1; RUN: opt -instcombine -S < %s | FileCheck %s
2
3target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
4
5define i32 @test_load_cast_combine_tbaa(float* %ptr) {
6; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA.
7; CHECK-LABEL: @test_load_cast_combine_tbaa(
8; CHECK: load i32* %{{.*}}, !tbaa !0
9entry:
10  %l = load float* %ptr, !tbaa !0
11  %c = bitcast float %l to i32
12  ret i32 %c
13}
14
15define i32 @test_load_cast_combine_noalias(float* %ptr) {
16; Ensure (cast (load (...))) -> (load (cast (...))) preserves no-alias metadata.
17; CHECK-LABEL: @test_load_cast_combine_noalias(
18; CHECK: load i32* %{{.*}}, !alias.scope !2, !noalias !1
19entry:
20  %l = load float* %ptr, !alias.scope !2, !noalias !1
21  %c = bitcast float %l to i32
22  ret i32 %c
23}
24
25define float @test_load_cast_combine_range(i32* %ptr) {
26; Ensure (cast (load (...))) -> (load (cast (...))) drops range metadata. It
27; would be nice to preserve or update it somehow but this is hard when moving
28; between types.
29; CHECK-LABEL: @test_load_cast_combine_range(
30; CHECK: load float* %{{.*}}
31; CHECK-NOT: !range
32; CHECK: ret float
33entry:
34  %l = load i32* %ptr, !range !5
35  %c = bitcast i32 %l to float
36  ret float %c
37}
38
39define i32 @test_load_cast_combine_invariant(float* %ptr) {
40; Ensure (cast (load (...))) -> (load (cast (...))) preserves invariant metadata.
41; CHECK-LABEL: @test_load_cast_combine_invariant(
42; CHECK: load i32* %{{.*}}, !invariant.load !3
43entry:
44  %l = load float* %ptr, !invariant.load !3
45  %c = bitcast float %l to i32
46  ret i32 %c
47}
48
49define i32 @test_load_cast_combine_nontemporal(float* %ptr) {
50; Ensure (cast (load (...))) -> (load (cast (...))) preserves nontemporal
51; metadata.
52; CHECK-LABEL: @test_load_cast_combine_nontemporal(
53; CHECK: load i32* %{{.*}}, !nontemporal !4
54entry:
55  %l = load float* %ptr, !nontemporal !4
56  %c = bitcast float %l to i32
57  ret i32 %c
58}
59
60define void @test_load_cast_combine_loop(float* %src, i32* %dst, i32 %n) {
61; Ensure (cast (load (...))) -> (load (cast (...))) preserves loop access
62; metadata.
63; CHECK-LABEL: @test_load_cast_combine_loop(
64; CHECK: load i32* %{{.*}}, !llvm.mem.parallel_loop_access !1
65entry:
66  br label %loop
67
68loop:
69  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
70  %src.gep = getelementptr inbounds float* %src, i32 %i
71  %dst.gep = getelementptr inbounds i32* %dst, i32 %i
72  %l = load float* %src.gep, !llvm.mem.parallel_loop_access !1
73  %c = bitcast float %l to i32
74  store i32 %c, i32* %dst.gep
75  %i.next = add i32 %i, 1
76  %cmp = icmp slt i32 %i.next, %n
77  br i1 %cmp, label %loop, label %exit, !llvm.loop !1
78
79exit:
80  ret void
81}
82
83!0 = !{ !1, !1, i64 0 }
84!1 = !{ !1 }
85!2 = !{ !2, !1 }
86!3 = !{ }
87!4 = !{ i32 1 }
88!5 = !{ i32 0, i32 42 }
89