Added bug 469671

[fw/sdcc] / src / mcs51 / peeph.def

diff --git a/src/mcs51/peeph.def b/src/mcs51/peeph.def
index e6008fe9520fa31748f7bb4acc720fc31ff03e4d..e26372e8135f77f2f585f0af33c465453a4cbe4f 100644 (file)
--- a/src/mcs51/peeph.def
+++ b/src/mcs51/peeph.def
@@ -70,7 +70,6 @@ replace {
         mov  dptr,#%2
         movx @dptr,a
 }
-
 replace {
        mov  a,acc
 } by {
@@ -990,13 +989,14 @@ replace {
         mov  %1,@r%2
 }
 
-replace {
-        mov  %1,%2
-        mov  %2,%1
-} by {
-        ; Peephole 177   removed redundant mov
-        mov  %1,%2
-}
+// this one will screw assignes to volatile/sfr's
+//replace {
+//        mov  %1,%2
+//        mov  %2,%1
+//} by {
+//        ; Peephole 177   removed redundant mov
+//        mov  %1,%2
+//}
 
 replace {
         mov  a,%1
@@ -1036,6 +1036,16 @@ replace {
         mov  dptr,#0x0000
 }
 
+// saving 3 bytes, 2 cycles
+// provided by Bernhard Held <bernhard.held@de.westinghouse.com>
+replace {
+       mov dpl,#%1
+       mov dph,#(%1 >> 8)
+} by {
+       ; Peephole 182a use 16 bit load of DPTR
+       mov dptr,#%1
+}
+
 // saving 3 byte, 2 cycles, return(float_constant) profits here
 replace {
         mov  dpl,#%1
@@ -1764,11 +1774,158 @@ replace {
 }
 
 replace {
-       mov     dps, #0x00
-       mov     dp%1,a
-       mov     dps, #0x01
+        mov     %1,dpl
+        mov     %2,dph
+        mov     dpl,%1
+        mov     dph,%2
 } by {
-       ; Peephole 222 removed DPS abuse.
-       mov     dp%1,a
-        mov     dps, #0x01
+        ; Peephole 223   removed redundant dph/dpl moves
+        mov     %1,dpl
+        mov     %2,dph
+}
+
+replace {
+        mov     %1,dpl
+        mov     (%1 + 1),dph
+        mov     dpl,%1
+        mov     dph,(%1 + 1)
+} by {
+        ; Peephole 224   removed redundant dph/dpl moves
+        mov     %1,dpl
+        mov     (%1 + 1),dph
 }
+
+replace {
+        mov     a,%1
+        movx    @dptr,a
+        mov     dpl,%2
+        mov     dph,%3
+        mov     b,%4
+        mov     a,%1
+} by {
+        ; Peephole 225   removed redundant move to acc
+        mov     a,%1
+        movx    @dptr,a
+        mov     dpl,%2
+        mov     dph,%3
+        mov     b,%4
+}
+
+replace {
+        clr  a
+        movx @dptr,a
+        inc  dptr
+        movx @dptr,a
+        inc     dptr
+        clr  a
+} by {
+        ; Peephole 226   removed unnecessary clr
+        clr     a
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        inc     dptr
+}
+
+replace {
+        mov     dptr,#%1
+        clr     a
+        inc     dptr
+        inc     dptr
+        inc     dptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+} by {
+        ; Peephole 227   replaced inefficient 32 bit clear
+        mov     dptr,#%1
+        clr     a
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        mov     dptr,#%1
+}
+
+replace {
+        mov     dptr,#%1
+        clr     a
+        inc     dptr
+        inc     dptr
+        inc     dptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+        lcall   __decdptr
+        mov     a,#%2
+        movx    @dptr,a
+} by {
+        ; Peephole 228   replaced inefficient 32 constant
+        mov     dptr,#%1
+        mov     a, #%2
+        movx    @dptr,a
+        inc     dptr
+        clr     a
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        mov     dptr,#%1
+}
+
+replace {
+        mov     dptr,#%1
+        clr     a
+        inc     dptr
+        movx    @dptr,a
+        lcall   __decdptr
+        movx    @dptr,a
+} by {
+        ; Peephole 229   replaced inefficient 16 bit clear
+        mov     dptr,#%1
+        clr     a
+        movx    @dptr,a
+        inc     dptr
+        movx    @dptr,a
+        mov     dptr,#%1
+}
+
+replace {
+        mov     dptr,#%1
+        clr     a
+        inc     dptr
+        movx    @dptr,a
+        lcall   __decdptr
+        mov     a,#%2
+        movx    @dptr,a
+} by {
+        ; Peephole 230   replaced inefficient 16 constant
+        mov     dptr,#%1
+        mov     a,#%2
+        movx    @dptr,a
+        inc     dptr
+        clr     a
+        movx    @dptr,a
+        mov     dptr,#%1
+}
+
+// this last peephole often removes the last mov from 227-230
+replace {
+        mov     dptr,#%1
+        mov     dptr,#%2
+} by {
+        ; Peephole 231   removed redundant mov to dptr
+        mov     dptr,#%2
+}
+
+