llvm/test/Transforms/InstSimplify/load.ll

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

@zeroinit = constant {} zeroinitializer
@poison = constant {} poison
@constzeroarray = internal constant [4 x i32] zeroinitializer

define i32 @crash_on_zeroinit() {
; CHECK-LABEL: @crash_on_zeroinit(
; CHECK-NEXT:    ret i32 poison
;
  %load = load i32, ptr @zeroinit
  ret i32 %load
}

define i32 @crash_on_poison() {
; CHECK-LABEL: @crash_on_poison(
; CHECK-NEXT:    ret i32 poison
;
  %load = load i32, ptr @poison
  ret i32 %load
}

@GV = private constant [8 x i32] [i32 42, i32 43, i32 44, i32 45, i32 46, i32 47, i32 48, i32 49]

define <8 x i32> @partial_load() {
; CHECK-LABEL: @partial_load(
; CHECK-NEXT:    ret <8 x i32> <i32 0, i32 42, i32 43, i32 44, i32 45, i32 46, i32 47, i32 48>
;
  %load = load <8 x i32>, ptr getelementptr ([8 x i32], ptr @GV, i64 0, i64 -1)
  ret <8 x i32> %load
}

@constvec = internal constant <3 x float> <float 0xBFDA20BC40000000, float 0xBFE6A09EE0000000, float 0x3FE279A760000000>

; This does an out of bounds load from the global constant
define <3 x float> @load_vec3() {
; CHECK-LABEL: @load_vec3(
; CHECK-NEXT:    ret <3 x float> poison
;
  %1 = load <3 x float>, ptr getelementptr inbounds (<3 x float>, ptr @constvec, i64 1)
  ret <3 x float> %1
}

define i32 @load_gep_const_zero_array(i64 %idx) {
; CHECK-LABEL: @load_gep_const_zero_array(
; CHECK-NEXT:    ret i32 0
;
  %gep = getelementptr inbounds [4 x i32], ptr @constzeroarray, i64 0, i64 %idx
  %load = load i32, ptr %gep
  ret i32 %load
}

define i8 @load_i8_multi_gep_const_zero_array(i64 %idx1, i64 %idx2) {
; CHECK-LABEL: @load_i8_multi_gep_const_zero_array(
; CHECK-NEXT:    ret i8 0
;
  %gep1 = getelementptr inbounds i8, ptr @constzeroarray, i64 %idx1
  %gep = getelementptr inbounds i8, ptr %gep1, i64 %idx2
  %load = load i8, ptr %gep
  ret i8 %load
}

@allones_i32 = constant i32 -1

define b8 @load_b8_from_allones_i32() {
; CHECK-LABEL: @load_b8_from_allones_i32(
; CHECK-NEXT:    ret b8 -1
;
  %load = load b8, ptr @allones_i32
  ret b8 %load
}

define b8 @load_b8_from_i32_constant() {
; CHECK-LABEL: @load_b8_from_i32_constant(
; CHECK-NEXT:    ret b8 42
;
  %load = load b8, ptr @GV
  ret b8 %load
}

define b8 @load_b8_from_fp_constant() {
; CHECK-LABEL: @load_b8_from_fp_constant(
; CHECK-NEXT:    ret b8 -30
;
  %load = load b8, ptr @constvec
  ret b8 %load
}

define <4 x b8> @load_vb8_from_allones_gep(i64 %idx) {
; CHECK-LABEL: @load_vb8_from_allones_gep(
; CHECK-NEXT:    ret <4 x b8> splat (b8 -1)
;
  %gep = getelementptr i8, ptr @allones_i32, i64 %idx
  %load = load <4 x b8>, ptr %gep
  ret <4 x b8> %load
}

@allones_ptr = constant ptr inttoptr (i64 -1 to ptr)
@ptr_to_GV = constant ptr @GV
@struct_inttoptr = constant { ptr, i8 } { ptr inttoptr (i64 -1 to ptr), i8 7 }
@null_ptr = constant ptr null

define b8 @load_b8_from_inttoptr() {
; CHECK-LABEL: @load_b8_from_inttoptr(
; CHECK-NEXT:    [[LOAD:%.*]] = load b8, ptr @allones_ptr, align 1
; CHECK-NEXT:    ret b8 [[LOAD]]
;
  %load = load b8, ptr @allones_ptr
  ret b8 %load
}

define <4 x b8> @load_vb8_from_inttoptr() {
; CHECK-LABEL: @load_vb8_from_inttoptr(
; CHECK-NEXT:    [[LOAD:%.*]] = load <4 x b8>, ptr @allones_ptr, align 4
; CHECK-NEXT:    ret <4 x b8> [[LOAD]]
;
  %load = load <4 x b8>, ptr @allones_ptr
  ret <4 x b8> %load
}

define <4 x b8> @load_vb8_from_allones_ptr_gep(i64 %idx) {
; CHECK-LABEL: @load_vb8_from_allones_ptr_gep(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr @allones_ptr, i64 [[IDX:%.*]]
; CHECK-NEXT:    [[LOAD:%.*]] = load <4 x b8>, ptr [[GEP]], align 4
; CHECK-NEXT:    ret <4 x b8> [[LOAD]]
;
  %gep = getelementptr i8, ptr @allones_ptr, i64 %idx
  %load = load <4 x b8>, ptr %gep
  ret <4 x b8> %load
}

define b8 @load_b8_from_struct_inttoptr() {
; CHECK-LABEL: @load_b8_from_struct_inttoptr(
; CHECK-NEXT:    [[LOAD:%.*]] = load b8, ptr @struct_inttoptr, align 1
; CHECK-NEXT:    ret b8 [[LOAD]]
;
  %load = load b8, ptr @struct_inttoptr
  ret b8 %load
}

define b8 @load_b8_from_struct_after_inttoptr() {
; CHECK-LABEL: @load_b8_from_struct_after_inttoptr(
; CHECK-NEXT:    ret b8 7
;
  %gep = getelementptr inbounds i8, ptr @struct_inttoptr, i64 8
  %load = load b8, ptr %gep
  ret b8 %load
}

define b64 @load_b64_from_ptr() {
; CHECK-LABEL: @load_b64_from_ptr(
; CHECK-NEXT:    ret b64 bitcast (ptr @GV to b64)
;
  %load = load b64, ptr @ptr_to_GV
  ret b64 %load
}

define b8 @load_b8_from_null_ptr() {
; CHECK-LABEL: @load_b8_from_null_ptr(
; CHECK-NEXT:    ret b8 0
;
  %load = load b8, ptr @null_ptr
  ret b8 %load
}