; LLVM IR from niuyishuai/PDCABB :: LAPACK_BLAS/LIBF2C/libf2c (i_len_trim)

; 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 i64 @i_len_trim(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %8 = load i64, ptr %5, align 8, !tbaa !9
  %9 = sub nsw i64 %8, 1
  %10 = trunc i64 %9 to i32
  store i32 %10, ptr %6, align 4, !tbaa !11
  br label %11

11:                                               ; preds = %27, %2
  %12 = load i32, ptr %6, align 4, !tbaa !11
  %13 = icmp sge i32 %12, 0
  br i1 %13, label %14, label %30

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = load i32, ptr %6, align 4, !tbaa !11
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i8, ptr %15, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !13
  %20 = sext i8 %19 to i32
  %21 = icmp ne i32 %20, 32
  br i1 %21, label %22, label %26

22:                                               ; preds = %14
  %23 = load i32, ptr %6, align 4, !tbaa !11
  %24 = add nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  store i64 %25, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %31

26:                                               ; preds = %14
  br label %27

27:                                               ; preds = %26
  %28 = load i32, ptr %6, align 4, !tbaa !11
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr %6, align 4, !tbaa !11
  br label %11, !llvm.loop !14

30:                                               ; preds = %11
  store i64 0, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %31

31:                                               ; preds = %30, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %32 = load i64, ptr %3, align 8
  ret i64 %32
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 willreturn memory(argmem: readwrite) }
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 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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(i64 0, 2147483648) i64 @i_len_trim(ptr nocapture noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = and i64 %1, 4294967295
  br label %4

4:                                                ; preds = %7, %2
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ %3, %2 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %5 = and i64 %indvars.iv.next, 2147483648
  %6 = icmp eq i64 %5, 0
  br i1 %6, label %7, label %.loopexit

7:                                                ; preds = %4
  %8 = and i64 %indvars.iv.next, 2147483647
  %9 = getelementptr inbounds i8, ptr %0, i64 %8
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %.not = icmp eq i8 %10, 32
  br i1 %.not, label %4, label %11, !llvm.loop !8

11:                                               ; preds = %7
  %12 = and i64 %indvars.iv, 4294967295
  br label %.loopexit

.loopexit:                                        ; preds = %4, %11
  %.06 = phi i64 [ %12, %11 ], [ 0, %4 ]
  ret i64 %.06
}

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" }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass