Fortify codegen test.

Author: cjgillot

tests/codegen/inline-hint.rs

@@ -1,7 +1,7 @@
 // Checks that closures, constructors, and shims except
 // for a drop glue receive inline hint by default.
 //
-// compile-flags: -Cno-prepopulate-passes -Csymbol-mangling-version=v0 -Zinline-mir=no
+// compile-flags: -Cno-prepopulate-passes -Csymbol-mangling-version=v0 -Zmir-opt-level=0
 #![crate_type = "lib"]
 
 pub fn f() {

tests/codegen/simd/simd-wide-sum.rs

@@ -52,8 +52,8 @@ pub fn wider_reduce_iter(x: Simd<u8, N>) -> u16 {
 #[no_mangle]
 // CHECK-LABEL: @wider_reduce_into_iter
 pub fn wider_reduce_into_iter(x: Simd<u8, N>) -> u16 {
-    // FIXME: It would be nice if this was exactly the same as the above tests,
-    // but at the time of writing this comment, that didn't happen on LLVM main.
-    // CHECK: call i16 @llvm.vector.reduce.add
+    // CHECK: zext <16 x i8>
+    // CHECK-SAME: to <16 x i16>
+    // CHECK: call i16 @llvm.vector.reduce.add.v16i16(<16 x i16>
     x.to_array().into_iter().map(u16::from).sum()
 }

tests/codegen/swap-large-types.rs

@@ -16,7 +16,9 @@ type KeccakBuffer = [[u64; 5]; 5];
 // CHECK-LABEL: @swap_basic
 #[no_mangle]
 pub fn swap_basic(x: &mut KeccakBuffer, y: &mut KeccakBuffer) {
-// CHECK: alloca [5 x [5 x i64]]
+// CHECK-NOT: alloca [5 x [5 x i64]]
+// CHECK: tail call void @llvm.memcpy
+// CHECK-NOT: tail call void @llvm.memcpy
 
     // SAFETY: exclusive references are always valid to read/write,
     // are non-overlapping, and nothing here panics so it's drop-safe.