; LLVM IR from 0intro/wmii :: lib/libstuff/fmt (fmtbuf)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.Fmt = type { i8, ptr, ptr, ptr, ptr, ptr, i32, [1 x %struct.__va_list_tag], i32, i32, i32, i64, ptr, ptr, ptr }
%struct.__va_list_tag = type { i32, i32, ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local void @fmtbuf(ptr dead_on_unwind noalias writable sret(%struct.Fmt) align 8 %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %1, ptr %4, align 8, !tbaa !5
  store i32 %2, ptr %5, align 4, !tbaa !9
  %6 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 0
  store i8 0, ptr %6, align 8, !tbaa !11
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 1
  store ptr %7, ptr %8, align 8, !tbaa !14
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 2
  store ptr %9, ptr %10, align 8, !tbaa !15
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds i8, ptr %11, i64 %13
  %15 = getelementptr inbounds i8, ptr %14, i64 -1
  %16 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 3
  store ptr %15, ptr %16, align 8, !tbaa !16
  %17 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 4
  store ptr null, ptr %17, align 8, !tbaa !17
  %18 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 5
  store ptr null, ptr %18, align 8, !tbaa !18
  %19 = getelementptr inbounds %struct.Fmt, ptr %0, i32 0, i32 6
  store i32 0, ptr %19, align 8, !tbaa !19
  ret void
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !7, i64 0}
!12 = !{!"Fmt", !7, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40, !10, i64 48, !7, i64 56, !10, i64 80, !10, i64 84, !10, i64 88, !13, i64 96, !6, i64 104, !6, i64 112, !6, i64 120}
!13 = !{!"long", !7, i64 0}
!14 = !{!12, !6, i64 8}
!15 = !{!12, !6, i64 16}
!16 = !{!12, !6, i64 24}
!17 = !{!12, !6, i64 32}
!18 = !{!12, !6, i64 40}
!19 = !{!12, !10, i64 48}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.Fmt = type { i8, ptr, ptr, ptr, ptr, ptr, i32, [1 x %struct.__va_list_tag], i32, i32, i32, i64, ptr, ptr, ptr }
%struct.__va_list_tag = type { i32, i32, ptr, ptr }

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @fmtbuf(ptr dead_on_unwind noalias nocapture writable writeonly sret(%struct.Fmt) align 8 %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  store i8 0, ptr %0, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  store ptr %1, ptr %4, align 8, !tbaa !12
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  store ptr %1, ptr %5, align 8, !tbaa !13
  %6 = sext i32 %2 to i64
  %7 = getelementptr inbounds i8, ptr %1, i64 %6
  %8 = getelementptr inbounds i8, ptr %7, i64 -1
  %9 = getelementptr inbounds i8, ptr %0, i64 24
  store ptr %8, ptr %9, align 8, !tbaa !14
  %10 = getelementptr inbounds i8, ptr %0, i64 32
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(20) %10, i8 0, i64 20, i1 false)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !7, i64 0}
!6 = !{!"Fmt", !7, i64 0, !9, i64 8, !9, i64 16, !9, i64 24, !9, i64 32, !9, i64 40, !10, i64 48, !7, i64 56, !10, i64 80, !10, i64 84, !10, i64 88, !11, i64 96, !9, i64 104, !9, i64 112, !9, i64 120}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"any pointer", !7, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!"long", !7, i64 0}
!12 = !{!6, !9, i64 8}
!13 = !{!6, !9, i64 16}
!14 = !{!6, !9, i64 24}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass