WIP: fix endianness of non-native 128-bit integers

Author: antoyo

src/int.rs

@@ -8,6 +8,7 @@ use gccjit::{ComparisonOp, FunctionType, RValue, ToRValue, Type, UnaryOp, Binary
 use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
 use rustc_codegen_ssa::traits::{BackendTypes, BaseTypeMethods, BuilderMethods, OverflowOp};
 use rustc_middle::ty::Ty;
+use rustc_target::abi::Endian;
 
 use crate::builder::ToGccComp;
 use crate::{builder::Builder, common::{SignType, TypeReflection}, context::CodegenCx};
@@ -792,10 +793,16 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     }
 
     fn from_low_high(&self, typ: Type<'gcc>, low: i64, high: i64) -> RValue<'gcc> {
+        let (first, last) =
+            match self.sess().target.options.endian {
+                Endian::Little => (low, high),
+                Endian::Big => (high, low),
+            };
+
         let native_int_type = typ.dyncast_array().expect("get element type");
         let values = [
-            self.context.new_rvalue_from_long(native_int_type, low),
-            self.context.new_rvalue_from_long(native_int_type, high),
+            self.context.new_rvalue_from_long(native_int_type, first),
+            self.context.new_rvalue_from_long(native_int_type, last),
         ];
         self.context.new_array_constructor(None, typ, &values)
     }

tests/lang_tests_common.rs

@@ -74,7 +74,7 @@ pub fn main_inner(profile: Profile) {
             }
             // Test command 2: run `tempdir/x`.
             let vm_parent_dir = "/home/bouanto/Ordinateur/VirtualMachines";
-            let vm_dir = "debian-m68k-root-img/";
+            let vm_dir = "debian-m68k-root/";
             let exe_filename = exe.file_name().unwrap();
             let vm_exe_path = PathBuf::from(vm_parent_dir).join(vm_dir).join("home").join(exe_filename);
             // FIXME: panicking here makes the test pass.