test/Transforms/InstCombine/memchr-9.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Verify that calls to memchr with arrays of elements larger than char
; are folded correctly.
; RUN: opt < %s -passes=instcombine -S -data-layout="E" | FileCheck %s --check-prefixes=CHECK,BE-CHECK
; RUN: opt < %s -passes=instcombine -S -data-layout="e" | FileCheck %s --check-prefixes=CHECK,LE-CHECK
;
; Exercise folding of memchr calls with addition expressions involving
; pointers into constant arrays of types larger than char and fractional
; offsets.

declare ptr @memchr(ptr, i32, i64)

%struct.A = type { [2 x i16], [2 x i16] }

; Hex byte representation: 00 00  01 01  02 02  03 03
@a = constant [1 x %struct.A] [%struct.A { [2 x i16] [i16 0, i16 257], [2 x i16] [i16 514, i16 771] }]


define void @fold_memchr_A_pIb_cst_cst(ptr %pchr) {
; CHECK-LABEL: @fold_memchr_A_pIb_cst_cst(
; CHECK-NEXT:    store ptr @a, ptr [[PCHR:%.*]], align 8
; CHECK-NEXT:    [[PST_0_1_1:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 1
; CHECK-NEXT:    store ptr null, ptr [[PST_0_1_1]], align 8
; CHECK-NEXT:    [[PST_0_4_4:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 2
; CHECK-NEXT:    store ptr null, ptr [[PST_0_4_4]], align 8
; CHECK-NEXT:    [[PST_1_0_1:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 3
; CHECK-NEXT:    store ptr getelementptr (i8, ptr @a, i64 1), ptr [[PST_1_0_1]], align 8
; CHECK-NEXT:    [[PST_1_0_3:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 4
; CHECK-NEXT:    store ptr getelementptr (i8, ptr @a, i64 1), ptr [[PST_1_0_3]], align 8
; CHECK-NEXT:    [[PST_1_1_1:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 5
; CHECK-NEXT:    store ptr null, ptr [[PST_1_1_1]], align 8
; CHECK-NEXT:    [[PST_1_1_2:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 6
; CHECK-NEXT:    store ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 0, i64 1), ptr [[PST_1_1_2]], align 8
; CHECK-NEXT:    [[PST_1_3_3:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 7
; CHECK-NEXT:    store ptr null, ptr [[PST_1_3_3]], align 8
; CHECK-NEXT:    [[PST_1_3_4:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 8
; CHECK-NEXT:    store ptr null, ptr [[PST_1_3_4]], align 8
; CHECK-NEXT:    [[PST_1_3_6:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 10
; CHECK-NEXT:    store ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 1), ptr [[PST_1_3_6]], align 8
; CHECK-NEXT:    ret void
;


  ; Fold memchr((char*)a + 0, '\0', 1) to a.
  %chr_0_0_1 = call ptr @memchr(ptr @a, i32 0, i64 1)
  store ptr %chr_0_0_1, ptr %pchr

  ; Fold memchr((char*)a + 0, '\01', 1) to null.
  %pst_0_1_1 = getelementptr ptr, ptr %pchr, i32 1
  %chr_0_1_1 = call ptr @memchr(ptr @a, i32 1, i64 1)
  store ptr %chr_0_1_1, ptr %pst_0_1_1

  ; Fold memchr((char*)a + 0, '\04', 4) to null.
  %pst_0_4_4 = getelementptr ptr, ptr %pchr, i32 2
  %chr_0_4_4 = call ptr @memchr(ptr @a, i32 4, i64 4)
  store ptr %chr_0_4_4, ptr %pst_0_4_4


  %pi8ap1 = getelementptr i8, ptr @a, i32 1

  ; Fold memchr((char*)a + 1, '\0', 1) to (char*)a + 1.
  %pst_1_0_1 = getelementptr ptr, ptr %pchr, i32 3
  %chr_1_0_1 = call ptr @memchr(ptr %pi8ap1, i32 0, i64 1)
  store ptr %chr_1_0_1, ptr %pst_1_0_1

