libbio, all cmd: consistently use BGETC/BPUTC instead of Bgetc/Bputc

Also introduce BGET2/4, BPUT2/4 as they are widely used.
Slightly improve BGETC/BPUTC implementation.
This gives ~5% CPU time improvement on go install -a -p1 std.
Before:
real		user		sys
0m23.561s	0m16.625s	0m5.848s
0m23.766s	0m16.624s	0m5.846s
0m23.742s	0m16.621s	0m5.868s
after:
0m22.999s	0m15.841s	0m5.889s
0m22.845s	0m15.808s	0m5.850s
0m22.889s	0m15.832s	0m5.848s

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/12745047

1 files changed, 29 insertions, 47 deletions

diff --git a/src/cmd/5a/lex.c b/src/cmd/5a/lex.c
index 3b537a967..c1b54e50b 100644
--- a/src/cmd/5a/lex.c
+++ b/src/cmd/5a/lex.c
@@ -485,14 +485,14 @@ void
 zname(char *n, int t, int s)
 {
 
-	Bputc(&obuf, ANAME);
-	Bputc(&obuf, t);	/* type */
-	Bputc(&obuf, s);	/* sym */
+	BPUTC(&obuf, ANAME);
+	BPUTC(&obuf, t);	/* type */
+	BPUTC(&obuf, s);	/* sym */
 	while(*n) {
-		Bputc(&obuf, *n);
+		BPUTC(&obuf, *n);
 		n++;
 	}
-	Bputc(&obuf, 0);
+	BPUTC(&obuf, 0);
 }
 
 void
@@ -503,11 +503,11 @@ zaddr(Gen *a, int s)
 	char *n;
 	Ieee e;
 
-	Bputc(&obuf, a->type);
-	Bputc(&obuf, a->reg);
-	Bputc(&obuf, s);
-	Bputc(&obuf, a->name);
-	Bputc(&obuf, 0);
+	BPUTC(&obuf, a->type);
+	BPUTC(&obuf, a->reg);
+	BPUTC(&obuf, s);
+	BPUTC(&obuf, a->name);
+	BPUTC(&obuf, 0);
 	switch(a->type) {
 	default:
 		print("unknown type %d\n", a->type);
@@ -522,45 +522,33 @@ zaddr(Gen *a, int s)
 
 	case D_REGREG:
 	case D_REGREG2:
-		Bputc(&obuf, a->offset);
+		BPUTC(&obuf, a->offset);
 		break;
 
 	case D_CONST2:
 		l = a->offset2;
-		Bputc(&obuf, l);
-		Bputc(&obuf, l>>8);
-		Bputc(&obuf, l>>16);
-		Bputc(&obuf, l>>24);
+		BPUTLE4(&obuf, l);
 		// fall through
 	case D_OREG:
 	case D_CONST:
 	case D_BRANCH:
 	case D_SHIFT:
 		l = a->offset;
-		Bputc(&obuf, l);
-		Bputc(&obuf, l>>8);
-		Bputc(&obuf, l>>16);
-		Bputc(&obuf, l>>24);
+		BPUTLE4(&obuf, l);
 		break;
 
 	case D_SCONST:
 		n = a->sval;
 		for(i=0; i<NSNAME; i++) {
-			Bputc(&obuf, *n);
+			BPUTC(&obuf, *n);
 			n++;
 		}
 		break;
 
 	case D_FCONST:
 		ieeedtod(&e, a->dval);
-		Bputc(&obuf, e.l);
-		Bputc(&obuf, e.l>>8);
-		Bputc(&obuf, e.l>>16);
-		Bputc(&obuf, e.l>>24);
-		Bputc(&obuf, e.h);
-		Bputc(&obuf, e.h>>8);
-		Bputc(&obuf, e.h>>16);
-		Bputc(&obuf, e.h>>24);
+		BPUTLE4(&obuf, e.l);
+		BPUTLE4(&obuf, e.h);
 		break;
 	}
 }
@@ -642,13 +630,10 @@ jackpot:
 			goto jackpot;
 		break;
 	}
-	Bputc(&obuf, a);
-	Bputc(&obuf, scond);
-	Bputc(&obuf, reg);
-	Bputc(&obuf, stmtline);
-	Bputc(&obuf, stmtline>>8);
-	Bputc(&obuf, stmtline>>16);
-	Bputc(&obuf, stmtline>>24);
+	BPUTC(&obuf, a);
+	BPUTC(&obuf, scond);
+	BPUTC(&obuf, reg);
+	BPUTLE4(&obuf, stmtline);
 	zaddr(g1, sf);
 	zaddr(g2, st);
 
@@ -722,12 +707,12 @@ outhist(void)
 				q = 0;
 			}
 			if(n) {
-				Bputc(&obuf, ANAME);
-				Bputc(&obuf, D_FILE);	/* type */
-				Bputc(&obuf, 1);	/* sym */
-				Bputc(&obuf, '<');
+				BPUTC(&obuf, ANAME);
+				BPUTC(&obuf, D_FILE);	/* type */
+				BPUTC(&obuf, 1);	/* sym */
+				BPUTC(&obuf, '<');
 				Bwrite(&obuf, p, n);
-				Bputc(&obuf, 0);
+				BPUTC(&obuf, 0);
 			}
 			p = q;
 			if(p == 0 && op) {
@@ -737,13 +722,10 @@ outhist(void)
 		}
 		g.offset = h->offset;
 
-		Bputc(&obuf, AHISTORY);
-		Bputc(&obuf, Always);
-		Bputc(&obuf, 0);
-		Bputc(&obuf, h->line);
-		Bputc(&obuf, h->line>>8);
-		Bputc(&obuf, h->line>>16);
-		Bputc(&obuf, h->line>>24);
+		BPUTC(&obuf, AHISTORY);
+		BPUTC(&obuf, Always);
+		BPUTC(&obuf, 0);
+		BPUTLE4(&obuf, h->line);
 		zaddr(&nullgen, 0);
 		zaddr(&g, 0);