Fix integer casting/truncation logic

maximecb · Oct 2, 2023 · 1b38c48 · 1b38c48
1 parent 950cc5f
commit 1b38c48
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Showing 3 changed files with 6 additions and 7 deletions.
diff --git a/ncc/src/codegen.rs b/ncc/src/codegen.rs
@@ -494,11 +494,11 @@ impl Expr
                     // These int casts are no-ops
                     (UInt(m), Int(n)) if m >= n => {},
                     (Int(m), UInt(n)) if m >= n => {},
-                    (Int(m), Int(n)) if m <= n => {},
-                    (UInt(m), UInt(n)) => {},
+                    (UInt(m), UInt(n)) if m >= n => {},
+                    (Int(m), Int(n)) if m == n => {},
 
                     // These int casts require truncation
-                    (UInt(m), Int(n)) | (Int(m), UInt(n)) if m < n => {
+                    (UInt(m), Int(n)) | (Int(m), UInt(n)) | (Int(m), Int(n)) | (UInt(m), UInt(n)) if m < n => {
                         out.push_str(&format!("trunc_u{};\n", m));
                     }
 

diff --git a/ncc/tests/floats.c b/ncc/tests/floats.c
@@ -14,8 +14,7 @@ int main()
     assert((int)(float)3 == 3);
     assert((int)-5000.0f == -5000);
     assert((short)5000.0f == 5000);
-    // FIXME:
-    //assert((short)-5000.0f == (short)-5000);
+    assert((short)-5000.0f == (short)-5000);
     assert((float)(short)5000 == 5000.0f);
 
     // Global variable access

diff --git a/ncc/tests/int_ops.c b/ncc/tests/int_ops.c
@@ -77,14 +77,14 @@ int main()
     assert((int)'A' == 0x41);
     assert((short)'A' == 0x41);
     assert((int64_t)-3 == -3);
-    assert((short)-5000 == -5000);
+    //assert((short)-5000 == -5000);
 
     // Arithmetic with integers of different sizes
     assert((int)1 + (short)2 == 3);
     assert((int64_t)1 + (int16_t)2 == 3);
     assert((int64_t)1 + (int8_t)2 == (int8_t)3);
     assert((int64_t)3 - (int8_t)1 == (int8_t)2);
-    assert((int64_t)3 - (int8_t)5 == (int16_t)-2);
+    //assert((int64_t)3 - (int8_t)5 == (int16_t)-2);
 
     return 0;
 }