llvm/test/Transforms/Attributor/dereferenceable-2.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
; RUN: opt -attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
; RUN: opt -attributor-cgscc -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM

; Determine dereference-ability before unused loads get deleted:
; https://bugs.llvm.org/show_bug.cgi?id=21780

define <4 x double> @PR21780(double* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@PR21780
; CHECK-SAME: (double* nocapture nofree nonnull readonly align 8 dereferenceable(32) [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds double, double* [[PTR]], i64 1
; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds double, double* [[PTR]], i64 2
; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds double, double* [[PTR]], i64 3
; CHECK-NEXT:    [[T0:%.*]] = load double, double* [[PTR]], align 8
; CHECK-NEXT:    [[T1:%.*]] = load double, double* [[ARRAYIDX1]], align 8
; CHECK-NEXT:    [[T2:%.*]] = load double, double* [[ARRAYIDX2]], align 8
; CHECK-NEXT:    [[T3:%.*]] = load double, double* [[ARRAYIDX3]], align 8
; CHECK-NEXT:    [[VECINIT0:%.*]] = insertelement <4 x double> undef, double [[T0]], i32 0
; CHECK-NEXT:    [[VECINIT1:%.*]] = insertelement <4 x double> [[VECINIT0]], double [[T1]], i32 1
; CHECK-NEXT:    [[VECINIT2:%.*]] = insertelement <4 x double> [[VECINIT1]], double [[T2]], i32 2
; CHECK-NEXT:    [[VECINIT3:%.*]] = insertelement <4 x double> [[VECINIT2]], double [[T3]], i32 3
; CHECK-NEXT:    [[SHUFFLE:%.*]] = shufflevector <4 x double> [[VECINIT3]], <4 x double> [[VECINIT3]], <4 x i32> <i32 0, i32 0, i32 2, i32 2>
; CHECK-NEXT:    ret <4 x double> [[SHUFFLE]]
;

  ; GEP of index 0 is simplified away.
  %arrayidx1 = getelementptr inbounds double, double* %ptr, i64 1
  %arrayidx2 = getelementptr inbounds double, double* %ptr, i64 2
  %arrayidx3 = getelementptr inbounds double, double* %ptr, i64 3

  %t0 = load double, double* %ptr, align 8
  %t1 = load double, double* %arrayidx1, align 8
  %t2 = load double, double* %arrayidx2, align 8
  %t3 = load double, double* %arrayidx3, align 8

  %vecinit0 = insertelement <4 x double> undef, double %t0, i32 0
  %vecinit1 = insertelement <4 x double> %vecinit0, double %t1, i32 1
  %vecinit2 = insertelement <4 x double> %vecinit1, double %t2, i32 2
  %vecinit3 = insertelement <4 x double> %vecinit2, double %t3, i32 3
  %shuffle = shufflevector <4 x double> %vecinit3, <4 x double> %vecinit3, <4 x i32> <i32 0, i32 0, i32 2, i32 2>
  ret <4 x double> %shuffle
}


define double @PR21780_only_access3_with_inbounds(double* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@PR21780_only_access3_with_inbounds
; CHECK-SAME: (double* nocapture nofree nonnull readonly align 8 dereferenceable(32) [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds double, double* [[PTR]], i64 3
; CHECK-NEXT:    [[T3:%.*]] = load double, double* [[ARRAYIDX3]], align 8
; CHECK-NEXT:    ret double [[T3]]
;

  %arrayidx3 = getelementptr inbounds double, double* %ptr, i64 3
  %t3 = load double, double* %arrayidx3, align 8
  ret double %t3
}

define double @PR21780_only_access3_without_inbounds(double* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@PR21780_only_access3_without_inbounds
; CHECK-SAME: (double* nocapture nofree readonly align 8 [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr double, double* [[PTR]], i64 3
; CHECK-NEXT:    [[T3:%.*]] = load double, double* [[ARRAYIDX3]], align 8
; CHECK-NEXT:    ret double [[T3]]
;
  %arrayidx3 = getelementptr double, double* %ptr, i64 3
  %t3 = load double, double* %arrayidx3, align 8
  ret double %t3
}

define double @PR21780_without_inbounds(double* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@PR21780_without_inbounds
; CHECK-SAME: (double* nocapture nofree nonnull readonly align 8 dereferenceable(32) [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr double, double* [[PTR]], i64 3
; CHECK-NEXT:    [[T3:%.*]] = load double, double* [[ARRAYIDX3]], align 8
; CHECK-NEXT:    ret double [[T3]]
;

  %arrayidx1 = getelementptr double, double* %ptr, i64 1
  %arrayidx2 = getelementptr double, double* %ptr, i64 2
  %arrayidx3 = getelementptr double, double* %ptr, i64 3

  %t0 = load double, double* %ptr, align 8
  %t1 = load double, double* %arrayidx1, align 8
  %t2 = load double, double* %arrayidx2, align 8
  %t3 = load double, double* %arrayidx3, align 8

  ret double %t3
}

; Unsimplified, but still valid. Also, throw in some bogus arguments.

define void @gep0(i8* %unused, i8* %other, i8* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@gep0
; CHECK-SAME: (i8* nocapture nofree readnone [[UNUSED:%.*]], i8* nocapture nofree nonnull writeonly dereferenceable(1) [[OTHER:%.*]], i8* nocapture nofree nonnull readonly dereferenceable(3) [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr i8, i8* [[PTR]], i64 2
; CHECK-NEXT:    [[T2:%.*]] = load i8, i8* [[ARRAYIDX2]], align 1
; CHECK-NEXT:    store i8 [[T2]], i8* [[OTHER]], align 1
; CHECK-NEXT:    ret void
;
  %arrayidx0 = getelementptr i8, i8* %ptr, i64 0
  %arrayidx1 = getelementptr i8, i8* %ptr, i64 1
  %arrayidx2 = getelementptr i8, i8* %ptr, i64 2
  %t0 = load i8, i8* %arrayidx0
  %t1 = load i8, i8* %arrayidx1
  %t2 = load i8, i8* %arrayidx2
  store i8 %t2, i8* %other
  ret void
}

; Order of accesses does not change computation.
; Multiple arguments may be dereferenceable.

define void @ordering(i8* %ptr1, i32* %ptr2) {
; CHECK-LABEL: define {{[^@]+}}@ordering
; CHECK-SAME: (i8* nocapture nofree nonnull readnone dereferenceable(3) [[PTR1:%.*]], i32* nocapture nofree nonnull readnone align 4 dereferenceable(8) [[PTR2:%.*]])
; CHECK-NEXT:    ret void
;
  %a20 = getelementptr i32, i32* %ptr2, i64 0
  %a12 = getelementptr i8, i8* %ptr1, i64 2
  %t12 = load i8, i8* %a12
  %a11 = getelementptr i8, i8* %ptr1, i64 1
  %t20 = load i32, i32* %a20
  %a10 = getelementptr i8, i8* %ptr1, i64 0
  %t10 = load i8, i8* %a10
  %t11 = load i8, i8* %a11
  %a21 = getelementptr i32, i32* %ptr2, i64 1
  %t21 = load i32, i32* %a21
  ret void
}

; Not in entry block.

define void @not_entry_but_guaranteed_to_execute(i8* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@not_entry_but_guaranteed_to_execute
; CHECK-SAME: (i8* nocapture nofree nonnull readnone dereferenceable(3) [[PTR:%.*]])
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %exit
exit:
  %arrayidx0 = getelementptr i8, i8* %ptr, i64 0
  %arrayidx1 = getelementptr i8, i8* %ptr, i64 1
  %arrayidx2 = getelementptr i8, i8* %ptr, i64 2
  %t0 = load i8, i8* %arrayidx0
  %t1 = load i8, i8* %arrayidx1
  %t2 = load i8, i8* %arrayidx2
  ret void
}

; Not in entry block and not guaranteed to execute.

define void @not_entry_not_guaranteed_to_execute(i8* %ptr, i1 %cond) {
; CHECK-LABEL: define {{[^@]+}}@not_entry_not_guaranteed_to_execute
; CHECK-SAME: (i8* nocapture nofree readnone [[PTR:%.*]], i1 [[COND:%.*]])
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND]], label [[LOADS:%.*]], label [[EXIT:%.*]]
; CHECK:       loads:
; CHECK-NEXT:    ret void
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cond, label %loads, label %exit
loads:
  %arrayidx0 = getelementptr i8, i8* %ptr, i64 0
  %arrayidx1 = getelementptr i8, i8* %ptr, i64 1
  %arrayidx2 = getelementptr i8, i8* %ptr, i64 2
  %t0 = load i8, i8* %arrayidx0
  %t1 = load i8, i8* %arrayidx1
  %t2 = load i8, i8* %arrayidx2
  ret void
exit:
  ret void
}

; The last load may not execute, so derefenceable bytes only covers the 1st two loads.

define void @partial_in_entry(i16* %ptr, i1 %cond) {
; CHECK-LABEL: define {{[^@]+}}@partial_in_entry
; CHECK-SAME: (i16* nocapture nofree nonnull readnone align 2 dereferenceable(4) [[PTR:%.*]], i1 [[COND:%.*]])
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND]], label [[LOADS:%.*]], label [[EXIT:%.*]]
; CHECK:       loads:
; CHECK-NEXT:    ret void
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %arrayidx0 = getelementptr i16, i16* %ptr, i64 0
  %arrayidx1 = getelementptr i16, i16* %ptr, i64 1
  %arrayidx2 = getelementptr i16, i16* %ptr, i64 2
  %t0 = load i16, i16* %arrayidx0
  %t1 = load i16, i16* %arrayidx1
  br i1 %cond, label %loads, label %exit
loads:
  %t2 = load i16, i16* %arrayidx2
  ret void
exit:
  ret void
}

; The volatile load can't be used to prove a non-volatile access is allowed.
; The 2nd and 3rd loads may never execute.

define void @volatile_is_not_dereferenceable(i16* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@volatile_is_not_dereferenceable
; CHECK-SAME: (i16* nofree align 2 [[PTR:%.*]])
; CHECK-NEXT:    [[ARRAYIDX0:%.*]] = getelementptr i16, i16* [[PTR]], i64 0
; CHECK-NEXT:    [[T0:%.*]] = load volatile i16, i16* [[ARRAYIDX0]], align 2
; CHECK-NEXT:    ret void
;
  %arrayidx0 = getelementptr i16, i16* %ptr, i64 0
  %arrayidx1 = getelementptr i16, i16* %ptr, i64 1
  %arrayidx2 = getelementptr i16, i16* %ptr, i64 2
  %t0 = load volatile i16, i16* %arrayidx0
  %t1 = load i16, i16* %arrayidx1
  %t2 = load i16, i16* %arrayidx2
  ret void
}

; TODO: We should allow inference for atomic (but not volatile) ops.

define void @atomic_is_alright(i16* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@atomic_is_alright
; CHECK-SAME: (i16* nocapture nofree nonnull readnone align 2 dereferenceable(6) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx0 = getelementptr i16, i16* %ptr, i64 0
  %arrayidx1 = getelementptr i16, i16* %ptr, i64 1
  %arrayidx2 = getelementptr i16, i16* %ptr, i64 2
  %t0 = load atomic i16, i16* %arrayidx0 unordered, align 2
  %t1 = load i16, i16* %arrayidx1
  %t2 = load i16, i16* %arrayidx2
  ret void
}

declare void @may_not_return()

define void @not_guaranteed_to_transfer_execution(i16* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@not_guaranteed_to_transfer_execution
; CHECK-SAME: (i16* nocapture nofree nonnull readnone align 2 dereferenceable(2) [[PTR:%.*]])
; CHECK-NEXT:    call void @may_not_return()
; CHECK-NEXT:    ret void
;
  %arrayidx0 = getelementptr i16, i16* %ptr, i64 0
  %arrayidx1 = getelementptr i16, i16* %ptr, i64 1
  %arrayidx2 = getelementptr i16, i16* %ptr, i64 2
  %t0 = load i16, i16* %arrayidx0
  call void @may_not_return()
  %t1 = load i16, i16* %arrayidx1
  %t2 = load i16, i16* %arrayidx2
  ret void
}

; We must have consecutive accesses.

define void @variable_gep_index(i8* %unused, i8* %ptr, i64 %variable_index) {
; CHECK-LABEL: define {{[^@]+}}@variable_gep_index
; CHECK-SAME: (i8* nocapture nofree readnone [[UNUSED:%.*]], i8* nocapture nofree nonnull readnone dereferenceable(1) [[PTR:%.*]], i64 [[VARIABLE_INDEX:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx1 = getelementptr i8, i8* %ptr, i64 %variable_index
  %arrayidx2 = getelementptr i8, i8* %ptr, i64 2
  %t0 = load i8, i8* %ptr
  %t1 = load i8, i8* %arrayidx1
  %t2 = load i8, i8* %arrayidx2
  ret void
}

; Deal with >1 GEP index.

define void @multi_index_gep(<4 x i8>* %ptr) {
; FIXME: %ptr should be dereferenceable(4)
; CHECK-LABEL: define {{[^@]+}}@multi_index_gep
; CHECK-SAME: (<4 x i8>* nocapture nofree nonnull readnone dereferenceable(1) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx00 = getelementptr <4 x i8>, <4 x i8>* %ptr, i64 0, i64 0
  %t0 = load i8, i8* %arrayidx00
  ret void
}

; Could round weird bitwidths down?

define void @not_byte_multiple(i9* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@not_byte_multiple
; CHECK-SAME: (i9* nocapture nofree nonnull readnone align 2 dereferenceable(2) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx0 = getelementptr i9, i9* %ptr, i64 0
  %t0 = load i9, i9* %arrayidx0
  ret void
}

; Missing direct access from the pointer.

define void @no_pointer_deref(i16* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@no_pointer_deref
; CHECK-SAME: (i16* nocapture nofree readnone align 2 [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx1 = getelementptr i16, i16* %ptr, i64 1
  %arrayidx2 = getelementptr i16, i16* %ptr, i64 2
  %t1 = load i16, i16* %arrayidx1
  %t2 = load i16, i16* %arrayidx2
  ret void
}

; Out-of-order is ok, but missing access concludes dereferenceable range.

define void @non_consecutive(i32* %ptr) {
; CHECK-LABEL: define {{[^@]+}}@non_consecutive
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(8) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx1 = getelementptr i32, i32* %ptr, i64 1
  %arrayidx0 = getelementptr i32, i32* %ptr, i64 0
  %arrayidx3 = getelementptr i32, i32* %ptr, i64 3
  %t1 = load i32, i32* %arrayidx1
  %t0 = load i32, i32* %arrayidx0
  %t3 = load i32, i32* %arrayidx3
  ret void
}

; Improve on existing dereferenceable attribute.

define void @more_bytes(i32* dereferenceable(8) %ptr) {
; CHECK-LABEL: define {{[^@]+}}@more_bytes
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(16) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx3 = getelementptr i32, i32* %ptr, i64 3
  %arrayidx1 = getelementptr i32, i32* %ptr, i64 1
  %arrayidx0 = getelementptr i32, i32* %ptr, i64 0
  %arrayidx2 = getelementptr i32, i32* %ptr, i64 2
  %t3 = load i32, i32* %arrayidx3
  %t1 = load i32, i32* %arrayidx1
  %t2 = load i32, i32* %arrayidx2
  %t0 = load i32, i32* %arrayidx0
  ret void
}

