From 6af87cb77bf64e36ec3324a6cebfb07d4085c99f Mon Sep 17 00:00:00 2001
From: frief <frief@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Sun, 25 May 2003 16:16:08 +0000
Subject: [PATCH] added rules 244.x, 245.x. Although they pass the regression
 tests I'm not brave enough to enable 245.b, 245.c. Probably they can't be
 applied safely from a peephole point of view.

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@2647 4a8a32a2-be11-0410-ad9d-d568d2c75423
---
 src/mcs51/peeph.def | 96 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/src/mcs51/peeph.def b/src/mcs51/peeph.def
index 7e404ed0..2767ea86 100644
--- a/src/mcs51/peeph.def
+++ b/src/mcs51/peeph.def
@@ -2423,3 +2423,99 @@ replace {
 %3:
         sjmp    %5      
 } if labelInRange
+
+// applies to f.e. simplefloat.c (saving 1 cycle)
+replace {
+	mov	r%1,dpl
+	mov	a,r%1
+} by {
+        ;       Peephole 244.a  moving first to a instead of r%1
+	mov	a,dpl
+	mov	r%1,a
+}
+
+// applies to f.e. _itoa.c (saving 1 cycle)
+replace {
+	mov	r%1,dph
+	mov	a,r%1
+} by {
+        ;       Peephole 244.b  moving first to a instead of r%1
+	mov	a,dph
+	mov	r%1,a
+}
+
+
+// applies to f.e. bug-460010.c (saving 1 cycle)
+replace {
+	mov	r%1,a
+	mov	dpl,r%1
+} by {
+        ;       Peephole 244.c  loading dpl from a instead of r%1
+	mov	r%1,a
+	mov	dpl,a
+}
+
+replace {
+	mov	r%1,a
+	mov	dph,r%1
+} by {
+        ;       Peephole 244.d  loading dph from a instead of r%1
+	mov	r%1,a
+	mov	dph,a
+}
+
+// this one is safe but disables 245.a 245.b
+// please remove 245 if 245.a 245.b are found to be safe
+// applies to f.e. scott-compare.c
+replace {
+	clr	a
+	rlc	a
+	mov	r%1,a
+	cjne	a,#0x01,%2
+%2:	
+	clr	a
+	rlc	a
+	mov	r%1,a
+} by {
+        ;       Peephole 245    optimized complement (r%1 and acc set needed?)
+	cpl	c
+	clr	a
+	rlc	a
+	mov	r%1,a	
+} if labelRefCount %2 1
+
+// this one will not be triggered if 245 is present
+// please remove 245 if 245.a 245.b are found to be safe
+// applies to f.e. vprintf.c
+replace {
+	clr	a
+	rlc	a
+	mov	r%1,a
+	cjne	a,#0x01,%2
+%2:	
+	clr	a
+	rlc	a
+	mov	r%1,a
+	jz	%3
+} by {
+        ;       Peephole 245.a   optimized conditional jump (r%1 and acc not set!)
+	jc	%3
+} if labelRefCount %2 1
+
+// this one will not be triggered if 245 is present
+// please remove 245 if 245.a 245.b are found to be safe
+// applies to f.e. scott-compare.c
+replace {
+	clr	a
+	rlc	a
+	mov	r%1,a
+	cjne	a,#0x01,%2
+%2:	
+	clr	a
+	rlc	a
+	mov	r%1,a
+	jnz	%3
+} by {
+        ;       Peephole 245.b   optimized conditional jump (r%1 and acc not set!)
+	jnc	%3
+} if labelRefCount %2 1
-- 
2.47.2