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ruanhaishen
Tiny AES C
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cde9cf2e
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cde9cf2e
authored
Jun 02, 2014
by
kokke
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Update README.md
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@@ -17,12 +17,25 @@ GCC size output when compiled for ARM:
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@@ -17,12 +17,25 @@ GCC size output when compiled for ARM:
$ size aes.o
$ size aes.o
text data bss dec hex filename
text data bss dec hex filename
1079 0 204 1283 503 aes.o
1079 0 204 1283 503 aes.o
$ arm-none-eabi-gcc -O2 -c aes.c -o aes.o
$ arm-none-eabi-gcc -O2 -c aes.c -o aes.o
$ size aes.o
$ size aes.o
text data bss dec hex filename
text data bss dec hex filename
1024 0 204 1228 4cc aes.o
1024 0 204 1228 4cc aes.o
And if we're compiling for the Thumb ISA:
$ arm-none-eabi-gcc -O2 -c -mthumb aes.c -o aes.o
$ size aes.o
text data bss dec hex filename
856 0 204 1060 424 aes.o
$ arm-none-eabi-gcc -Os -c -mthumb aes.c -o aes.o
$ size aes.o
text data bss dec hex filename
867 0 204 1071 42f aes.o
Somehow, -O2 is a bit smaller than -Os with this compiler. I am using Mentor Graphics ARM toolchain:
Somehow, -O2 is a bit smaller than -Os with this compiler. I am using Mentor Graphics ARM toolchain:
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