take_magic_damage

answer.c

int take_magic_damage(int health, int resist, int amp, int spell_power) {
        int full_damage = spell_power * amp;
        int damage_taken = full_damage - resist;
        return health - damage_taken;
}

answer.s

        .text
        .intel_syntax noprefix
        .file   "answer.c"
        .globl  take_magic_damage               # -- Begin function take_magic_damage
        .p2align        4, 0x90
        .type   take_magic_damage,@function
take_magic_damage:                      # @take_magic_damage
        .cfi_startproc
# %bb.0:
        push    rbp
        .cfi_def_cfa_offset 16
        .cfi_offset rbp, -16
        mov     rbp, rsp
        .cfi_def_cfa_register rbp
                                        # kill: def $esi killed $esi def $rsi
                                        # kill: def $edi killed $edi def $rdi
        imul    edx, ecx
        lea     eax, [rdi + rsi]
        sub     eax, edx
        pop     rbp
        .cfi_def_cfa rsp, 8
        ret
.Lfunc_end0:
        .size   take_magic_damage, .Lfunc_end0-take_magic_damage
        .cfi_endproc
                                        # -- End function
        .ident  "FreeBSD clang version 18.1.6 (https://github.com/llvm/llvm-project.git llvmorg-18.1.6-0-g1118c2e05e67)"
        .section        ".note.GNU-stack","",@progbits
        .addrsig

compile.sh

#!/bin/ksh
clang -O3 -S -masm=intel answer.c
clang -O3 -S -masm=intel dillon.c
clang -O3 -S -masm=intel ross.c

dillon.c

int take_magic_damage(int health, int resist, int amp, int spell_power) {
        int new_health = health - (spell_power * amp - resist);
        return new_health;
}

dillon.s

        .text
        .intel_syntax noprefix
        .file   "dillon.c"
        .globl  take_magic_damage               # -- Begin function take_magic_damage
        .p2align        4, 0x90
        .type   take_magic_damage,@function
take_magic_damage:                      # @take_magic_damage
        .cfi_startproc
# %bb.0:
        push    rbp
        .cfi_def_cfa_offset 16
        .cfi_offset rbp, -16
        mov     rbp, rsp
        .cfi_def_cfa_register rbp
                                        # kill: def $esi killed $esi def $rsi
                                        # kill: def $edi killed $edi def $rdi
        imul    edx, ecx
        lea     eax, [rdi + rsi]
        sub     eax, edx
        pop     rbp
        .cfi_def_cfa rsp, 8
        ret
.Lfunc_end0:
        .size   take_magic_damage, .Lfunc_end0-take_magic_damage
        .cfi_endproc
                                        # -- End function
        .ident  "FreeBSD clang version 18.1.6 (https://github.com/llvm/llvm-project.git llvmorg-18.1.6-0-g1118c2e05e67)"
        .section        ".note.GNU-stack","",@progbits
        .addrsig

ross.c

int take_magic_damage(int health, int resist, int amp, int spell_power) {
        return health - (spell_power * amp - resist);
}

ross.s

        .text
        .intel_syntax noprefix
        .file   "ross.c"
        .globl  take_magic_damage               # -- Begin function take_magic_damage
        .p2align        4, 0x90
        .type   take_magic_damage,@function
take_magic_damage:                      # @take_magic_damage
        .cfi_startproc
# %bb.0:
        push    rbp
        .cfi_def_cfa_offset 16
        .cfi_offset rbp, -16
        mov     rbp, rsp
        .cfi_def_cfa_register rbp
                                        # kill: def $esi killed $esi def $rsi
                                        # kill: def $edi killed $edi def $rdi
        imul    edx, ecx
        lea     eax, [rdi + rsi]
        sub     eax, edx
        pop     rbp
        .cfi_def_cfa rsp, 8
        ret
.Lfunc_end0:
        .size   take_magic_damage, .Lfunc_end0-take_magic_damage
        .cfi_endproc
                                        # -- End function
        .ident  "FreeBSD clang version 18.1.6 (https://github.com/llvm/llvm-project.git llvmorg-18.1.6-0-g1118c2e05e67)"
        .section        ".note.GNU-stack","",@progbits
        .addrsig

run.txt

rnelson@reject:/home/rnelson/tmp/take_magic_damage $ ./compile.sh 
rnelson@reject:/home/rnelson/tmp/take_magic_damage $ ls
answer.c    answer.s    compile.sh* dillon.c    dillon.s    ross.c      ross.s
rnelson@reject:/home/rnelson/tmp/take_magic_damage $ diff answer.s ross.s                                                                                             
3c3
<       .file   "answer.c"
---
>       .file   "ross.c"
rnelson@reject:/home/rnelson/tmp/take_magic_damage $ diff answer.s dillon.s                                                                                           
3c3
<       .file   "answer.c"
---
>       .file   "dillon.c"
rnelson@reject:/home/rnelson/tmp/take_magic_damage $