    [[G:%.*]] = sext i16 [[D]] to i32
65; CHECK-NEXT:    ret i32 [[G]]
66;
67  %a = icmp sgt i16 %x, -2048
68  %b = select i1 %a, i16 %x, i16 -2048
69  %c = icmp slt i16 %b, 2047
70  %d = select i1 %c, i16 %b, i16 2047
71  %e = add i16 %d, 1
72  %f = sext i16 %e to i32
73  %g = add i32 %f, -1
74  ret i32 %g
75}
76
77; Same as above with min/max order reversed
78define i32 @min_max_clamp_4(i16 %x) {
79; CHECK-LABEL: @min_max_clamp_4(
80; CHECK-NEXT:    [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047
81; CHECK-NEXT:    [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047
82; CHECK-NEXT:    [[C:%.*]] = icmp sgt i16 [[B]], -2048
83; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048
84; CHECK-NEXT:    [[G:%.*]] = sext i16 [[D]] to i32
85; CHECK-NEXT:    ret i32 [[G]]
86;
87  %a = icmp slt i16 %x, 2047
88  %b = select i1 %a, i16 %x, i16 2047
89  %c = icmp sgt i16 %b, -2048
90  %d = select i1 %c, i16 %b, i16 -2048
91  %e = add i16 %d, 1
92  %f = sext i16 %e to i32
93  %g = add i32 %f, -1
94  ret i32 %g
95}
96