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feat(v4.0.0): C@ is call-free

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One case per byte position, like C!: the cell is shifted down with a
2/ loop and masked.  It replaces the version built on LSHIFT, RSHIFT
and SWAP calls.  C@ now leaves its caller 7 return entries (was 4), and
the words above it gain with it: TYPE 6 (was 3), DUMP 4, Q.PRINT, U.
and U.R 3 (were 2).  The signed number words stay at 2: their sign
waits on the return stack.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-03 17:15:57 -04:00
co-authored by Claude Opus 5.5
parent e50cc1f73a
commit 7c5be22799
5 changed files with 142 additions and 32 deletions
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v4/tests/test_terminal.c
+32 -6
View File
@@ -15,6 +15,7 @@
* as the text between "System initialization complete." and "Goodbye!".
*
* On a node of its own, like test_pictured.c. SWAP, LSHIFT, RSHIFT and C@
* (call-free, so it no longer uses the other three)
* are assembled again here as they are in test_foundation.c.
*/
#include "v4/asm.h"
@@ -91,12 +92,37 @@ static void build(void)
HERE_(a);
O(DROP); O(DROP); O(SEMI);
/* : C@ ( baddr -- c )
* dup 3 and 3 LSHIFT SWAP 2 RSHIFT a! @ SWAP RSHIFT 255 and ; */
/* : C@ ( baddr -- c ) call-free, 5.3
* dup 2/ 2/ a! 3 and k A: word address
* if K0 -1 + if K1 -1 + if K2
* drop @ 23 FOR 2/ UNEXT 255 and ; byte 3
* K2: drop @ 15 FOR 2/ UNEXT 255 and ; byte 2
* K1: drop @ 7 FOR 2/ UNEXT 255 and ; byte 1
* K0: drop @ 255 and ; byte 0 */
w_cfetch = v4_asm_label(&as);
O(DUP); LIT(3); O(AND); LIT(3); CALL(w_lshift);
CALL(w_swap); LIT(2); CALL(w_rshift); O(BANG_A); O(FETCH_A);
CALL(w_swap); CALL(w_rshift); LIT(255); O(AND); O(SEMI);
{
v4_asm_ref f0, f1, f2;
O(DUP); O(TWO_SLASH); O(TWO_SLASH); O(BANG_A); LIT(3); O(AND);
f0 = v4_asm_branch_fwd(&as, V4_OP_IF);
LIT(-1); O(ADD); f1 = v4_asm_branch_fwd(&as, V4_OP_IF);
LIT(-1); O(ADD); f2 = v4_asm_branch_fwd(&as, V4_OP_IF);
O(DROP); O(FETCH_A); LIT(23); O(PUSH);
(void)v4_asm_label(&as);
O(TWO_SLASH); O(UNEXT);
LIT(255); O(AND); O(SEMI);
v4_asm_resolve(&as, f2, v4_asm_label(&as));
O(DROP); O(FETCH_A); LIT(15); O(PUSH);
(void)v4_asm_label(&as);
O(TWO_SLASH); O(UNEXT);
LIT(255); O(AND); O(SEMI);
v4_asm_resolve(&as, f1, v4_asm_label(&as));
O(DROP); O(FETCH_A); LIT(7); O(PUSH);
(void)v4_asm_label(&as);
O(TWO_SLASH); O(UNEXT);
LIT(255); O(AND); O(SEMI);
v4_asm_resolve(&as, f0, v4_asm_label(&as));
O(DROP); O(FETCH_A); LIT(255); O(AND); O(SEMI);
}
/* ---- terminal output, 5.10 ---- */
@@ -272,7 +298,7 @@ int main(void)
CHECK(dh >= 7 && rh >= 7, "EMIT leaves room");
headroom("CR", w_cr, 0, 0, 0, "\n", 1, &dh, &rh);
headroom("TYPE", w_type, 2, STR_BADDR + 17, 9, text + 17, 9, &dh, &rh);
CHECK(dh >= 2 && rh >= 2, "TYPE leaves room");
CHECK(dh >= 5 && rh >= 6, "TYPE leaves room");
}
CHECK(v4_node_guards_intact(&n), "guards intact");