The compiler is able to optimize both forms of get_cert_length to same code.
get_cert_length
Check this playground
playground::get_cert_length_mul: pushq %rax cmpq $13, %rsi jb .LBB8_4 je .LBB8_5 cmpq $15, %rsi jb .LBB8_6 movzbl 12(%rdi), %eax movzbl 13(%rdi), %esi movzbl 14(%rdi), %edx movl %eax, %edi popq %rax jmp playground::get2_cert_length_mul playground::get_cert_length_shift: pushq %rax cmpq $13, %rsi jb .LBB9_4 je .LBB9_5 cmpq $15, %rsi jb .LBB9_6 movzbl 12(%rdi), %eax movzbl 13(%rdi), %esi movzbl 14(%rdi), %edx movl %eax, %edi popq %rax jmp playground::get2_cert_length_mul playground::get2_cert_length_mul: shll $16, %edi shll $8, %esi leal (%rsi,%rdi), %eax addl %edx, %eax retq
Yip that makes sense. The shift vs multiply versions were more about which one looks less magical 😄
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The compiler is able to optimize both forms of
get_cert_lengthto same code.Check this playground
Yip that makes sense. The shift vs multiply versions were more about which one looks less magical 😄