; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Examples/ARM/arm_convolution_example (q15)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @arm_compare_fixed_q15(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %44, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp ult i32 %12, %13
  br i1 %14, label %15, label %47

15:                                               ; preds = %11
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = zext i32 %17 to i64
  %19 = getelementptr inbounds i16, ptr %16, i64 %18
  %20 = load i16, ptr %19, align 2, !tbaa !11
  %21 = sext i16 %20 to i32
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = zext i32 %23 to i64
  %25 = getelementptr inbounds i16, ptr %22, i64 %24
  %26 = load i16, ptr %25, align 2, !tbaa !11
  %27 = sext i16 %26 to i32
  %28 = sub nsw i32 %21, %27
  store i32 %28, ptr %8, align 4, !tbaa !9
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = icmp sgt i32 %29, 0
  br i1 %30, label %31, label %33

31:                                               ; preds = %15
  %32 = load i32, ptr %8, align 4, !tbaa !9
  br label %36

33:                                               ; preds = %15
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = sub nsw i32 0, %34
  br label %36

36:                                               ; preds = %33, %31
  %37 = phi i32 [ %32, %31 ], [ %35, %33 ]
  store i32 %37, ptr %9, align 4, !tbaa !9
  %38 = load i32, ptr %9, align 4, !tbaa !9
  %39 = load i32, ptr %10, align 4, !tbaa !9
  %40 = icmp ugt i32 %38, %39
  br i1 %40, label %41, label %43

41:                                               ; preds = %36
  %42 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %42, ptr %10, align 4, !tbaa !9
  br label %43

43:                                               ; preds = %41, %36
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %7, align 4, !tbaa !9
  %46 = add i32 %45, 1
  store i32 %46, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

47:                                               ; preds = %11
  %48 = load i32, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %48
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nounwind }

!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, !12, i64 0}
!12 = !{!"short", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; 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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local range(i32 -65535, 65536) i32 @arm_compare_fixed_q15(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %wide.trip.count = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 8
  br i1 %min.iters.check, label %.lr.ph.preheader22, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 4294967288
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %16, %vector.body ]
  %vec.phi18 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %17, %vector.body ]
  %4 = getelementptr inbounds i16, ptr %0, i64 %index
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  %wide.load = load <4 x i16>, ptr %4, align 2, !tbaa !5
  %wide.load19 = load <4 x i16>, ptr %5, align 2, !tbaa !5
  %6 = sext <4 x i16> %wide.load to <4 x i32>
  %7 = sext <4 x i16> %wide.load19 to <4 x i32>
  %8 = getelementptr inbounds i16, ptr %1, i64 %index
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  %wide.load20 = load <4 x i16>, ptr %8, align 2, !tbaa !5
  %wide.load21 = load <4 x i16>, ptr %9, align 2, !tbaa !5
  %10 = sext <4 x i16> %wide.load20 to <4 x i32>
  %11 = sext <4 x i16> %wide.load21 to <4 x i32>
  %12 = sub nsw <4 x i32> %6, %10
  %13 = sub nsw <4 x i32> %7, %11
  %14 = tail call <4 x i32> @llvm.abs.v4i32(<4 x i32> %12, i1 true)
  %15 = tail call <4 x i32> @llvm.abs.v4i32(<4 x i32> %13, i1 true)
  %16 = tail call <4 x i32> @llvm.umax.v4i32(<4 x i32> %14, <4 x i32> %vec.phi)
  %17 = tail call <4 x i32> @llvm.umax.v4i32(<4 x i32> %15, <4 x i32> %vec.phi18)
  %index.next = add nuw i64 %index, 8
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %rdx.minmax = tail call <4 x i32> @llvm.umax.v4i32(<4 x i32> %16, <4 x i32> %17)
  %19 = tail call i32 @llvm.vector.reduce.umax.v4i32(<4 x i32> %rdx.minmax)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader22

.lr.ph.preheader22:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.016.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %19, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader22, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader22 ]
  %.016 = phi i32 [ %spec.select, %.lr.ph ], [ %.016.ph, %.lr.ph.preheader22 ]
  %20 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv
  %21 = load i16, ptr %20, align 2, !tbaa !5
  %22 = sext i16 %21 to i32
  %23 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv
  %24 = load i16, ptr %23, align 2, !tbaa !5
  %25 = sext i16 %24 to i32
  %26 = sub nsw i32 %22, %25
  %27 = tail call i32 @llvm.abs.i32(i32 %26, i1 true)
  %spec.select = tail call i32 @llvm.umax.i32(i32 %27, i32 %.016)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %3
  %.0.lcssa = phi i32 [ 0, %3 ], [ %19, %middle.block ], [ %spec.select, %.lr.ph ]
  ret i32 %.0.lcssa
}

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

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x i32> @llvm.abs.v4i32(<4 x i32>, i1 immarg) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x i32> @llvm.umax.v4i32(<4 x i32>, <4 x i32>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.umax.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass