os

commit 09b26a0a50456b5eaf779fcc1d1322eef10732ab
parent ec816a9977f76e037f2b0c981790c82b1ec631b0
Author: erai <erai@omiltem.net>
Date:   Sun,  9 Feb 2025 04:59:07 +0000

loadb storeb don't need rex

Diffstat:
M
as.om
 | 
3
+++
M
cc0.c
 | 
22
++++++++++++++++++----

2 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/as.om b/as.om
@@ -1110,6 +1110,9 @@ func as_rex(a: *assembler, op: int, r: int, i: int, b: int) {
 	w = 0x08;
 	if op == OP_LOADB || op == OP_STOREB {
 		w = 0;
+		if r < 8 && i < 8 && b < 8 {
+			return;
+		}
 	}
 	as_emit(a, 0x40 + w + ((r >> 1) & 4) + ((i >> 2) & 2) + ((b >> 3) & 1));
 }
diff --git a/cc0.c b/cc0.c
@@ -1714,6 +1714,8 @@ u zas_rex(u va, u vop, u vr, u vi, u vb) {
 	u v8 = 0;
 	u v9 = 0;
 	u v10 = 0;
+	u v11 = 0;
+	u v12 = 0;
 	if (!*(u*)(va + 48)) goto b1;
 	return 0;
 b1:	vw = 8;
@@ -1721,11 +1723,23 @@ b1:	vw = 8;
 	v6 = 1;
 b10:	if (!v6) goto b4;
 	vw = 0;
-b4:	v7 = (u)zas_emit;
-	v8 = va;
-	v9 = 64 + vw + (vr >> 1 & 4) + (vi >> 2 & 2) + (vb >> 3 & 1);
-	v10 = ((u(*)())v7)(v8, v9);
+	if ((s)vr >= (s)8) goto b16;
+	if ((s)vi >= (s)8) goto b20;
+	if ((s)vb >= (s)8) goto b20;
+	v8 = 1;
+b22:	if (!v8) goto b16;
+	v7 = 1;
+b18:	if (!v7) goto b4;
 	return 0;
+b4:	v9 = (u)zas_emit;
+	v10 = va;
+	v11 = 64 + vw + (vr >> 1 & 4) + (vi >> 2 & 2) + (vb >> 3 & 1);
+	v12 = ((u(*)())v9)(v10, v11);
+	return 0;
+b16:	v7 = 0;
+	goto b18;
+b20:	v8 = 0;
+	goto b22;
 b8:	if (vop != 136) goto b11;
 	v6 = 1;
 	goto b10;