scc

commit 732711fe948bca7542f04347fa6261c85f56fe1e
parent d229239629cca5886993eeeca0359d5c5f31ce91
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed,  3 Nov 2021 08:29:00 +0100

cc2: Differentiate between variable and machine register

The actions performed for a register variable are different to
the actions for a machine register. For this reason is  needed
a way to differentiate between them, otherwise we can  confuse
integer constants and symbol pointers (the u value of  machine
registers and register variables).

Diffstat:
M
src/cmd/cc/cc2/cc2.h
 | 
1
+
M
src/cmd/cc/cc2/code.c
 | 
6
++----

2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/src/cmd/cc/cc2/cc2.h b/src/cmd/cc/cc2/cc2.h
@@ -59,6 +59,7 @@ enum op {
 	OTMP     = 'N',
 	OAUTO    = 'A',
 	OREG     = 'R',
+	OMREG    = 'G',
 	OCONST   = '#',
 	OSTRING  = '"',
 	OLOAD    = 'D',
diff --git a/src/cmd/cc/cc2/code.c b/src/cmd/cc/cc2/code.c
@@ -34,10 +34,7 @@ addr(Node *np, Addr *addr)
 	Symbol *sym;
 
 	switch (np->op) {
-	case OREG:
-		/* TODO:
-		 * At this moment this op is used also for register variables
-		 */
+	case OMREG:
 		addr->kind = SREG;
 		addr->u.reg = np->u.reg;
 		break;
@@ -46,6 +43,7 @@ addr(Node *np, Addr *addr)
 		/* TODO: Add support for more type of constants */
 		addr->u.i = np->u.i;
 		break;
+	case OREG:
 	case OTMP:
 	case OLABEL:
 	case OAUTO: