llvm/test/Transforms/InstCombine/nonnull-select.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

; Passing select(cond, null, v) as nonnull should be optimized to passing v

define nonnull ptr @pr48975(ptr %.0) {
; CHECK-LABEL: @pr48975(
; CHECK-NEXT:    ret ptr [[DOT4:%.*]]
;
  %.1 = load ptr, ptr %.0, align 8
  %.2 = icmp eq ptr %.1, null
  %.4 = select i1 %.2, ptr null, ptr %.0
  ret ptr %.4
}

define nonnull ptr @nonnull_ret(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_ret(
; CHECK-NEXT:    ret ptr [[RES:%.*]]
;
  %res = select i1 %cond, ptr %p, ptr null
  ret ptr %res
}

define nonnull ptr @nonnull_ret_nullvalid(i1 %cond, ptr %p) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_ret_nullvalid(
; CHECK-NEXT:    ret ptr [[P:%.*]]
;
  %res = select i1 %cond, ptr %p, ptr null
  ret ptr %res
}

define nonnull ptr @nonnull_ret2(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_ret2(
; CHECK-NEXT:    ret ptr [[RES:%.*]]
;
  %res = select i1 %cond, ptr null, ptr %p
  ret ptr %res
}

define nonnull noundef ptr @nonnull_noundef_ret(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_noundef_ret(
; CHECK-NEXT:    ret ptr [[RES:%.*]]
;
  %res = select i1 %cond, ptr %p, ptr null
  ret ptr %res
}

define nonnull noundef ptr @nonnull_noundef_ret2(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_noundef_ret2(
; CHECK-NEXT:    ret ptr [[RES:%.*]]
;
  %res = select i1 %cond, ptr null, ptr %p
  ret ptr %res
}


define void @nonnull_call(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_call(
; CHECK-NEXT:    call void @f(ptr nonnull [[RES:%.*]])
; CHECK-NEXT:    ret void
;
  %res = select i1 %cond, ptr %p, ptr null
  call void @f(ptr nonnull %res)
  ret void
}

define void @nonnull_call_nullvalid(i1 %cond, ptr %p) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_call_nullvalid(
; CHECK-NEXT:    call void @f(ptr nonnull [[P:%.*]])
; CHECK-NEXT:    ret void
;
  %res = select i1 %cond, ptr %p, ptr null
  call void @f(ptr nonnull %res)
  ret void
}

define void @nonnull_call2(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_call2(
; CHECK-NEXT:    call void @f(ptr nonnull [[RES:%.*]])
; CHECK-NEXT:    ret void
;
  %res = select i1 %cond, ptr null, ptr %p
  call void @f(ptr nonnull %res)
  ret void
}

define void @nonnull_noundef_call(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_noundef_call(
; CHECK-NEXT:    call void @f(ptr noundef nonnull [[RES:%.*]])
; CHECK-NEXT:    ret void
;
  %res = select i1 %cond, ptr %p, ptr null
  call void @f(ptr nonnull noundef %res)
  ret void
}

define void @nonnull_noundef_call2(i1 %cond, ptr %p) {
; CHECK-LABEL: @nonnull_noundef_call2(
; CHECK-NEXT:    call void @f(ptr noundef nonnull [[RES:%.*]])
; CHECK-NEXT:    ret void
;
  %res = select i1 %cond, ptr null, ptr %p
  call void @f(ptr nonnull noundef %res)
  ret void
}

define void @nonnull_call_gep(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_call_gep(
; CHECK-NEXT:    [[PTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[PTR]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr i8, ptr %ptr, i64 %off
  call void @f(ptr nonnull %gep)
  ret void
}

define void @nonnull_call_gep_multiuse(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_call_gep_multiuse(
; CHECK-NEXT:    [[PTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    call void @f(ptr [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  call void @f(ptr nonnull %gep)
  call void @f(ptr %gep)
  ret void
}

define void @all_nonnull_call_gep_multiuse(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @all_nonnull_call_gep_multiuse(
; CHECK-NEXT:    [[PTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  call void @f(ptr nonnull %gep)
  call void @f(ptr nonnull %gep)
  ret void
}

define void @nonnull_call_gep_inbounds(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_call_gep_inbounds(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  call void @f(ptr nonnull %gep)
  ret void
}

define void @nonnull_call_gep_inbounds_nullvalid(i1 %cond, ptr %p, i64 %off) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_call_gep_inbounds_nullvalid(
; CHECK-NEXT:    [[P:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P1:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[P]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr nonnull [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  call void @f(ptr nonnull %gep)
  ret void
}

define void @nonnull_dereferenceable_call_gep(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_dereferenceable_call_gep(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[PTR:%.*]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr dereferenceable(1) [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr i8, ptr %ptr, i64 %off
  call void @f(ptr dereferenceable(1) %gep)
  ret void
}

define void @nonnull_dereferenceable_call_gep_nullvalid(i1 %cond, ptr %p, i64 %off) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_dereferenceable_call_gep_nullvalid(
; CHECK-NEXT:    [[P:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P1:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[P]], i64 [[OFF:%.*]]
; CHECK-NEXT:    call void @f(ptr dereferenceable(1) [[GEP]])
; CHECK-NEXT:    ret void
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr i8, ptr %ptr, i64 %off
  call void @f(ptr dereferenceable(1) %gep)
  ret void
}

define nonnull ptr @nonnull_ret_gep(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_ret_gep(
; CHECK-NEXT:    [[PTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[PTR]], i64 [[OFF:%.*]]
; CHECK-NEXT:    ret ptr [[GEP]]
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr i8, ptr %ptr, i64 %off
  ret ptr %gep
}

define nonnull ptr @nonnull_ret_gep_inbounds(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_ret_gep_inbounds(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 [[OFF:%.*]]
; CHECK-NEXT:    ret ptr [[GEP]]
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  ret ptr %gep
}

define nonnull ptr @nonnull_ret_gep_inbounds_nullvalid(i1 %cond, ptr %p, i64 %off) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_ret_gep_inbounds_nullvalid(
; CHECK-NEXT:    [[PTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[P:%.*]]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 [[OFF:%.*]]
; CHECK-NEXT:    ret ptr [[GEP]]
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr inbounds i8, ptr %ptr, i64 %off
  ret ptr %gep
}

define dereferenceable(1) ptr @nonnull_dereferenceable_ret_gep(i1 %cond, ptr %p, i64 %off) {
; CHECK-LABEL: @nonnull_dereferenceable_ret_gep(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[PTR:%.*]], i64 [[OFF:%.*]]
; CHECK-NEXT:    ret ptr [[GEP]]
;
  %ptr = select i1 %cond, ptr null, ptr %p
  %gep = getelementptr i8, ptr %ptr, i64 %off
  ret ptr %gep
}

declare void @f(ptr)