From d1f048bc9c8eacc5fb34ce39346de8f5388a201b Mon Sep 17 00:00:00 2001
From: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date: Sat, 24 Oct 2015 20:53:29 -0400
Subject: don't share mems containing temporaries

This can cause trouble in register allocation when
these temporaries get replaced by registers.  On
the other hand, offsetted slots and constants
can safely be shared.
---
 lisc/isel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisc/isel.c b/lisc/isel.c
index 1560d6d..6dc28ea 100644
--- a/lisc/isel.c
+++ b/lisc/isel.c
@@ -141,7 +141,9 @@ sel(Ins i, ANum *an, Fn *fn)
 				vgrow(&fn->mem, ++fn->nmem);
 				fn->mem[fn->nmem-1] = a;
 				i.arg[0] = MEM(fn->nmem-1);
-				an[r0.val].mem = i.arg[0];
+				if (rtype(a.base) != RTmp)
+				if (req(a.index, R))
+					an[r0.val].mem = i.arg[0];
 			} else
 				i.arg[0] = r1;
 		}
-- 
cgit 1.4.1