qbe

commit 614130e4311b4eab4f0cfb61d17b2a473033d85d
parent dfede22dcdbf9dd1aa24aecf583bd94dda2e1bfa
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Tue, 27 Oct 2015 13:40:15 -0400

remove liveness heuristic in fillphi()

Diffstat:
M
lisc/ssa.c
 | 
8
--------

1 file changed, 0 insertions(+), 8 deletions(-)
diff --git a/lisc/ssa.c b/lisc/ssa.c
@@ -105,7 +105,6 @@ phirepr(Tmp *tmp, int t)
 }
 
 /* fill union find data for phi classes
- * requires live
  */
 void
 fillphi(Fn *fn)
@@ -128,13 +127,6 @@ fillphi(Fn *fn)
 				if (rtype(p->arg[a]) != RTmp)
 					continue;
 				ta = p->arg[a].val;
-				if (BGET(b->in, ta))
-					/* do not merge the
-					 * classes of phi args
-					 * that outlive the phi
-					 * node
-					 */
-					continue;
 				ta = phirepr(tmp, ta);
 				tmp[ta].phi = t;
 			}