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https://github.com/janishutz/eth-summaries.git
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[SPCA] Format
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@@ -1,13 +1,13 @@
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sum: // Label
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endbr64 // Indirect Branch target (No effect on code's logic)
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pushq %rbp // Preserve caller stack frame
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movq %rsp, %rbp // Set up new stack frame
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movl %edi, -20(%rbp) // Arg1 register -> stack
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movl %esi, -24(%rbp) // Arg2 register -> stack
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movl -20(%rbp), %edx // stack[Arg1] -> gp register
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movl -24(%rbp), %eax // stack[Arg2] -> gp register
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addl %edx, %eax // Add Arg1 + Arg2 -> gp register
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movl %eax, -4(%rbp) // result -> stack
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movl -4(%rbp), %eax // stack[result] -> return register
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popq %rbp // Restore caller stack frame
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ret // jump back to caller
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sum: # Label
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endbr64 # Indirect Branch target (No effect on code's logic)
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pushq %rbp # Preserve caller stack frame
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movq %rsp, %rbp # Set up new stack frame
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movl %edi, -20(%rbp) # Arg1 register -> stack
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movl %esi, -24(%rbp) # Arg2 register -> stack
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movl -20(%rbp), %edx # stack[Arg1] -> gp register
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movl -24(%rbp), %eax # stack[Arg2] -> gp register
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addl %edx, %eax # Add Arg1 + Arg2 -> gp register
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movl %eax, -4(%rbp) # result -> stack
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movl -4(%rbp), %eax # stack[result] -> return register
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popq %rbp # Restore caller stack frame
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ret # jump back to caller
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@@ -1,9 +1,9 @@
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max:
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cmpl %esi, %edi // Set condition flags
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jle .IF // Conditional jump if %edi <= %esi
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movl %edi, %edx // %edi -> return register
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cmpl %esi, %edi # Set condition flags
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jle .IF # Conditional jump if %edi <= %esi
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movl %edi, %edx # %edi -> return register
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jmp .ELSE
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.IF:
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movl %esi, %edx // &esi -> return register
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movl %esi, %edx # &esi -> return register
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.ELSE:
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ret
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ret
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@@ -1,8 +1,8 @@
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absdiff:
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movl %edi, %eax
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subl %esi, %eax // arg2 - arg1 -> eax
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subl %esi, %eax # arg2 - arg1 -> eax
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movl %esi, %edx
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subl %edi, %edx // arg1 - arg2 -> edx
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cmpl %esi, %edi // Set condition flags
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cmovle %edx, %eax // edx -> eax, only if eax <= edx
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ret
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subl %edi, %edx # arg1 - arg2 -> edx
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cmpl %esi, %edi # Set condition flags
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cmovle %edx, %eax # edx -> eax, only if eax <= edx
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ret
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@@ -12,4 +12,4 @@ A function using an \verb|if/else| construct to choose the maximum of $2$ number
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A function computing the absolute difference $|x-y|$ using an \verb|if/else| construct, might use a conditional \verb|move| instead:
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\inputcodewithfilename{gas}{code-examples/01_asm/}{03_absdiff.s}
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\inputcodewithfilename{gas}{code-examples/01_asm/}{03_absdiff.s}
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