qbe

commit 1abed68cc3b14606d83d8b0ad7d2b5855c8801df
parent fd31290dd37cfd8f7ba765eb330d719bafba42f0
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Thu, 20 Aug 2015 11:56:48 -0400

change cmp $0, %reg, to test %reg, %reg

Diffstat:
M
lisc/emit.c
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/lisc/emit.c b/lisc/emit.c
@@ -261,6 +261,11 @@ eins(Ins i, Fn *fn, FILE *f)
 		break;
 	case OXCmpw:
 	case OXCmpl:
+		if (rtype(i.arg[1]) == RTmp && req(i.arg[0], CON_Z)) {
+			eop("test", i.arg[1], i.arg[1], fn, f);
+			break;
+		}
+		/* fall through */
 	case OXTestw:
 	case OXTestl:
 		eop(otoa[i.op], i.arg[0], i.arg[1], fn, f);