many improvements

- fix a decode bug for C.ADDI16SP
- improve test suite (to test that bug)
- improve debugging
- clean up code

tests/check/int_comp.S

@@ -2,36 +2,75 @@
 
 #include "../helper.S"
 
-.macro CASER inst a b expected
+.macro CASER inst:req a:req b:req expected:req
     li t0, \a
     li t1, \b
     \inst t2, t0, t1
     ASSERT_EQ t2, \expected
 .endm
 
-.macro CASE_IMM inst a b expected
+.macro CASE_IMM inst:req a:req b:req expected:req
     li t0, \a
     \inst t2, t0, \b
     ASSERT_EQ t2, \expected
 .endm
 
-.macro CASE_BOTH inst insti a b expected
+.macro CASE_BOTH inst:req insti:req a:req b:req expected:req
     CASER \inst, \a, \b, \expected
     CASE_IMM \insti, \a, \b, \expected
 .endm
 
-
-.macro CASE inst a b expected
+.macro CASE inst:req a:req b:req expected:req
     CASE_BOTH \inst, \inst\()i, \a, \b, \expected
 .endm
 
+.macro WITH_SINGLE_TEST_NUMBERS macro
+    \macro a, 0
+    \macro c, 1
+    \macro d, 2
+    \macro u, 3
+    \macro e, 4
+    \macro v, 5
+    \macro f, 8
+    \macro t, 10
+    \macro g, 16
+    \macro h, 32
+    \macro i, 64
+    \macro s, 100
+    \macro j, 128
+    \macro k, 256
+    \macro l, 512
+    \macro w, 1000
+    \macro m, 1024
+    \macro n, 2047
+    \macro b, -1
+    \macro o, -2
+    \macro p, -16
+    \macro q, -1024
+    \macro r, -1000
+
+.endm
+
+.macro WITH_TWO_TEST_NUMBERS macro
+    .macro \macro\()_TMP namea:req a:req
+        .macro \macro\()_TMP_\namea nameb:req b:req
+            \macro \a, \b
+        .endm
+        
+        WITH_SINGLE_TEST_NUMBERS \macro\()_TMP_\namea
+    .endm
+
+    WITH_SINGLE_TEST_NUMBERS \macro\()_TMP
+.endm
+
 START_TEST
     # Base instructions
 
-    CASE add 10, 20, 30
-    CASE add 10, -2, 8
-    CASE add 10, 0, 10
-    CASE add 0, 0, 0
+    .macro CASE_ADD a:req, b:req
+        CASE add, \a, \b, \a + \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_ADD
 
     CASE slt 10 20 1
     CASE slt 20 10 0
@@ -52,15 +91,33 @@ START_TEST
     CASE and, -1, 40, 40
     CASE and, 0b101, 0b100, 0b100
 
+    .macro CASE_AND a:req, b:req
+        CASE and, \a, \b, \a & \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_AND
+
     CASE or, -1, 0, -1
     CASE or, -1, 40, -1
     CASE or, 0, 0, 0
     CASE or, 0b101, 0b110, 0b111
 
+    .macro CASE_OR a:req, b:req
+        CASE or, \a, \b, \a | \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_OR
+
     CASE xor, -1, 0, -1
     CASE xor, -1, -1, 0
     CASE xor 0b101, 0b100, 0b001
 
+    .macro CASE_XOR a:req, b:req
+        CASE xor, \a, \b, \a ^ \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_XOR
+
     CASE sll, 2, 1, 4
     CASE sll, 2, 20, 2097152
     CASE sll, 2, 30, 2147483648
@@ -84,6 +141,12 @@ START_TEST
     CASER sub, -1, -2, 1
     CASER sub, 0, 4294967295, 1
 
+    .macro CASE_SUB a:req, b:req
+        CASER sub, \a, \b, \a - \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_SUB
+
     CASE sra, 4, 1, 2
     CASE sra, 0, 10, 0
     CASE sra, 10, 0, 10
@@ -100,6 +163,12 @@ START_TEST
     CASER mul, -1, -1, 1
     CASER mul, 25252566, 5225225, 353909638
 
+    .macro CASE_MUL a:req, b:req
+        CASER mul, \a, \b, \a * \b
+    .endm
+
+    WITH_TWO_TEST_NUMBERS CASE_MUL
+
     CASER mulh 4, 4, 0
     CASER mulh, -1, -1, 0
     CASER mulh, 25252566, 5225225, 30722