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[v2,1/5] unssa: do not try to update liveness

Message ID 20161212152901.24948-2-luc.vanoostenryck@gmail.com (mailing list archive)
State Mainlined, archived
Headers show

Commit Message

Luc Van Oostenryck Dec. 12, 2016, 3:28 p.m. UTC 
The unSSA step used to try to maintain the liveness info
while creating the copies but this can't be done so simply
(what is updated is only the liveness for the current bb
while it needs to be done for all concerned bbs).

If/when liveness is needed after this step, it need to be
redone by calling track_pseudo_liveness().

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 unssa.c | 3 ---
 1 file changed, 3 deletions(-)
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Patch

diff --git a/unssa.c b/unssa.c
index 382095d7..85b1388d 100644
--- a/unssa.c
+++ b/unssa.c
@@ -49,9 +49,6 @@  static void replace_phi_node(struct instruction *phi)
 	tmp->ident = phi->target->ident;
 	tmp->def = NULL;		// defined by all the phisrc
 	
-	// update the current liveness
-	remove_pseudo(&phi->bb->needs, phi->target);
-	add_pseudo(&phi->bb->needs, tmp);
 	track_phi_uses(phi);
 
 	phi->opcode = OP_COPY;