; LLVM IR from BrunoLevy/learn-fpga :: LiteX/software/Doom/mc1-doom/src (m_fixed)

; 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"

; Function Attrs: nounwind uwtable
define dso_local i32 @FixedDiv(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = call i32 @llvm.abs.i32(i32 %6, i1 true)
  %8 = ashr i32 %7, 14
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = call i32 @llvm.abs.i32(i32 %9, i1 true)
  %11 = icmp sge i32 %8, %10
  br i1 %11, label %12, label %19

12:                                               ; preds = %2
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = xor i32 %13, %14
  %16 = icmp slt i32 %15, 0
  %17 = zext i1 %16 to i64
  %18 = select i1 %16, i32 -2147483648, i32 2147483647
  store i32 %18, ptr %3, align 4
  br label %27

19:                                               ; preds = %2
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = shl i64 %21, 16
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = sdiv i64 %22, %24
  %26 = trunc i64 %25 to i32
  store i32 %26, ptr %3, align 4
  br label %27

27:                                               ; preds = %19, %12
  %28 = load i32, ptr %3, align 4
  ret i32 %28
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local i32 @FixedDiv(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call i32 @llvm.abs.i32(i32 %0, i1 true)
  %4 = lshr i32 %3, 14
  %5 = tail call i32 @llvm.abs.i32(i32 %1, i1 true)
  %.not = icmp ult i32 %4, %5
  br i1 %.not, label %10, label %6

6:                                                ; preds = %2
  %7 = xor i32 %1, %0
  %8 = icmp slt i32 %7, 0
  %9 = select i1 %8, i32 -2147483648, i32 2147483647
  br label %16

10:                                               ; preds = %2
  %11 = sext i32 %0 to i64
  %12 = shl nsw i64 %11, 16
  %13 = sext i32 %1 to i64
  %14 = sdiv i64 %12, %13
  %15 = trunc i64 %14 to i32
  br label %16

16:                                               ; preds = %10, %6
  %.0 = phi i32 [ %9, %6 ], [ %15, %10 ]
  ret i32 %.0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,TailCallElimPass