From 74546bd9854d993cb111a5329648609e26331cea Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Thu, 26 Oct 1989 15:41:38 +0000
Subject: [PATCH] Added a command to kill a register

---
 h/cgg_cg.h               | 1 +
 mach/proto/ncg/codegen.c | 3 +++
 util/ncgg/output.c       | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/h/cgg_cg.h b/h/cgg_cg.h
index 266d88b30..c6717da3a 100644
--- a/h/cgg_cg.h
+++ b/h/cgg_cg.h
@@ -37,6 +37,7 @@
 #define DO_DLINE	21
 #define DO_SETCC	22
 #define DO_TOSTACK	23
+#define DO_KILLREG	24
 
 #ifndef MAXATT
 #define MAXATT TOKENSIZE
diff --git a/mach/proto/ncg/codegen.c b/mach/proto/ncg/codegen.c
index 06c7e69e7..806faeb71 100644
--- a/mach/proto/ncg/codegen.c
+++ b/mach/proto/ncg/codegen.c
@@ -482,12 +482,14 @@ normalfailed:	if (stackpad!=tokpatlen) {
 			rp->r_contents.t_token=0;
 	break;
     }
+    case DO_KILLREG:
     case DO_RREMOVE: {	/* register remove */
 	register i;
 	int nodeno;
 	token_p tp;
 	tkdef_p tdp;
 	result_t result;
+	int dokill = (codep[-1] & 037) == DO_KILLREG;
 
 	DEBUG("RREMOVE");
 	getint(nodeno,codep);
@@ -495,6 +497,7 @@ normalfailed:	if (stackpad!=tokpatlen) {
 	if (result.e_typ!=EV_REG)
 		break;
 	if ( in_stack(result.e_v.e_reg) ) BROKE() ; /* Check aside-stack */
+	if (dokill) machregs[result.e_v.e_reg].r_contents.t_token = 0;
 	for (tp= &fakestack[stackheight-tokpatlen-1];tp>=&fakestack[0];tp--)
 		if (tp->t_token==-1) {
 			if(tp->t_att[0].ar==result.e_v.e_reg)
diff --git a/util/ncgg/output.c b/util/ncgg/output.c
index 560c4bb46..a49e3b535 100644
--- a/util/ncgg/output.c
+++ b/util/ncgg/output.c
@@ -716,7 +716,7 @@ varinfo *kills,*allocates,*generates,*yields,*leaving;
 			code53(DO_REMOVE,0);
 			codeint(vp->vi_int[0]);
 		} else {
-			code8(DO_RREMOVE);
+			code8(DO_KILLREG);
 			codeint(-vp->vi_int[0] - 1);
 		}
 		codenl();
-- 
2.34.1