Revert "Assume slice len is bounded by allocation size"

https://github.com/rust-lang/rust/pull/77023#issuecomment-703987379
suggests that the original PR introduced a significant perf regression.

This reverts commit e44784b8750016a695361c990024750e037d8f9f / #77023.

1 files changed, 0 insertions, 24 deletions

diff --git a/src/test/codegen/len-is-bounded.rs b/src/test/codegen/len-is-bounded.rs
deleted file mode 100644
index bb74fc3b275..00000000000
--- a/src/test/codegen/len-is-bounded.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-// min-llvm-version: 11.0
-// compile-flags: -O -C panic=abort
-#![crate_type = "lib"]
-
-#[no_mangle]
-pub fn len_range(a: &[u8], b: &[u8]) -> usize {
-    // CHECK-NOT: panic
-    a.len().checked_add(b.len()).unwrap()
-}
-
-#[no_mangle]
-pub fn len_range_on_non_byte(a: &[u16], b: &[u16]) -> usize {
-    // CHECK-NOT: panic
-    a.len().checked_add(b.len()).unwrap()
-}
-
-pub struct Zst;
-
-#[no_mangle]
-pub fn zst_range(a: &[Zst], b: &[Zst]) -> usize {
-    // Zsts may be arbitrarily large.
-    // CHECK: panic
-    a.len().checked_add(b.len()).unwrap()
-}