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kokke
2014-06-02 22:35:03 +02:00
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commit cde9cf2e65
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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: