foo.ll

; ModuleID = 'foo.c'
source_filename = "foo.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"

@.str = private unnamed_addr constant [13 x i8] c"hello, world\00", align 1

; Function Attrs: nounwind ssp uwtable
define i32 @main() #0 {
  %1 = alloca i32, align 4
  store i32 0, i32* %1, align 4
  %2 = call i32 (i8*, ...) bitcast (i32 (...)* @puts to i32 (i8*, ...)*)(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i32 0, i32 0))
  ret i32 0
}

declare i32 @puts(...) #1

attributes #0 = { nounwind ssp uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.module.flags = !{!0}
!llvm.ident = !{!1}

!0 = !{i32 1, !"PIC Level", i32 2}
!1 = !{!"Apple LLVM version 8.0.0 (clang-800.0.42.1)"}

foo.yaml

--- |
  ; ModuleID = 'foo.ll'
  source_filename = "foo.c"
  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-apple-macosx10.12.0"
  
  @.str = private unnamed_addr constant [13 x i8] c"hello, world\00", align 1
  
  ; Function Attrs: nounwind ssp uwtable
  define i32 @main() #0 {
    %1 = alloca i32, align 4
    store i32 0, i32* %1, align 4
    %2 = call i32 (i8*, ...) bitcast (i32 (...)* @puts to i32 (i8*, ...)*)(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i32 0, i32 0))
    ret i32 0
  }
  
  declare i32 @puts(...) #1
  
  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**) #2
  
  attributes #0 = { nounwind ssp uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3" "unsafe-fp-math"="false" "use-soft-float"="false" }
  attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3" "unsafe-fp-math"="false" "use-soft-float"="false" }
  attributes #2 = { nounwind }
  
  !llvm.module.flags = !{!0}
  !llvm.ident = !{!1}
  
  !0 = !{i32 1, !"PIC Level", i32 2}
  !1 = !{!"Apple LLVM version 8.0.0 (clang-800.0.42.1)"}

...
---
name:            main
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
calleeSavedRegisters: [ '%bh', '%bl', '%bp', '%bpl', '%bx', '%ebp', '%ebx', 
                        '%rbp', '%rbx', '%r12', '%r13', '%r14', '%r15', 
                        '%r12b', '%r13b', '%r14b', '%r15b', '%r12d', '%r13d', 
                        '%r14d', '%r15d', '%r12w', '%r13w', '%r14w', '%r15w' ]
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       24
  offsetAdjustment: -16
  maxAlignment:    4
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
fixedStack:      
  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16 }
stack:           
  - { id: 0, name: '<unnamed alloca>', offset: -20, size: 4, alignment: 4 }
body:             |
  bb.0 (%ir-block.0):
    liveins: %rbp
  
    frame-setup PUSH64r killed %rbp, implicit-def %rsp, implicit %rsp
    CFI_INSTRUCTION def_cfa_offset 16
    CFI_INSTRUCTION offset %rbp, -16
    %rbp = frame-setup MOV64rr %rsp
    CFI_INSTRUCTION def_cfa_register %rbp
    %rsp = frame-setup SUB64ri8 %rsp, 16, implicit-def dead %eflags
    MOV32mi %rbp, 1, _, -4, _, 0 :: (store 4 into %ir.1)
    %rdi = LEA64r %rip, 1, _, @.str, _
    dead %eax = MOV32r0 implicit-def dead %eflags, implicit-def %al
    CALL64pcrel32 @puts, csr_64, implicit %rsp, implicit %rdi, implicit killed %al, implicit-def %rsp, implicit-def dead %eax
    %eax = MOV32r0 implicit-def dead %eflags
    %rsp = ADD64ri8 %rsp, 16, implicit-def dead %eflags
    %rbp = POP64r implicit-def %rsp, implicit %rsp
    RET 0, killed %eax

...