1 // compile-flags: -O -C no-prepopulate-passes
5 // FIXME(eddyb) all of these tests show memory stores and loads, even after a
6 // scalar `bitcast`, more special-casing is required to remove `alloca` usage.
8 // CHECK-LABEL: define{{.*}}i32 @f32_to_bits(float %x)
9 // CHECK: %2 = bitcast float %x to i32
10 // CHECK-NEXT: store i32 %2, i32* %0
11 // CHECK-NEXT: %3 = load i32, i32* %0
14 pub fn f32_to_bits(x: f32) -> u32 {
15 unsafe { std::mem::transmute(x) }
18 // CHECK-LABEL: define{{.*}}i8 @bool_to_byte(i1 noundef zeroext %b)
19 // CHECK: %1 = zext i1 %b to i8
20 // CHECK-NEXT: store i8 %1, i8* %0
21 // CHECK-NEXT: %2 = load i8, i8* %0
24 pub fn bool_to_byte(b: bool) -> u8 {
25 unsafe { std::mem::transmute(b) }
28 // CHECK-LABEL: define{{.*}}noundef zeroext i1 @byte_to_bool(i8 %byte)
29 // CHECK: %1 = trunc i8 %byte to i1
30 // CHECK-NEXT: %2 = zext i1 %1 to i8
31 // CHECK-NEXT: store i8 %2, i8* %0
32 // CHECK-NEXT: %3 = load i8, i8* %0
33 // CHECK-NEXT: %4 = trunc i8 %3 to i1
36 pub unsafe fn byte_to_bool(byte: u8) -> bool {
37 std::mem::transmute(byte)
40 // CHECK-LABEL: define{{.*}}i8* @ptr_to_ptr(i16* %p)
41 // CHECK: %2 = bitcast i16* %p to i8*
42 // CHECK-NEXT: store i8* %2, i8** %0
43 // CHECK-NEXT: %3 = load i8*, i8** %0
46 pub fn ptr_to_ptr(p: *mut u16) -> *mut u8 {
47 unsafe { std::mem::transmute(p) }
50 // HACK(eddyb) scalar `transmute`s between pointers and non-pointers are
51 // currently not special-cased like other scalar `transmute`s, because
52 // LLVM requires specifically `ptrtoint`/`inttoptr` instead of `bitcast`.
54 // Tests below show the non-special-cased behavior (with the possible
55 // future special-cased instructions in the "NOTE(eddyb)" comments).
57 // CHECK: define{{.*}}[[USIZE:i[0-9]+]] @ptr_to_int(i16* %p)
59 // NOTE(eddyb) see above, the following two CHECK lines should ideally be this:
60 // %2 = ptrtoint i16* %p to [[USIZE]]
61 // store [[USIZE]] %2, [[USIZE]]* %0
62 // CHECK: %2 = bitcast [[USIZE]]* %0 to i16**
63 // CHECK-NEXT: store i16* %p, i16** %2
65 // CHECK-NEXT: %3 = load [[USIZE]], [[USIZE]]* %0
66 // CHECK: ret [[USIZE]] %3
68 pub fn ptr_to_int(p: *mut u16) -> usize {
69 unsafe { std::mem::transmute(p) }
72 // CHECK: define{{.*}}i16* @int_to_ptr([[USIZE]] %i)
74 // NOTE(eddyb) see above, the following two CHECK lines should ideally be this:
75 // %2 = inttoptr [[USIZE]] %i to i16*
76 // store i16* %2, i16** %0
77 // CHECK: %2 = bitcast i16** %0 to [[USIZE]]*
78 // CHECK-NEXT: store [[USIZE]] %i, [[USIZE]]* %2
80 // CHECK-NEXT: %3 = load i16*, i16** %0
83 pub fn int_to_ptr(i: usize) -> *mut u16 {
84 unsafe { std::mem::transmute(i) }