Lays groundword for Rv64i extension

Some base files had to be modified to support 64-bit architecture
as well as the Makefile to load 64-bit words into memory

bench/tests/op/add.s

@@ -1,4 +1,4 @@
-# expected: dead0000, dead0001, 00000000
+# expected: ffffffffdead0000, ffffffffdead0001, 0000000000000000
     .text
 _start:
     lui x2, 0xdead0

bench/tests/op/addi.s

@@ -1,4 +1,4 @@
-# expected: dead0000, dead0001, fffff800, ffffffff, 00000000
+# expected: FFFFFFFFdead0000, FFFFFFFFdead0001, fffffffffffff800, ffffffffffffffff, 0000000000000000
     .text
 _start:
     lui x2, 0xdead0

bench/tests/op/lb.s

@@ -1,4 +1,4 @@
-# expected: FFFFFFFB, FFFFFFFB
+# expected: FFFFFFFFFFFFFFFB, FFFFFFFFFFFFFFFB
     .text
 _start:
     addi x1, x0, 0x0FB

bench/tests/op/lh.s

@@ -1,4 +1,4 @@
-# expected: FFFFF1BC, FFFFF1BC
+# expected: FFFFFFFFFFFFF1BC, FFFFFFFFFFFFF1BC
     .text
 _start:
     lui x1, 0xF

bench/tests/op/lui.s

@@ -1,4 +1,4 @@
-# expected: 00000000,FFFFF000,12345000
+# expected: 00000000,FFFFFFFFFFFFF000,12345000
 	.text
 
 	lui x31, 0       #Test chargement d'une valeur nulle

bench/tests/op/or.s

@@ -1,4 +1,4 @@
-# expected: 000001FF, FFFFFFFF
+# expected: 000001FF, FFFFFFFFFFFFFFFF
     .text
 _start:
     addi x1, x0, 0x100

bench/tests/op/ori.s

@@ -1,4 +1,4 @@
-# expected: 000001FF, FFFFFFFF
+# expected: 00000000000001FF, FFFFFFFFFFFFFFFF
     .text
 _start:
     addi x1, x0, 0x100

bench/tests/op/sll.s

@@ -10,4 +10,5 @@ _start:
     sll x31, x1, x2
 
     addi x1, x0, 0x0F0
+    addi x2, x0, 63
     sll x31, x1, x2

bench/tests/op/slli.s

@@ -8,4 +8,4 @@ _start:
     slli x31, x1, 31
 
     addi x1, x0, 0x0F0
-    slli x31, x1, 31
+    slli x31, x1, 63

bench/tests/op/sra.s

@@ -1,4 +1,4 @@
-# expected: 000000FF, FFFFFFFF, 00000000
+# expected: 000000FF, FFFFFFFFFFFFFFFF, 00000000
     .text
 _start:
     addi x1, x0, 0x3FC

bench/tests/op/srai.s

@@ -1,4 +1,4 @@
-# expected: 000000FF, FFFFFFFF, 00000000
+# expected: 000000FF, FFFFFFFFFFFFFFFF, 00000000
     .text
 _start:
     addi x1, x0, 0x3FC

bench/tests/op/srl.s

@@ -5,7 +5,7 @@ _start:
     addi x2, x0, 2
     srl x31, x1, x2
 
-    lui x1, 0xA0000
+    li x1, 0x00000000A0000000
     addi x2, x0, 31
     srl x31, x1, x2
 

bench/tests/op/srli.s

@@ -4,7 +4,8 @@ _start:
     addi x1, x0, 0x3FC
     srli x31, x1, 2
 
-    lui x1, 0xA0000
+    #lui x1, 0xA0000
+    li x1, 0x00000000A0000000
     srli x31, x1, 31
 
     lui x1, 0x0A000

bench/tests/op/sub.s

@@ -1,4 +1,4 @@
-# expected: 00000000, 00000001, FFFFFFFF, 00000008
+# expected: 00000000, 00000001, FFFFFFFFFFFFFFFF, 00000008
     .text
 _start:
     # Sub equal numbers