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[avr-gcc-list] Number of Clocks

From: User Tomdean
Subject: [avr-gcc-list] Number of Clocks
Date: Sun, 4 Sep 2005 10:49:55 -0700 (PDT)

I have a piece of code that shows the number of cycles per instruction
in the output of 'avr-objdump -d' for 16-bit instruction CPUs.  It
uses a modified version of binutils-2.16/include/opcode/avr.h.

It is interesting to minimize the time in, for example, an ISR.  I
often use it with sed and awk,

        avr-objdump -d xxx.elf | avr-cycles \
        | sed -e 's/\[/\[ /' -e 's/\]/ ]/' \
        | awk 'BEGIN {a=b=c=ta=tb=tc=0}; \
                /^\[/ {a+=$$2;b+=$$3;c+=$$4;print}; \
                /^0/ {print a, b, c; ta+=a; tb+=b; tc+=c; a=0; b=0; c=0}; \
                END {print a, b, c; \
                        ta+=a; tb+=b; tc+=c; \
                        print "\nTotals:"; \
                        print "Bytes", "Minumum", "Maximum"; \
                        printf "%5d %7d %7d\n", ta, tb, tc }'

If that is interesting, I will post it, some 500 lines of
clumped-together code and lots of comments.


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