TODO - ranger - mirror of ranger - a simple, vim-like file manager

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a808a661 generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-12 10:01:01 +0000

;/span> 15 #? 68/push 0x20/imm32 16 #? $dump-stack9: 17 #? b8/copy-to-eax 1/imm32/exit 18 #? cd/syscall 0x80/imm8 19 20 # This is not a regular function, so it won't be idiomatic. 21 # Registers must be properly restored. 22 # Registers can be spilled, but that modifies the stack and needs to be 23 # cleaned up. 24 25 # Overhead: 26 # 62 + n*6 instructions to push n bytes. 27 # If we just emitted code to push n zeroes, it would be: 28 # 5 bytes for 4 zero bytes, so 1.25 bytes per zero. And that's not even 29 # instructions. 30 # But on the other hand it would destroy the instruction cache, where this 31 # approach requires 15 instructions, fixed. 32 33 # n must be positive 34 push-n-zero-bytes: # n: int 35 $push-n-zero-bytes:prologue: 36 89/<- *<a href='302stack_allocate.subx.html#L56'>Push-n-zero-bytes-ebp</a> 5/r32/ebp # spill ebp without affecting stack 37 89/<- %ebp 4/r32/esp 38 $push-n-zero-bytes:copy-ra: 39 # -- esp = ebp 40 89/<- *<a href='302stack_allocate.subx.html#L60'>Push-n-zero-bytes-eax</a> 0/r32/eax 41 8b/-> *esp 0/r32/eax 42 2b/subtract *(ebp+4) 4/r32/esp 43 # -- esp+n = ebp 44 89/<- *esp 0/r32/eax 45 8b/-> *<a href='302stack_allocate.subx.html#L60'>Push-n-zero-bytes-eax</a> 0/r32/eax 46 $push-n-zero-bytes:bulk-cleaning: 47 89/<- *<a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a> 4/r32/esp 48 81 0/subop/add *<a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a> 4/imm32 49 81 0/subop/add *(ebp+4) 4/imm32 50 (<a href='120allocate.subx.html#L857'>zero-out</a> *<a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a> *(ebp+4)) # n+4 51 $push-n-zero-bytes:epilogue: 52 8b/-> *<a href='302stack_allocate.subx.html#L56'>Push-n-zero-bytes-ebp</a> 5/r32/ebp # restore spill 53 c3/return 54 55 == data 56 Push-n-zero-bytes-ebp: # (addr int) 57 0/imm32 58 Push-n-zero-bytes-esp: # (addr int) 59 0/imm32 60 Push-n-zero-bytes-eax: 61 0/imm32 </pre> </body> </html>