From: ceriel <none@none>
Date: Wed, 22 Jun 1988 13:47:57 +0000 (+0000)
Subject: Added some patterns to evaluate constant shifts
X-Git-Tag: release-5-5~3170
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=ec40d28c250d41a96e5f4e58cdb3decda5a4481a;p=ack.git

Added some patterns to evaluate constant shifts
---

diff --git a/util/opt/patterns b/util/opt/patterns
index f9397d703..e05f92821 100644
--- a/util/opt/patterns
+++ b/util/opt/patterns
@@ -179,6 +179,14 @@ ldc mli $1==1 && $2==2*w:
 loc mlu $1==1 && $2==w:
 ldc mlu $1==1 && $2==2*w:
 loc sbi $1==1 && $2==w: dec
+loc loc sli $3==w:	loc ($1 << $2)
+loc loc slu $3==w:	loc ($1 << $2)
+ldc loc sli $3==2*w:	ldc ($1 << $2)
+ldc loc slu $3==2*w:	ldc ($1 << $2)
+loc loc sri $3==w:	loc ($1 >> $2)
+loc loc sru $1 >= 0 && $3==w:	loc ($1 >> $2)
+ldc loc sri $3==2*w:	ldc ($1 >> $2)
+ldc loc sru $1 >= 0 && $3==2*w:	ldc ($1 >> $2)
 loc loe mlu $3==w:      loe $2  loc $1  mlu w
 loc lol mlu $3==w:      lol $2  loc $1  mlu w
 ldc lde mlu $3==2*w:    lde $2  ldc $1  mlu 2*w