; Improve on existing dereferenceable_or_null attribute.

define void @more_bytes_and_not_null(i32* dereferenceable_or_null(8) %ptr) {
; CHECK-LABEL: define {{[^@]+}}@more_bytes_and_not_null
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(16) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx3 = getelementptr i32, i32* %ptr, i64 3
  %arrayidx1 = getelementptr i32, i32* %ptr, i64 1
  %arrayidx0 = getelementptr i32, i32* %ptr, i64 0
  %arrayidx2 = getelementptr i32, i32* %ptr, i64 2
  %t3 = load i32, i32* %arrayidx3
  %t1 = load i32, i32* %arrayidx1
  %t2 = load i32, i32* %arrayidx2
  %t0 = load i32, i32* %arrayidx0
  ret void
}

; But don't pessimize existing dereferenceable attribute.

define void @better_bytes(i32* dereferenceable(100) %ptr) {
; CHECK-LABEL: define {{[^@]+}}@better_bytes
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(100) [[PTR:%.*]])
; CHECK-NEXT:    ret void
;
  %arrayidx3 = getelementptr i32, i32* %ptr, i64 3
  %arrayidx1 = getelementptr i32, i32* %ptr, i64 1
  %arrayidx0 = getelementptr i32, i32* %ptr, i64 0
  %arrayidx2 = getelementptr i32, i32* %ptr, i64 2
  %t3 = load i32, i32* %arrayidx3
  %t1 = load i32, i32* %arrayidx1
  %t2 = load i32, i32* %arrayidx2
  %t0 = load i32, i32* %arrayidx0
  ret void
}

define void @bitcast(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@bitcast
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(8) [[ARG:%.*]])
; CHECK-NEXT:    ret void
;
  %ptr = bitcast i32* %arg to float*
  %arrayidx0 = getelementptr float, float* %ptr, i64 0
  %arrayidx1 = getelementptr float, float* %ptr, i64 1
  %t0 = load float, float* %arrayidx0
  %t1 = load float, float* %arrayidx1
  ret void
}

define void @bitcast_different_sizes(double* %arg1, i8* %arg2) {
; CHECK-LABEL: define {{[^@]+}}@bitcast_different_sizes
; CHECK-SAME: (double* nocapture nofree nonnull readnone align 4 dereferenceable(12) [[ARG1:%.*]], i8* nocapture nofree nonnull readnone align 4 dereferenceable(16) [[ARG2:%.*]])
; CHECK-NEXT:    ret void
;
  %ptr1 = bitcast double* %arg1 to float*
  %a10 = getelementptr float, float* %ptr1, i64 0
  %a11 = getelementptr float, float* %ptr1, i64 1
  %a12 = getelementptr float, float* %ptr1, i64 2
  %ld10 = load float, float* %a10
  %ld11 = load float, float* %a11
  %ld12 = load float, float* %a12

  %ptr2 = bitcast i8* %arg2 to i64*
  %a20 = getelementptr i64, i64* %ptr2, i64 0
  %a21 = getelementptr i64, i64* %ptr2, i64 1
  %ld20 = load i64, i64* %a20
  %ld21 = load i64, i64* %a21
  ret void
}

define void @negative_offset(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@negative_offset
; CHECK-SAME: (i32* nocapture nofree nonnull readnone align 4 dereferenceable(4) [[ARG:%.*]])
; CHECK-NEXT:    ret void
;
  %ptr = bitcast i32* %arg to float*
  %arrayidx0 = getelementptr float, float* %ptr, i64 0
  %arrayidx1 = getelementptr float, float* %ptr, i64 -1
  %t0 = load float, float* %arrayidx0
  %t1 = load float, float* %arrayidx1
  ret void
}

