test/Transforms/SROA/preserve-metadata.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes='sroa<preserve-cfg>' -S | FileCheck %s --check-prefixes=CHECK,CHECK-PRESERVE-CFG
; RUN: opt < %s -passes='sroa<modify-cfg>' -S | FileCheck %s --check-prefixes=CHECK,CHECK-MODIFY-CFG
;
; Make sure that SROA doesn't lose nonnull metadata
; on loads from allocas that get optimized out.

declare void @llvm.memcpy.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1)

; Check that we do basic propagation of nonnull when rewriting.
define ptr @propagate_nonnull(ptr %v) {
; CHECK-LABEL: @propagate_nonnull(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A_SROA_1:%.*]] = alloca ptr, align 8
; CHECK-NEXT:    store ptr [[V:%.*]], ptr [[A_SROA_1]], align 8
; CHECK-NEXT:    [[A_SROA_1_0_A_SROA_1_8_LOAD:%.*]] = load volatile ptr, ptr [[A_SROA_1]], align 8, !nonnull !0
; CHECK-NEXT:    ret ptr [[A_SROA_1_0_A_SROA_1_8_LOAD]]
;
entry:
  %a = alloca [2 x ptr]
  %a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
  store ptr %v, ptr %a.gep1
  store ptr null, ptr %a
  %load = load volatile ptr, ptr %a.gep1, !nonnull !0
  ret ptr %load
}

define i32 @propagate_range(i32 %v) {
; CHECK-LABEL: @propagate_range(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A_SROA_1:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 [[V:%.*]], ptr [[A_SROA_1]], align 4
; CHECK-NEXT:    [[A_SROA_1_0_A_SROA_1_4_LOAD:%.*]] = load volatile i32, ptr [[A_SROA_1]], align 4, !range [[RNG1:![0-9]+]]
; CHECK-NEXT:    ret i32 [[A_SROA_1_0_A_SROA_1_4_LOAD]]
;
entry:
  %a = alloca [2 x i32]
  %a.gep1 = getelementptr [2 x i32], ptr %a, i32 0, i32 1
  store i32 %v, ptr %a.gep1
  store i32 0, ptr %a
  %load = load volatile i32, ptr %a.gep1, !range !{i32 0, i32 10}
  ret i32 %load
}

define ptr @propagate_noundef(ptr %v) {
; CHECK-LABEL: @propagate_noundef(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A_SROA_1:%.*]] = alloca ptr, align 8
; CHECK-NEXT:    store ptr [[V:%.*]], ptr [[A_SROA_1]], align 8
; CHECK-NEXT:    [[A_SROA_1_0_A_SROA_1_8_LOAD:%.*]] = load volatile ptr, ptr [[A_SROA_1]], align 8, !noundef !0
; CHECK-NEXT:    ret ptr [[A_SROA_1_0_A_SROA_1_8_LOAD]]
;
entry:
  %a = alloca [2 x ptr]
  %a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
  store ptr %v, ptr %a.gep1
  store ptr null, ptr %a
  %load = load volatile ptr, ptr %a.gep1, !noundef !0
  ret ptr %load
}

define ptr @turn_nonnull_noundef_into_assume(ptr %arg) {
; CHECK-LABEL: @turn_nonnull_noundef_into_assume(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[BUF_0_COPYLOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ne ptr [[BUF_0_COPYLOAD]], null
; CHECK-NEXT:    call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT:    ret ptr [[BUF_0_COPYLOAD]]
;
entry:
  %buf = alloca ptr
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %buf, ptr align 8 %arg, i64 8, i1 false)
  %ret = load ptr, ptr %buf, align 8, !nonnull !0, !noundef !0
  ret ptr %ret
}

define ptr @dont_turn_nonnull_without_noundef_into_assume(ptr %arg) {
; CHECK-LABEL: @dont_turn_nonnull_without_noundef_into_assume(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[BUF_0_COPYLOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
; CHECK-NEXT:    ret ptr [[BUF_0_COPYLOAD]]
;
entry:
  %buf = alloca ptr
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %buf, ptr align 8 %arg, i64 8, i1 false)
  %ret = load ptr, ptr %buf, align 8, !nonnull !0
  ret ptr %ret
}

