There are over 10 patches and I plan to split them up and do a PR.
Link to patch collection: master...dearblue:mruby:mruby-vm
When all patches are applied, I show how the object code size and stack size used by mrb_vm_exec() changes on several CPU architectures.
The comparison is the result of simply running the compiler from the command line and compiling src/vm.c.
The commit hashes to be compared are ac8846d and 873b8bb .
The filename of the object code is represented by #{revision}-#{gcc-name}-vm.o.
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script
for rev in ac8846d 873b8bb do git checkout $rev for gcc in /usr/local/bin/*-gcc-*.0 do $gcc -Iinclude -Ibuild/host/include -fstack-usage -Os -c -o $rev-$(basename $gcc)-vm.o src/vm.c done done size ac8846d*.o 873b8bb*.o | sort -st- -k2 grep -w mrb_vm_exec ac8846d-*.su 873b8bb-*.su | sort -st- -k2 | awk '{ printf "%3d %-15s %s\n", $2, $3, $1 }'
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list of compilers on my FreeBSD 14.1/amd64
/usr/local/bin/aarch64-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/arm-none-eabi-gcc-11.3.0 /usr/local/bin/armv6-gnueabi-freebsd14.0-gcc-12.3.0 /usr/local/bin/armv7-gnueabi-freebsd14.0-gcc-12.3.0 /usr/local/bin/avr-gcc-14.1.0 /usr/local/bin/i386-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/mips-unknown-freebsd14.0-gcc-9.5.0 /usr/local/bin/mips64-unknown-freebsd14.0-gcc-9.5.0 /usr/local/bin/powerpc-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/powerpc64-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/riscv32-unknown-elf-gcc-11.3.0 /usr/local/bin/riscv64-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/sparc64-unknown-freebsd14.0-gcc-9.5.0 /usr/local/bin/x86_64-unknown-freebsd14.0-gcc-12.3.0 /usr/local/bin/xtensa-esp32-elf-gcc-5.2.0
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result of
size ac8846d*.o 873b8bb*.o | sort -st- -k2text data bss dec hex filename 36243 0 0 36243 0x8d93 ac8846d-aarch64-unknown-freebsd14.0-gcc-12.3.0-vm.o 36554 0 0 36554 0x8eca 873b8bb-aarch64-unknown-freebsd14.0-gcc-12.3.0-vm.o 36503 0 0 36503 0x8e97 ac8846d-arm-none-eabi-gcc-11.3.0-vm.o 35978 0 0 35978 0x8c8a 873b8bb-arm-none-eabi-gcc-11.3.0-vm.o 33879 0 0 33879 0x8457 ac8846d-armv6-gnueabi-freebsd14.0-gcc-12.3.0-vm.o 32546 0 0 32546 0x7f22 873b8bb-armv6-gnueabi-freebsd14.0-gcc-12.3.0-vm.o 33695 0 0 33695 0x839f ac8846d-armv7-gnueabi-freebsd14.0-gcc-12.3.0-vm.o 32362 0 0 32362 0x7e6a 873b8bb-armv7-gnueabi-freebsd14.0-gcc-12.3.0-vm.o 51606 0 0 51606 0xc996 ac8846d-avr-gcc-14.1.0-vm.o 51474 0 0 51474 0xc912 873b8bb-avr-gcc-14.1.0-vm.o 31754 0 0 31754 0x7c0a ac8846d-i386-unknown-freebsd14.0-gcc-12.3.0-vm.o 28735 0 0 28735 0x703f 873b8bb-i386-unknown-freebsd14.0-gcc-12.3.0-vm.o 45592 424 0 46016 0xb3c0 ac8846d-mips-unknown-freebsd14.0-gcc-9.5.0-vm.o 45920 424 0 46344 0xb508 873b8bb-mips-unknown-freebsd14.0-gcc-9.5.0-vm.o 45392 848 0 46240 0xb4a0 ac8846d-mips64-unknown-freebsd14.0-gcc-9.5.0-vm.o 45920 848 0 46768 0xb6b0 873b8bb-mips64-unknown-freebsd14.0-gcc-9.5.0-vm.o 33947 0 0 33947 0x849b ac8846d-powerpc-unknown-freebsd14.0-gcc-12.3.0-vm.o 35006 0 0 35006 0x88be 873b8bb-powerpc-unknown-freebsd14.0-gcc-12.3.0-vm.o 35639 40 0 35679 0x8b5f ac8846d-powerpc64-unknown-freebsd14.0-gcc-12.3.0-vm.o 36594 40 0 36634 0x8f1a 873b8bb-powerpc64-unknown-freebsd14.0-gcc-12.3.0-vm.o 29306 0 0 29306 0x727a ac8846d-riscv32-unknown-elf-gcc-11.3.0-vm.o 30382 0 0 30382 