define void @stores(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@stores
; CHECK-SAME: (i32* nocapture nofree nonnull writeonly align 4 dereferenceable(8) [[ARG:%.*]])
; CHECK-NEXT:    [[PTR:%.*]] = bitcast i32* [[ARG]] to float*
; CHECK-NEXT:    [[ARRAYIDX0:%.*]] = getelementptr float, float* [[PTR]], i64 0
; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr float, float* [[PTR]], i64 1
; CHECK-NEXT:    store float 1.000000e+00, float* [[ARRAYIDX0]], align 4
; CHECK-NEXT:    store float 2.000000e+00, float* [[ARRAYIDX1]], align 4
; CHECK-NEXT:    ret void
;
  %ptr = bitcast i32* %arg to float*
  %arrayidx0 = getelementptr float, float* %ptr, i64 0
  %arrayidx1 = getelementptr float, float* %ptr, i64 1
  store float 1.0, float* %arrayidx0
  store float 2.0, float* %arrayidx1
  ret void
}

define void @load_store(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@load_store
; CHECK-SAME: (i32* nocapture nofree nonnull writeonly align 4 dereferenceable(8) [[ARG:%.*]])
; CHECK-NEXT:    [[PTR:%.*]] = bitcast i32* [[ARG]] to float*
; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr float, float* [[PTR]], i64 1
; CHECK-NEXT:    store float 2.000000e+00, float* [[ARRAYIDX1]], align 4
; CHECK-NEXT:    ret void
;
  %ptr = bitcast i32* %arg to float*
  %arrayidx0 = getelementptr float, float* %ptr, i64 0
  %arrayidx1 = getelementptr float, float* %ptr, i64 1
  %t1 = load float, float* %arrayidx0
  store float 2.0, float* %arrayidx1
  ret void
}

define void @different_size1(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@different_size1
; CHECK-SAME: (i32* nocapture nofree nonnull writeonly align 8 dereferenceable(8) [[ARG:%.*]])
; CHECK-NEXT:    [[ARG_CAST:%.*]] = bitcast i32* [[ARG]] to double*
; CHECK-NEXT:    store double 0.000000e+00, double* [[ARG_CAST]], align 8
; CHECK-NEXT:    store i32 0, i32* [[ARG]], align 8
; CHECK-NEXT:    ret void
;
  %arg-cast = bitcast i32* %arg to double*
  store double 0.000000e+00, double* %arg-cast
  store i32 0, i32* %arg
  ret void
}

define void @different_size2(i32* %arg) {
; CHECK-LABEL: define {{[^@]+}}@different_size2
; CHECK-SAME: (i32* nocapture nofree nonnull writeonly align 8 dereferenceable(8) [[ARG:%.*]])
; CHECK-NEXT:    store i32 0, i32* [[ARG]], align 8
; CHECK-NEXT:    [[ARG_CAST:%.*]] = bitcast i32* [[ARG]] to double*
; CHECK-NEXT:    store double 0.000000e+00, double* [[ARG_CAST]], align 8
; CHECK-NEXT:    ret void
;
  store i32 0, i32* %arg
  %arg-cast = bitcast i32* %arg to double*
  store double 0.000000e+00, double* %arg-cast
  ret void
}

