; LLVM IR from beagleboard/librobotcontrol :: library/src/io (i2c)

; 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.rc_i2c_state_t = type { i8, i32, i32, i32 }

@i2c = external hidden global [6 x %struct.rc_i2c_state_t], align 16

; Function Attrs: nounwind uwtable
declare hidden i32 @__check_bus_range(i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none)
declare i64 @llvm.expect.i64(i64, i64) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @rc_i2c_get_lock(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = call i32 @__check_bus_range(i32 noundef %4)
  %6 = icmp ne i32 %5, 0
  %7 = xor i1 %6, true
  %8 = xor i1 %7, true
  %9 = zext i1 %8 to i32
  %10 = sext i32 %9 to i64
  %11 = call i64 @llvm.expect.i64(i64 %10, i64 0)
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %1
  store i32 -1, ptr %2, align 4
  br label %20

14:                                               ; preds = %1
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [6 x %struct.rc_i2c_state_t], ptr @i2c, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.rc_i2c_state_t, ptr %17, i32 0, i32 3
  %19 = load i32, ptr %18, align 4, !tbaa !9
  store i32 %19, ptr %2, align 4
  br label %20

20:                                               ; preds = %14, %13
  %21 = load i32, ptr %2, align 4
  ret i32 %21
}

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(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"}
!9 = !{!10, !6, i64 12}
!10 = !{!"rc_i2c_state_t", !7, i64 0, !6, i64 4, !6, i64 8, !6, i64 12}


; 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.rc_i2c_state_t = type { i8, i32, i32, i32 }

@i2c = external hidden local_unnamed_addr global [6 x %struct.rc_i2c_state_t], align 16

; Function Attrs: nounwind uwtable
declare hidden i32 @__check_bus_range(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @rc_i2c_get_lock(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call i32 @__check_bus_range(i32 noundef %0)
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %3, label %7, !prof !5

3:                                                ; preds = %1
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds [6 x %struct.rc_i2c_state_t], ptr @i2c, i64 0, i64 %4, i32 3
  %6 = load i32, ptr %5, align 4, !tbaa !6
  br label %7

7:                                                ; preds = %1, %3
  %.0 = phi i32 [ %6, %3 ], [ -1, %1 ]
  ret i32 %.0
}

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 = !{!"branch_weights", !"expected", i32 2000, i32 1}
!6 = !{!7, !10, i64 12}
!7 = !{!"rc_i2c_state_t", !8, i64 0, !10, i64 4, !10, i64 8, !10, i64 12}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,LowerExpectIntrinsicPass,SROAPass,SimplifyCFGPass,TailCallElimPass