shithub: femtolisp

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ref: 38ab710df8704dc44dc3274ce4e7d5037cd6c7ef
parent: 15306c74c7f0101c4c367a220f83911a25ff3e2e
author: Sigrid Solveig Haflínudóttir <[email protected]>
date: Thu Nov 21 18:36:03 EST 2024

computed gotos: use direct label addresses instead of offsets

--- a/flisp.c
+++ b/flisp.c
@@ -895,9 +895,9 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wpedantic"
 #define OP(x) op_##x:
-#define NEXT_OP goto *((uint8_t*)&&op_OP_LOADA0 + ops[op = *ip++])
-#define GOTO_OP_OFFSET(op) [op] = (int)((uint8_t*)&&op_##op - (uint8_t*)&&op_OP_LOADA0)
-	static const int ops[] = {
+#define NEXT_OP goto *ops[op = *ip++]
+#define GOTO_OP_OFFSET(op) [op] = &&op_##op
+	static const void *ops[] = {
 		GOTO_OP_OFFSET(OP_LOADA0),
 		GOTO_OP_OFFSET(OP_LOADA1),
 		GOTO_OP_OFFSET(OP_LOADV),
@@ -1074,7 +1074,7 @@
 						default:
 							op = i;
 #if defined(COMPUTED_GOTO)
-							goto *((uint8_t*)&&op_OP_LOADA0 + ops[i]);
+							goto *ops[i];
 #else
 							continue;
 #endif