tests/codegen/adjustments.rs

   1 // compile-flags: -C no-prepopulate-passes -Copt-level=0
   2
   3 #![crate_type = "lib"]
   4
   5 // Hack to get the correct size for the length part in slices
   6 // CHECK: @helper([[USIZE:i[0-9]+]] %_1)
   7 #[no_mangle]
   8 pub fn helper(_: usize) {
   9 }
  10
  11 // CHECK-LABEL: @no_op_slice_adjustment
  12 #[no_mangle]
  13 pub fn no_op_slice_adjustment(x: &[u8]) -> &[u8] {
  14     // We used to generate an extra alloca and memcpy for the block's trailing expression value, so
  15     // check that we copy directly to the return value slot
  16 // CHECK: %0 = insertvalue { {{\[0 x i8\]\*|ptr}}, [[USIZE]] } poison, {{\[0 x i8\]\*|ptr}} %x.0, 0
  17 // CHECK: %1 = insertvalue { {{\[0 x i8\]\*|ptr}}, [[USIZE]] } %0, [[USIZE]] %x.1, 1
  18 // CHECK: ret { {{\[0 x i8\]\*|ptr}}, [[USIZE]] } %1
  19     { x }
  20 }
  21
  22 // CHECK-LABEL: @no_op_slice_adjustment2
  23 #[no_mangle]
  24 pub fn no_op_slice_adjustment2(x: &[u8]) -> &[u8] {
  25     // We used to generate an extra alloca and memcpy for the function's return value, so check
  26     // that there's no memcpy (the slice is written to sret_slot element-wise)
  27 // CHECK-NOT: call void @llvm.memcpy.
  28     no_op_slice_adjustment(x)
  29 }