  ; Fold memchr((char*)a + 1, '\0', 3) to (char*)a + 1.
  %pst_1_0_3 = getelementptr ptr, ptr %pchr, i32 4
  %chr_1_0_3 = call ptr @memchr(ptr %pi8ap1, i32 0, i64 3)
  store ptr %chr_1_0_3, ptr %pst_1_0_3

  ; Fold memchr((char*)a + 1, '\01', 1) to null.
  %pst_1_1_1 = getelementptr ptr, ptr %pchr, i32 5
  %chr_1_1_1 = call ptr @memchr(ptr %pi8ap1, i32 1, i64 1)
  store ptr %chr_1_1_1, ptr %pst_1_1_1

  ; Fold memchr((char*)a + 1, '\01', 2) to (char*)a + 2.
  %pst_1_1_2 = getelementptr ptr, ptr %pchr, i32 6
  %chr_1_1_2 = call ptr @memchr(ptr %pi8ap1, i32 1, i64 2)
  store ptr %chr_1_1_2, ptr %pst_1_1_2

  ; Fold memchr((char*)a + 1, '\03', 3) to null.
  %pst_1_3_3 = getelementptr ptr, ptr %pchr, i32 7
  %chr_1_3_3 = call ptr @memchr(ptr %pi8ap1, i32 3, i64 3)
  store ptr %chr_1_3_3, ptr %pst_1_3_3

  ; Fold memchr((char*)a + 1, '\03', 4) to null.
  %pst_1_3_4 = getelementptr ptr, ptr %pchr, i32 8
  %chr_1_3_4 = call ptr @memchr(ptr %pi8ap1, i32 3, i64 4)
  store ptr %chr_1_3_4, ptr %pst_1_3_4

  ; Fold memchr((char*)a + 1, '\03', 5) to null.
  %pst_1_3_5 = getelementptr ptr, ptr %pchr, i32 9
  %chr_1_3_5 = call ptr @memchr(ptr %pi8ap1, i32 3, i64 5)
  store ptr %chr_1_3_4, ptr %pst_1_3_4

  ; Fold memchr((char*)a + 1, '\03', 6) to (char*)a + 5.
  %pst_1_3_6 = getelementptr ptr, ptr %pchr, i32 10
  %chr_1_3_6 = call ptr @memchr(ptr %pi8ap1, i32 3, i64 6)
  store ptr %chr_1_3_6, ptr %pst_1_3_6


