Function arguments should never get promoted

Author: oli-obk

src/librustc_mir/transform/qualify_consts.rs

@@ -639,7 +639,7 @@ impl<'a, 'tcx> Checker<'a, 'tcx> {
                             per_local.insert(local);
                         }
                     }
-                    cx.per_local[IsNotPromotable].insert(local);
+                    cx.per_local[IsNotConst].insert(local);
                 }
 
                 LocalKind::Var if mode == Mode::Fn => {

src/test/ui/consts/const_arg_wrapper.rs

@@ -0,0 +1,10 @@
+#[cfg(target_arch = "x86")]
+use std::arch::x86::*;
+#[cfg(target_arch = "x86_64")]
+use std::arch::x86_64::*;
+
+unsafe fn pclmul(a: __m128i, b: __m128i, imm8: i32) -> __m128i {
+    _mm_clmulepi64_si128(a, b, imm8) //~ ERROR argument 3 is required to be a constant
+}
+
+fn main() {}

src/test/ui/consts/const_arg_wrapper.stderr

@@ -0,0 +1,8 @@
+error: argument 3 is required to be a constant
+  --> $DIR/const_arg_wrapper.rs:7:5
+   |
+LL |     _mm_clmulepi64_si128(a, b, imm8)
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+