9aa9a846b6
LLVM can usually optimize these away, but especially for things like transmutes of newtypes it's silly to generate the `alloc`+`store`+`load` at all when it's actually a nop at LLVM level.
84 lines
2.5 KiB
Rust
84 lines
2.5 KiB
Rust
//
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// compile-flags: -C no-prepopulate-passes
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#![crate_type = "lib"]
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#![allow(non_camel_case_types)]
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#![feature(repr_simd, platform_intrinsics)]
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#![feature(inline_const)]
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#[repr(simd)]
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#[derive(Copy, Clone)]
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pub struct S<const N: usize>([f32; N]);
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#[repr(simd)]
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#[derive(Copy, Clone)]
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pub struct T([f32; 4]);
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#[repr(simd)]
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#[derive(Copy, Clone)]
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pub struct U(f32, f32, f32, f32);
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// CHECK-LABEL: @array_align(
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#[no_mangle]
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pub fn array_align() -> usize {
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// CHECK: ret [[USIZE:i[0-9]+]] [[ARRAY_ALIGN:[0-9]+]]
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const { std::mem::align_of::<f32>() }
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}
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// CHECK-LABEL: @vector_align(
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#[no_mangle]
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pub fn vector_align() -> usize {
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// CHECK: ret [[USIZE]] [[VECTOR_ALIGN:[0-9]+]]
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const { std::mem::align_of::<U>() }
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}
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// CHECK-LABEL: @build_array_s
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#[no_mangle]
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pub fn build_array_s(x: [f32; 4]) -> S<4> {
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// CHECK: call void @llvm.memcpy.{{.+}}({{.*}} align [[VECTOR_ALIGN]] {{.*}} align [[ARRAY_ALIGN]] {{.*}}, [[USIZE]] 16, i1 false)
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S::<4>(x)
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}
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// CHECK-LABEL: @build_array_transmute_s
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#[no_mangle]
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pub fn build_array_transmute_s(x: [f32; 4]) -> S<4> {
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// CHECK: %[[VAL:.+]] = load <4 x float>, {{ptr %x|.+>\* %.+}}, align [[ARRAY_ALIGN]]
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// CHECK: store <4 x float> %[[VAL:.+]], {{ptr %0|.+>\* %.+}}, align [[VECTOR_ALIGN]]
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unsafe { std::mem::transmute(x) }
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}
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// CHECK-LABEL: @build_array_t
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#[no_mangle]
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pub fn build_array_t(x: [f32; 4]) -> T {
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// CHECK: call void @llvm.memcpy.{{.+}}({{.*}} align [[VECTOR_ALIGN]] {{.*}} align [[ARRAY_ALIGN]] {{.*}}, [[USIZE]] 16, i1 false)
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T(x)
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}
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// CHECK-LABEL: @build_array_transmute_t
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#[no_mangle]
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pub fn build_array_transmute_t(x: [f32; 4]) -> T {
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// CHECK: %[[VAL:.+]] = load <4 x float>, {{ptr %x|.+>\* %.+}}, align [[ARRAY_ALIGN]]
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// CHECK: store <4 x float> %[[VAL:.+]], {{ptr %0|.+>\* %.+}}, align [[VECTOR_ALIGN]]
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unsafe { std::mem::transmute(x) }
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}
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// CHECK-LABEL: @build_array_u
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#[no_mangle]
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pub fn build_array_u(x: [f32; 4]) -> U {
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// CHECK: store float %a, {{.+}}, align [[VECTOR_ALIGN]]
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// CHECK: store float %b, {{.+}}, align [[ARRAY_ALIGN]]
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// CHECK: store float %c, {{.+}}, align
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// CHECK: store float %d, {{.+}}, align [[ARRAY_ALIGN]]
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let [a, b, c, d] = x;
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U(a, b, c, d)
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}
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// CHECK-LABEL: @build_array_transmute_u
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#[no_mangle]
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pub fn build_array_transmute_u(x: [f32; 4]) -> U {
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// CHECK: %[[VAL:.+]] = load <4 x float>, {{ptr %x|.+>\* %.+}}, align [[ARRAY_ALIGN]]
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// CHECK: store <4 x float> %[[VAL:.+]], {{ptr %0|.+>\* %.+}}, align [[VECTOR_ALIGN]]
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unsafe { std::mem::transmute(x) }
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}
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