  ret void
}


define void @fold_memchr_A_pIb_cst_N(i64 %N, ptr %pchr) {
; CHECK-LABEL: @fold_memchr_A_pIb_cst_N(
; CHECK-NEXT:    [[MEMCHR_CMP:%.*]] = icmp eq i64 [[N:%.*]], 0
; CHECK-NEXT:    [[CHR_0_0_N:%.*]] = select i1 [[MEMCHR_CMP]], ptr null, ptr @a
; CHECK-NEXT:    store ptr [[CHR_0_0_N]], ptr [[PCHR:%.*]], align 8
; CHECK-NEXT:    [[PST_0_1_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 1
; CHECK-NEXT:    [[MEMCHR_CMP1:%.*]] = icmp ult i64 [[N]], 3
; CHECK-NEXT:    [[CHR_0_1_N:%.*]] = select i1 [[MEMCHR_CMP1]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 0, i64 1)
; CHECK-NEXT:    store ptr [[CHR_0_1_N]], ptr [[PST_0_1_N]], align 8
; CHECK-NEXT:    [[PST_0_4_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 2
; CHECK-NEXT:    store ptr null, ptr [[PST_0_4_N]], align 8
; CHECK-NEXT:    [[PST_1_0_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 3
; CHECK-NEXT:    [[MEMCHR_CMP2:%.*]] = icmp eq i64 [[N]], 0
; CHECK-NEXT:    [[CHR_1_0_N:%.*]] = select i1 [[MEMCHR_CMP2]], ptr null, ptr getelementptr (i8, ptr @a, i64 1)
; CHECK-NEXT:    store ptr [[CHR_1_0_N]], ptr [[PST_1_0_N]], align 8
; CHECK-NEXT:    [[PST_1_1_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 4
; CHECK-NEXT:    [[MEMCHR_CMP3:%.*]] = icmp ult i64 [[N]], 2
; CHECK-NEXT:    [[CHR_1_1_N:%.*]] = select i1 [[MEMCHR_CMP3]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 0, i64 1)
; CHECK-NEXT:    store ptr [[CHR_1_1_N]], ptr [[PST_1_1_N]], align 8
; CHECK-NEXT:    [[PST_1_2_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 5
; CHECK-NEXT:    [[MEMCHR_CMP4:%.*]] = icmp ult i64 [[N]], 4
; CHECK-NEXT:    [[CHR_1_2_N:%.*]] = select i1 [[MEMCHR_CMP4]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 0)
; CHECK-NEXT:    store ptr [[CHR_1_2_N]], ptr [[PST_1_2_N]], align 8
; CHECK-NEXT:    [[PST_1_3_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 6
; CHECK-NEXT:    [[MEMCHR_CMP5:%.*]] = icmp ult i64 [[N]], 6
; CHECK-NEXT:    [[CHR_1_3_N:%.*]] = select i1 [[MEMCHR_CMP5]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 1)
; CHECK-NEXT:    store ptr [[CHR_1_3_N]], ptr [[PST_1_3_N]], align 8
; CHECK-NEXT:    [[PST_1_4_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 7
; CHECK-NEXT:    store ptr null, ptr [[PST_1_4_N]], align 8
; CHECK-NEXT:    [[PST_2_0_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 8
; CHECK-NEXT:    store ptr null, ptr [[PST_2_0_N]], align 8
; CHECK-NEXT:    [[PST_2_1_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 9
; CHECK-NEXT:    [[MEMCHR_CMP6:%.*]] = icmp eq i64 [[N]], 0
; CHECK-NEXT:    [[CHR_2_1_N:%.*]] = select i1 [[MEMCHR_CMP6]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 0, i64 1)
; CHECK-NEXT:    store ptr [[CHR_2_1_N]], ptr [[PST_2_1_N]], align 8
; CHECK-NEXT:    [[PST_2_2_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 10
; CHECK-NEXT:    [[MEMCHR_CMP7:%.*]] = icmp ult i64 [[N]], 3
; CHECK-NEXT:    [[CHR_2_2_N:%.*]] = select i1 [[MEMCHR_CMP7]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 0)
; CHECK-NEXT:    store ptr [[CHR_2_2_N]], ptr [[PST_2_2_N]], align 8
; CHECK-NEXT:    [[PST_2_3_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 11
; CHECK-NEXT:    [[MEMCHR_CMP8:%.*]] = icmp ult i64 [[N]], 5
; CHECK-NEXT:    [[CHR_2_3_N:%.*]] = select i1 [[MEMCHR_CMP8]], ptr null, ptr getelementptr inbounds ([1 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 1)
; CHECK-NEXT:    store ptr [[CHR_2_3_N]], ptr [[PST_2_3_N]], align 8
; CHECK-NEXT:    [[PST_2_4_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 12
; CHECK-NEXT:    store ptr null, ptr [[PST_2_4_N]], align 8
; CHECK-NEXT:    ret void
;


  ; Fold memchr((char*)a + 0, '\0', N) to N ? a : null.
  %chr_0_0_n = call ptr @memchr(ptr @a, i32 0, i64 %N)
  store ptr %chr_0_0_n, ptr %pchr

  ; Fold memchr((char*)a + 0, '\01', N) to N < 2 ? null : a.
  %pst_0_1_n = getelementptr ptr, ptr %pchr, i32 1
  %chr_0_1_n = call ptr @memchr(ptr @a, i32 1, i64 %N)
  store ptr %chr_0_1_n, ptr %pst_0_1_n

  ; Fold memchr((char*)a + 0, '\04', N) to null.
  %pst_0_4_n = getelementptr ptr, ptr %pchr, i32 2
  %chr_0_4_n = call ptr @memchr(ptr @a, i32 4, i64 %N)
  store ptr %chr_0_4_n, ptr %pst_0_4_n


