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2022-10-21 08:06:07 +02:00
commit 71dac77d1b
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+; ------------------------------------------------------------------
+; --  _____       ______  _____                                    -
+; -- |_   _|     |  ____|/ ____|                                   -
+; --   | |  _ __ | |__  | (___    Institute of Embedded Systems    -
+; --   | | | '_ \|  __|  \___ \   Zurich University of             -
+; --  _| |_| | | | |____ ____) |  Applied Sciences                 -
+; -- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+; ------------------------------------------------------------------
+; --
+; -- arithm.s
+; --
+; -- CT1 P05 Summe und Differenz
+; --
+; -- $Id: arithm.s 549 2014-09-01 13:00:11Z muln $
+; ------------------------------------------------------------------
+;Directives
+        PRESERVE8
+        THUMB
+
+; ------------------------------------------------------------------
+; -- myCode
+; ------------------------------------------------------------------
+        AREA MyCode, CODE, READONLY
+
+main    PROC
+        EXPORT main
+
+user_prog
+        
+; ------------------------------------------------------------------
+; -- Increment/Decrement with ADDS and SUBS
+        MOVS    R1, #0
+        ADDS    R1, R1, #1
+        ADDS    R1, R1, #1
+        SUBS    R1, R1, #1
+        SUBS    R1, R1, #1
+        SUBS    R1, R1, #1
+        SUBS    R1, R1, #1
+        SUBS    R1, R1, #1
+        ADDS    R1, R1, #1
+        ADDS    R1, R1, #1
+        ADDS    R1, R1, #1
+        ADDS    R1, R1, #1
+        ADDS    R1, R1, #1
+        
+        
+; ------------------------------------------------------------------
+; -- ADDS and SUBS (negative, positive, overflow)
+        LDR     R0, =0x6a000000
+        LDR     R1, =0x2efffffe
+        ADDS    R1, R1, R1
+        ADDS    R0, R0, R1
+        ADDS    R0, R0, R1
+        
+        LDR     R0, =0xa1000000
+        LDR     R1, =0x5efffffe
+        SUBS    R0, R0, R1
+        SUBS    R0, R0, R1
+
+; ------------------------------------------------------------------
+; -- ADDS and RSBS vs. SUBS (compare R0 and R2)
+        LDR     R0, =0x4a000000
+        LDR     R1, =0x2efffffe
+        MOV     R2, R0
+
+        SUBS    R0, R0, R1
+        RSBS    R1, R1, #0
+        ADDS    R2, R2, R1
+
+; ------------------------------------------------------------------
+; -- MUL flags and cut-off if result needs more than 32 bits
+        LDR     R0, =0x0000e200
+        LDR     R1, =0x00002201
+        
+        MULS    R0, R1, R0
+        LDR     R1, =0x00000f20
+        MULS    R0, R1, R0
+        MULS    R0, R1, R0
+
+        B       user_prog
+        ALIGN
+; ------------------------------------------------------------------
+; End of code
+; ------------------------------------------------------------------
+        ENDP
+        END