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Title: Micro-optimize list index range checks by rhettinger · Pull Request #9784 · python/cpython · GitHub

Open Graph Title: Micro-optimize list index range checks by rhettinger · Pull Request #9784 · python/cpython

X Title: Micro-optimize list index range checks by rhettinger · Pull Request #9784 · python/cpython

Description: Old code _list_item: testq %rsi, %rsi js L282 cmpq %rsi, 16(%rdi) jg L283 ... L283: movq 24(%rdi), %rax movq (%rax,%rsi,8), %rax addq $1, (%rax) ret New code _list_item: cmpq 16(%rdi), %rsi jb L282 ... L282: movq 24(%rdi), %rax movq (%rax,%rsi,8), %rax addq $1, (%rax) ret

Open Graph Description: Old code _list_item: testq %rsi, %rsi js L282 cmpq %rsi, 16(%rdi) jg L283 ... L283: movq 24(%rdi), %rax movq (%rax,%rsi,8), %rax addq $1, (%rax) ...

X Description: Old code _list_item: testq %rsi, %rsi js L282 cmpq %rsi, 16(%rdi) jg L283 ... L283: movq 24(%rdi), %rax movq (%rax,%rsi,8), %rax addq $1, (%rax) ...

Opengraph URL: https://github.com/python/cpython/pull/9784

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d152678 Optimize list_item rhettinger Oct 10, 2018 https://github.com/python/cpython/pull/9784/commits/d1526787cce0434dc86f2be36dea9b295b85ba57
65b589b Convert the other range checks as well rhettinger Oct 10, 2018 https://github.com/python/cpython/pull/9784/commits/65b589b983e4aedb040656589bab6f9f82750755
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