  %pi8ap1 = getelementptr i8, ptr @a, i32 1

  ; Fold memchr((char*)a + 1, '\0', N) to null.
  %pst_1_0_n = getelementptr ptr, ptr %pchr, i32 3
  %chr_1_0_n = call ptr @memchr(ptr %pi8ap1, i32 0, i64 %N)
  store ptr %chr_1_0_n, ptr %pst_1_0_n

  ; Fold memchr((char*)a + 1, '\01', N) N ? (char*)a + 1 : null.
  %pst_1_1_n = getelementptr ptr, ptr %pchr, i32 4
  %chr_1_1_n = call ptr @memchr(ptr %pi8ap1, i32 1, i64 %N)
  store ptr %chr_1_1_n, ptr %pst_1_1_n

  ; Fold memchr((char*)a + 1, '\02', N) to N < 2 ? null : (char*)a + 4.
  %pst_1_2_n = getelementptr ptr, ptr %pchr, i32 5
  %chr_1_2_n = call ptr @memchr(ptr %pi8ap1, i32 2, i64 %N)
  store ptr %chr_1_2_n, ptr %pst_1_2_n

  ; Fold memchr((char*)a + 1, '\03', N) to N < 6 ? null : (char*)a + 6.
  %pst_1_3_n = getelementptr ptr, ptr %pchr, i32 6
  %chr_1_3_n = call ptr @memchr(ptr %pi8ap1, i32 3, i64 %N)
  store ptr %chr_1_3_n, ptr %pst_1_3_n

  ; Fold memchr((char*)a + 1, '\04', N) to null.
  %pst_1_4_n = getelementptr ptr, ptr %pchr, i32 7
  %chr_1_4_n = call ptr @memchr(ptr %pi8ap1, i32 4, i64 %N)
  store ptr %chr_1_4_n, ptr %pst_1_4_n


  %pi8ap2 = getelementptr i8, ptr @a, i32 2

  ; Fold memchr((char*)a + 2, '\0', N) to null.
  %pst_2_0_n = getelementptr ptr, ptr %pchr, i32 8
  %chr_2_0_n = call ptr @memchr(ptr %pi8ap2, i32 0, i64 %N)
  store ptr %chr_2_0_n, ptr %pst_2_0_n

  ; Fold memchr((char*)a + 2, '\01', N) N ? (char*)a + 2 : null.
  %pst_2_1_n = getelementptr ptr, ptr %pchr, i32 9
  %chr_2_1_n = call ptr @memchr(ptr %pi8ap2, i32 1, i64 %N)
  store ptr %chr_2_1_n, ptr %pst_2_1_n

  ; Fold memchr((char*)a + 2, '\02', N) to N < 3 ? null : (char*)a + 2.
  %pst_2_2_n = getelementptr ptr, ptr %pchr, i32 10
  %chr_2_2_n = call ptr @memchr(ptr %pi8ap2, i32 2, i64 %N)
  store ptr %chr_2_2_n, ptr %pst_2_2_n

  ; Fold memchr((char*)a + 2, '\03', N) to N < 5 ? null : (char*)a + 4.
  %pst_2_3_n = getelementptr ptr, ptr %pchr, i32 11
  %chr_2_3_n = call ptr @memchr(ptr %pi8ap2, i32 3, i64 %N)
  store ptr %chr_2_3_n, ptr %pst_2_3_n

  ; Fold memchr((char*)a + 2, '\04', N) to null.
  %pst_2_4_n = getelementptr ptr, ptr %pchr, i32 12
  %chr_2_4_n = call ptr @memchr(ptr %pi8ap2, i32 4, i64 %N)
  store ptr %chr_2_4_n, ptr %pst_2_4_n

  ret void
}


; Verify that calls with out of bounds offsets are not folded.