; Make sure we properly handle the !nonnull attribute when we convert
; a pointer load to an integer load.
; FIXME: While this doesn't do anythnig actively harmful today, it really
; should propagate the !nonnull metadata to range metadata. The irony is, it
; *does* initially, but then we lose that !range metadata before we finish
; SROA.
define ptr @propagate_nonnull_to_int() {
; CHECK-LABEL: @propagate_nonnull_to_int(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A_SROA_1:%.*]] = alloca ptr, align 8
; CHECK-NEXT:    store ptr inttoptr (i64 42 to ptr), ptr [[A_SROA_1]], align 8
; CHECK-NEXT:    [[A_SROA_1_0_A_SROA_1_8_LOAD:%.*]] = load volatile ptr, ptr [[A_SROA_1]], align 8, !nonnull !0
; CHECK-NEXT:    ret ptr [[A_SROA_1_0_A_SROA_1_8_LOAD]]
;
entry:
  %a = alloca [2 x ptr]
  %a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
  store i64 42, ptr %a.gep1
  store i64 0, ptr %a
  %load = load volatile ptr, ptr %a.gep1, !nonnull !0
  ret ptr %load
}

; Make sure we properly handle the !nonnull attribute when we convert
; a pointer load to an integer load and immediately promote it to an SSA
; register. This can fail in interesting ways due to the rewrite iteration of
; SROA, resulting in PR32902.
define ptr @propagate_nonnull_to_int_and_promote() {
; CHECK-LABEL: @propagate_nonnull_to_int_and_promote(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    ret ptr inttoptr (i64 42 to ptr)
;
entry:
  %a = alloca [2 x ptr], align 8
  %a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
  store i64 42, ptr %a.gep1
  store i64 0, ptr %a
  %load = load ptr, ptr %a.gep1, align 8, !nonnull !0
  ret ptr %load
}

define i128 @load_i128_to_load_ptr() {
; CHECK-LABEL: @load_i128_to_load_ptr(
; CHECK-NEXT:    [[TMP1:%.*]] = ptrtoint ptr null to i64
; CHECK-NEXT:    [[A_SROA_2_0_INSERT_EXT:%.*]] = zext i64 undef to i128
; CHECK-NEXT:    [[A_SROA_2_0_INSERT_SHIFT:%.*]] = shl i128 [[A_SROA_2_0_INSERT_EXT]], 64
; CHECK-NEXT:    [[A_SROA_2_0_INSERT_MASK:%.*]] = and i128 undef, 18446744073709551615
; CHECK-NEXT:    [[A_SROA_2_0_INSERT_INSERT:%.*]] = or i128 [[A_SROA_2_0_INSERT_MASK]], [[A_SROA_2_0_INSERT_SHIFT]]
; CHECK-NEXT:    [[A_SROA_0_0_INSERT_EXT:%.*]] = zext i64 [[TMP1]] to i128
; CHECK-NEXT:    [[A_SROA_0_0_INSERT_MASK:%.*]] = and i128 [[A_SROA_2_0_INSERT_INSERT]], -18446744073709551616
; CHECK-NEXT:    [[A_SROA_0_0_INSERT_INSERT:%.*]] = or i128 [[A_SROA_0_0_INSERT_MASK]], [[A_SROA_0_0_INSERT_EXT]]
; CHECK-NEXT:    ret i128 [[A_SROA_0_0_INSERT_INSERT]]
;
  %a = alloca i128
  store ptr null, ptr %a
  %v = load i128, ptr %a, !range !{i128 1, i128 0}
  ret i128 %v
}

!0 = !{}
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK-MODIFY-CFG: {{.*}}
; CHECK-PRESERVE-CFG: {{.*}}