qbe

commit 3c3175ca73914e299589b2e38692cd01b349d3d5
parent ad064eae9ae1d39e450ab1b78622c9bae473ae42
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Wed, 19 Aug 2015 13:59:23 -0400

remove dead code from rega

An invariant is that all registers allocated at some point
have a hint.  This makes the code removed by this commit
dead because of the if condition testing for empty hints.

Diffstat:
M
lisc/rega.c
 | 
15
---------------

1 file changed, 0 insertions(+), 15 deletions(-)
diff --git a/lisc/rega.c b/lisc/rega.c
@@ -307,21 +307,6 @@ rega(Fn *fn)
 		b = fn->rpo[n];
 		cur.n = 0;
 		cur.b = (Bits){{0}};
-		b1 = b;
-		if (b->s1 && b1->loop <= b->s1->loop)
-			b1 = b->s1;
-		if (b->s2 && b1->loop <= b->s2->loop)
-			b1 = b->s2;
-		/* try to reuse the register
-		 * assignment of the most frequent
-		 * successor
-		 */
-		if (b1 != b)
-			for (t=Tmp0; t<fn->ntmp; t++)
-				if (tmp[t].hint == -1)
-				if (BGET(b->out, t))
-				if ((r = rfind(&beg[b1->id], t)) != -1)
-					radd(&cur, t, r);
 		for (x=0; x<2; x++)
 			for (t=Tmp0; t<fn->ntmp; t++)
 				if (BGET(b->out, t))