define void @call_memchr_A_pIb_xs_cst(ptr %pchr) {
; CHECK-LABEL: @call_memchr_A_pIb_xs_cst(
; CHECK-NEXT:    [[CHR_1_0_0_2:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) getelementptr inbounds ([1 x %struct.A], ptr @a, i64 1, i64 0), i32 0, i64 2)
; CHECK-NEXT:    store ptr [[CHR_1_0_0_2]], ptr [[PCHR:%.*]], align 8
; CHECK-NEXT:    [[PST_1_0_1_2:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 1
; CHECK-NEXT:    [[CHR_1_0_1_2:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) getelementptr inbounds ([1 x %struct.A], ptr @a, i64 1, i64 0), i32 0, i64 2)
; CHECK-NEXT:    store ptr [[CHR_1_0_1_2]], ptr [[PST_1_0_1_2]], align 8
; CHECK-NEXT:    [[PST_0_0_8_2:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 2
; CHECK-NEXT:    [[CHR_0_0_8_2:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) getelementptr inbounds ([1 x %struct.A], ptr @a, i64 1, i64 0, i32 0, i64 0), i32 0, i64 2)
; CHECK-NEXT:    store ptr [[CHR_0_0_8_2]], ptr [[PST_0_0_8_2]], align 8
; CHECK-NEXT:    ret void
;
; Verify that the call isn't folded when the first GEP index is excessive.
  %pa1 = getelementptr [1 x %struct.A], ptr @a, i64 1, i64 0


  ; Don't fold memchr((char*)&a[1] + 0, '\0', 2).
  %chr_1_0_0_2 = call ptr @memchr(ptr %pa1, i32 0, i64 2)
  store ptr %chr_1_0_0_2, ptr %pchr

  %pi8a1p1 = getelementptr i8, ptr %pa1, i32 1

  ; Likewise, don't fold memchr((char*)&a[1] + 1, '\0', 2).
  %pst_1_0_1_2 = getelementptr ptr, ptr %pchr, i32 1
  %chr_1_0_1_2 = call ptr @memchr(ptr %pa1, i32 0, i64 2)
  store ptr %chr_1_0_1_2, ptr %pst_1_0_1_2

; Verify that the call isn't folded when the first GEP index is in bounds
; but the byte offset is excessive.

  %pi8a0p8 = getelementptr i8, ptr @a, i32 8

  ; Don't fold memchr((char*)&a[0] + 8, '\0', 2).
  %pst_0_0_8_2 = getelementptr ptr, ptr %pchr, i32 2
  %chr_0_0_8_2 = call ptr @memchr(ptr %pi8a0p8, i32 0, i64 2)
  store ptr %chr_0_0_8_2, ptr %pst_0_0_8_2

  ret void
}


@ai64 = constant [2 x i64] [i64 0, i64 -1]

; Verify that a memchr call with an argument consisting of three GEPs
; is folded.

define ptr @fold_memchr_gep_gep_gep() {
; CHECK-LABEL: @fold_memchr_gep_gep_gep(
; CHECK-NEXT:    ret ptr getelementptr (i16, ptr getelementptr (i32, ptr getelementptr inbounds ([2 x i64], ptr @ai64, i64 0, i64 1), i64 1), i64 1)
;

  %p8_1 = getelementptr [2 x i64], ptr @ai64, i64 0, i64 1
  %p4_1 = getelementptr i32, ptr %p8_1, i64 1

  %p2_1 = getelementptr i16, ptr %p4_1, i64 1

  %pc = call ptr @memchr(ptr %p2_1, i32 -1, i64 2)
  ret ptr %pc
}


%union.U = type { [2 x i32] }

@u = constant %union.U { [2 x i32] [i32 286331153, i32 35791394] }

; Verify memchr folding of a union member.

define ptr @fold_memchr_union_member() {
; BE-CHECK-LABEL: @fold_memchr_union_member(
; BE-CHECK-NEXT:    ret ptr getelementptr (i8, ptr @u, i64 5)
;
; LE-CHECK-LABEL: @fold_memchr_union_member(
; LE-CHECK-NEXT:    ret ptr getelementptr inbounds ([[UNION_U:%.*]], ptr @u, i64 0, i32 0, i64 1)
;
  %pi8u_p1 = getelementptr i8, ptr @u, i64 1
  %pc = call ptr @memchr(ptr %pi8u_p1, i32 34, i64 8)
  ret ptr %pc
}