xref: /llvm-project/llvm/test/Transforms/InstCombine/fold-ext-eq-c-with-op.ll (revision a105877646d68e48cdeeeadd9d1e075dc3c5d68d)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -passes=instcombine -S | FileCheck %s
3
4declare void @use.i8(i8)
5define i8 @fold_add_zext_eq_0(i8 %x) {
6; CHECK-LABEL: @fold_add_zext_eq_0(
7; CHECK-NEXT:    [[R:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 1)
8; CHECK-NEXT:    ret i8 [[R]]
9;
10  %x_eq = icmp eq i8 %x, 0
11  %x_eq_ext = zext i1 %x_eq to i8
12  %r = add i8 %x, %x_eq_ext
13  ret i8 %r
14}
15
16define <2 x i8> @fold_add_sext_eq_4_6(<2 x i6> %xx) {
17; CHECK-LABEL: @fold_add_sext_eq_4_6(
18; CHECK-NEXT:    [[X:%.*]] = zext <2 x i6> [[XX:%.*]] to <2 x i8>
19; CHECK-NEXT:    [[X_EQ:%.*]] = icmp eq <2 x i8> [[X]], <i8 4, i8 -127>
20; CHECK-NEXT:    [[R:%.*]] = select <2 x i1> [[X_EQ]], <2 x i8> <i8 3, i8 -128>, <2 x i8> [[X]]
21; CHECK-NEXT:    ret <2 x i8> [[R]]
22;
23  %x = zext <2 x i6> %xx to <2 x i8>
24  %x_eq = icmp eq <2 x i8> %x, <i8 4, i8 129>
25  %x_eq_ext = sext <2 x i1> %x_eq to <2 x i8>
26  %r = add <2 x i8> %x_eq_ext, %x
27  ret <2 x i8> %r
28}
29
30define i8 @fold_add_zext_eq_0_fail_multiuse_exp(i8 %x) {
31; CHECK-LABEL: @fold_add_zext_eq_0_fail_multiuse_exp(
32; CHECK-NEXT:    [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 0
33; CHECK-NEXT:    [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
34; CHECK-NEXT:    [[R:%.*]] = add i8 [[X]], [[X_EQ_EXT]]
35; CHECK-NEXT:    call void @use.i8(i8 [[X_EQ_EXT]])
36; CHECK-NEXT:    ret i8 [[R]]
37;
38  %x_eq = icmp eq i8 %x, 0
39  %x_eq_ext = zext i1 %x_eq to i8
40  %r = add i8 %x, %x_eq_ext
41  call void @use.i8(i8 %x_eq_ext)
42  ret i8 %r
43}
44
45define i8 @fold_add_sext_eq_4_fail_wrong_cond(i8 %x, i8 %y) {
46; CHECK-LABEL: @fold_add_sext_eq_4_fail_wrong_cond(
47; CHECK-NEXT:    [[X_EQ:%.*]] = icmp eq i8 [[Y:%.*]], 4
48; CHECK-NEXT:    [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
49; CHECK-NEXT:    [[R:%.*]] = add i8 [[X:%.*]], [[X_EQ_EXT]]
50; CHECK-NEXT:    call void @use.i8(i8 [[X_EQ_EXT]])
51; CHECK-NEXT:    ret i8 [[R]]
52;
53  %x_eq = icmp eq i8 %y, 4
54  %x_eq_ext = sext i1 %x_eq to i8
55  %r = add i8 %x, %x_eq_ext
56  call void @use.i8(i8 %x_eq_ext)
57  ret i8 %r
58}
59