0x76ae 873b8bb-riscv32-unknown-elf-gcc-11.3.0-vm.o 31492 0 0 31492 0x7b04 ac8846d-riscv64-unknown-freebsd14.0-gcc-12.3.0-vm.o 32640 0 0 32640 0x7f80 873b8bb-riscv64-unknown-freebsd14.0-gcc-12.3.0-vm.o 40306 0 0 40306 0x9d72 ac8846d-sparc64-unknown-freebsd14.0-gcc-9.5.0-vm.o 40226 0 0 40226 0x9d22 873b8bb-sparc64-unknown-freebsd14.0-gcc-9.5.0-vm.o 43734 0 0 43734 0xaad6 ac8846d-x86_64-unknown-freebsd14.0-gcc-12.3.0-vm.o 38968 0 0 38968 0x9838 873b8bb-x86_64-unknown-freebsd14.0-gcc-12.3.0-vm.o 26361 0 0 26361 0x66f9 ac8846d-xtensa-esp32-elf-gcc-5.2.0-vm.o 26216 0 0 26216 0x6668 873b8bb-xtensa-esp32-elf-gcc-5.2.0-vm.o -
result of
grep -w mrb_vm_exec ac8846d-*.su 873b8bb-*.su | sort -st- -k2 | awk '{ printf "%3d %-15s %s\n", $2, $3, $1 }'400 static ac8846d-aarch64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 384 static 873b8bb-aarch64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 248 static ac8846d-arm-none-eabi-gcc-11.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 216 static 873b8bb-arm-none-eabi-gcc-11.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 216 static ac8846d-armv6-gnueabi-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 200 static 873b8bb-armv6-gnueabi-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 216 static ac8846d-armv7-gnueabi-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 200 static 873b8bb-armv7-gnueabi-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 456 dynamic,bounded ac8846d-avr-gcc-14.1.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 474 dynamic,bounded 873b8bb-avr-gcc-14.1.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 576 dynamic,bounded ac8846d-i386-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 624 dynamic,bounded 873b8bb-i386-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 352 static ac8846d-mips-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1396:1:mrb_vm_exec 368 static 873b8bb-mips-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1405:1:mrb_vm_exec 576 static ac8846d-mips64-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1396:1:mrb_vm_exec 560 static 873b8bb-mips64-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1405:1:mrb_vm_exec 368 static ac8846d-powerpc-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 352 static 873b8bb-powerpc-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 656 static ac8846d-powerpc64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 592 static 873b8bb-powerpc64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 288 static ac8846d-riscv32-unknown-elf-gcc-11.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 272 static 873b8bb-riscv32-unknown-elf-gcc-11.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 528 static ac8846d-riscv64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 528 static 873b8bb-riscv64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 832 static ac8846d-sparc64-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1396:1:mrb_vm_exec 800 static 873b8bb-sparc64-unknown-freebsd14.0-gcc-9.5.0-vm.su:vm.c:1405:1:mrb_vm_exec 576 dynamic,bounded ac8846d-x86_64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1396:1:mrb_vm_exec 656 dynamic,bounded 873b8bb-x86_64-unknown-freebsd14.0-gcc-12.3.0-vm.su:src/vm.c:1405:1:mrb_vm_exec 240 static ac8846d-xtensa-esp32-elf-gcc-5.2.0-vm.su:vm.c:1396:1:mrb_vm_exec 240 static 873b8bb-xtensa-esp32-elf-gcc-5.2.0-vm.su:vm.c:1405:1:mrb_vm_exec