Auto merge of #83637 - bjorn3:sync_cg_clif-2021-03-29, r=bjorn3

Sync rustc_codegen_cranelift

The main highlight of this sync is support for cross-compiling to Windows using MinGW. Native compilation with MinGW would also work I think, but using the MSVC toolchain is not yet supported as PE TLS is not yet implemented. Another nice improvement is that crate metadata is now loaded using mmap instead of by reading files. This improves compilation time a bit.

r? `@ghost`

`@rustbot` label +A-codegen +A-cranelift +T-compiler

1 files changed, 3 insertions, 5 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/num.rs b/compiler/rustc_codegen_cranelift/src/num.rs
index da49e1c6c91..2ebf30da2d8 100644
--- a/compiler/rustc_codegen_cranelift/src/num.rs
+++ b/compiler/rustc_codegen_cranelift/src/num.rs
@@ -166,13 +166,11 @@ pub(crate) fn codegen_int_binop<'tcx>(
         BinOp::Shl => {
             let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
             let actual_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
-            let actual_shift = clif_intcast(fx, actual_shift, types::I8, false);
             fx.bcx.ins().ishl(lhs, actual_shift)
         }
         BinOp::Shr => {
             let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
             let actual_shift = fx.bcx.ins().band_imm(rhs, i64::from(lhs_ty.bits() - 1));
-            let actual_shift = clif_intcast(fx, actual_shift, types::I8, false);
             if signed {
                 fx.bcx.ins().sshr(lhs, actual_shift)
             } else {
@@ -387,7 +385,7 @@ pub(crate) fn codegen_ptr_binop<'tcx>(
                 let lhs = in_lhs.load_scalar(fx);
                 let rhs = in_rhs.load_scalar(fx);
 
-                return codegen_compare_bin_op(fx, bin_op, false, lhs, rhs);
+                codegen_compare_bin_op(fx, bin_op, false, lhs, rhs)
             }
             BinOp::Offset => {
                 let pointee_ty = in_lhs.layout().ty.builtin_deref(true).unwrap().ty;
@@ -396,10 +394,10 @@ pub(crate) fn codegen_ptr_binop<'tcx>(
                 let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
                 let base_val = base.load_scalar(fx);
                 let res = fx.bcx.ins().iadd(base_val, ptr_diff);
-                return CValue::by_val(res, base.layout());
+                CValue::by_val(res, base.layout())
             }
             _ => unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs, in_rhs),
-        };
+        }
     } else {
         let (lhs_ptr, lhs_extra) = in_lhs.load_scalar_pair(fx);
         let (rhs_ptr, rhs_extra) = in_rhs.load_scalar_pair(fx);