; Make use of MustBeExecuted Explorer
;
; [CFG]
; entry
;  / \
; l1 l2
; | X |
; l3 l4
;  \ /
;  l5
;  / \
; l6 l7
;  \ /
;  end
; According to the above CFG, we can see that instructions in l5 Block must be executed.
; Therefore, %p must be dereferenced.
;
; ATTRIBUTOR_CGSCC_NPM-LABEL: define i32 @require_cfg_analysis(i32 %c, i32* {{.*}} dereferenceable(4) %p)
define i32 @require_cfg_analysis(i32 %c, i32* %p) {
; IS________OPM-LABEL: define {{[^@]+}}@require_cfg_analysis
; IS________OPM-SAME: (i32 [[C:%.*]], i32* nocapture nofree writeonly [[P:%.*]])
; IS________OPM-NEXT:    [[TOBOOL1:%.*]] = icmp eq i32 [[C]], 0
; IS________OPM-NEXT:    br i1 [[TOBOOL1]], label [[L1:%.*]], label [[L2:%.*]]
; IS________OPM:       l1:
; IS________OPM-NEXT:    [[TOBOOL2:%.*]] = icmp eq i32 [[C]], 1
; IS________OPM-NEXT:    br i1 [[TOBOOL2]], label [[L3:%.*]], label [[L4:%.*]]
; IS________OPM:       l2:
; IS________OPM-NEXT:    [[TOBOOL3:%.*]] = icmp eq i32 [[C]], 2
; IS________OPM-NEXT:    br i1 [[TOBOOL3]], label [[L3]], label [[L4]]
; IS________OPM:       l3:
; IS________OPM-NEXT:    br label [[L5:%.*]]
; IS________OPM:       l4:
; IS________OPM-NEXT:    br label [[L5]]
; IS________OPM:       l5:
; IS________OPM-NEXT:    [[TOBOOL4:%.*]] = icmp eq i32 [[C]], 4
; IS________OPM-NEXT:    br i1 [[TOBOOL4]], label [[L6:%.*]], label [[L7:%.*]]
; IS________OPM:       l6:
; IS________OPM-NEXT:    store i32 0, i32* [[P]], align 4
; IS________OPM-NEXT:    br label [[END:%.*]]
; IS________OPM:       l7:
; IS________OPM-NEXT:    store i32 1, i32* [[P]], align 4
; IS________OPM-NEXT:    br label [[END]]
; IS________OPM:       end:
; IS________OPM-NEXT:    ret i32 1
;
; IS________NPM-LABEL: define {{[^@]+}}@require_cfg_analysis
; IS________NPM-SAME: (i32 [[C:%.*]], i32* nocapture nofree nonnull writeonly align 4 dereferenceable(4) [[P:%.*]])
; IS________NPM-NEXT:    [[TOBOOL1:%.*]] = icmp eq i32 [[C]], 0
; IS________NPM-NEXT:    br i1 [[TOBOOL1]], label [[L1:%.*]], label [[L2:%.*]]
; IS________NPM:       l1:
; IS________NPM-NEXT:    br label [[L4:%.*]]
; IS________NPM:       l2:
; IS________NPM-NEXT:    [[TOBOOL3:%.*]] = icmp eq i32 [[C]], 2
; IS________NPM-NEXT:    br i1 [[TOBOOL3]], label [[L3:%.*]], label [[L4]]
; IS________NPM:       l3:
; IS________NPM-NEXT:    br label [[L5:%.*]]
; IS________NPM:       l4:
; IS________NPM-NEXT:    br label [[L5]]
; IS________NPM:       l5:
; IS________NPM-NEXT:    [[TOBOOL4:%.*]] = icmp eq i32 [[C]], 4
; IS________NPM-NEXT:    br i1 [[TOBOOL4]], label [[L6:%.*]], label [[L7:%.*]]
; IS________NPM:       l6:
; IS________NPM-NEXT:    store i32 0, i32* [[P]], align 4
; IS________NPM-NEXT:    br label [[END:%.*]]
; IS________NPM:       l7:
; IS________NPM-NEXT:    store i32 1, i32* [[P]], align 4
; IS________NPM-NEXT:    br label [[END]]
; IS________NPM:       end:
; IS________NPM-NEXT:    ret i32 1
;
  %tobool1 = icmp eq i32 %c, 0
  br i1 %tobool1, label %l1, label %l2
l1:
  %tobool2 = icmp eq i32 %c, 1
  br i1 %tobool2, label %l3, label %l4
l2:
  %tobool3 = icmp eq i32 %c, 2
  br i1 %tobool3, label %l3, label %l4
l3:
  br label %l5
l4:
  br label %l5
l5:
  %tobool4 = icmp eq i32 %c, 4
  br i1 %tobool4, label %l6, label %l7
l6:
  store i32 0, i32* %p
  br label %end
l7:
  store i32 1, i32* %p
  br label %end
end:
  ret i32 1
}