llvm/test/Transforms/InstCombine/sprintf-2.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Verify that calls to snprintf with members of constant structs as arguments
; are folded to constants as expected.
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

declare i32 @snprintf(ptr, i64, ptr, ...)

%struct.A = type { [5 x i8], [6 x i8], [7 x i8] }

@a = constant [2 x %struct.A] [%struct.A { [5 x i8] c"1\00\00\00\00", [6 x i8] c"12\00\00\00\00", [7 x i8] c"123\00\00\00\00" }, %struct.A { [5 x i8] c"1234\00", [6 x i8] c"12345\00", [7 x i8] c"123456\00" }]

@pcnt_s = constant [3 x i8] c"%s\00"


; Fold snprintf(0, 0, "%s", a[I].M + C) for constant I in [0, 1],
; member M in [a, b, c], and C in a valid range to a constant.

define void @fold_snprintf_member_pC(ptr %pi) {
; CHECK-LABEL: @fold_snprintf_member_pC(
; CHECK-NEXT:    store i32 1, ptr [[PI:%.*]], align 4
; CHECK-NEXT:    [[PIA0AP1:%.*]] = getelementptr i8, ptr [[PI]], i64 4
; CHECK-NEXT:    store i32 0, ptr [[PIA0AP1]], align 4
; CHECK-NEXT:    [[PIA0B:%.*]] = getelementptr i8, ptr [[PI]], i64 8
; CHECK-NEXT:    store i32 2, ptr [[PIA0B]], align 4
; CHECK-NEXT:    [[PIA0BP1:%.*]] = getelementptr i8, ptr [[PI]], i64 12
; CHECK-NEXT:    store i32 1, ptr [[PIA0BP1]], align 4
; CHECK-NEXT:    [[PIA0BP2:%.*]] = getelementptr i8, ptr [[PI]], i64 16
; CHECK-NEXT:    store i32 0, ptr [[PIA0BP2]], align 4
; CHECK-NEXT:    [[PIA0C:%.*]] = getelementptr i8, ptr [[PI]], i64 20
; CHECK-NEXT:    store i32 3, ptr [[PIA0C]], align 4
; CHECK-NEXT:    [[PIA1A:%.*]] = getelementptr i8, ptr [[PI]], i64 24
; CHECK-NEXT:    store i32 4, ptr [[PIA1A]], align 4
; CHECK-NEXT:    [[PIA1B:%.*]] = getelementptr i8, ptr [[PI]], i64 28
; CHECK-NEXT:    store i32 5, ptr [[PIA1B]], align 4
; CHECK-NEXT:    [[PIA1C:%.*]] = getelementptr i8, ptr [[PI]], i64 32
; CHECK-NEXT:    store i32 6, ptr [[PIA1C]], align 4
; CHECK-NEXT:    ret void
;
; Fold snprintf(0, 0, "%s", a[0].a) to 1.
  %ia0a = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr @a)
  store i32 %ia0a, ptr %pi

; Fold snprintf(0, 0, "%s", a[0].a) to 0.
  %pa0ap1 = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 0, i32 0, i64 1
  %ia0ap1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa0ap1)
  %pia0ap1 = getelementptr i32, ptr %pi, i32 1
  store i32 %ia0ap1, ptr %pia0ap1

; Fold snprintf(0, 0, "%s", a[0].b) to 2.
  %pa0b = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 0
  %ia0b = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa0b)
  %pia0b = getelementptr i32, ptr %pi, i32 2
  store i32 %ia0b, ptr %pia0b

; Fold snprintf(0, 0, "%s", a[0].b + 1) to 1.
  %pa0bp1 = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 1
  %ia0bp1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa0bp1)
  %pia0bp1 = getelementptr i32, ptr %pi, i32 3
  store i32 %ia0bp1, ptr %pia0bp1

; Fold snprintf(0, 0, "%s", a[0].b + 2) to 0.
  %pa0bp2 = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 0, i32 1, i64 2
  %ia0bp2 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa0bp2)
  %pia0bp2 = getelementptr i32, ptr %pi, i32 4
  store i32 %ia0bp2, ptr %pia0bp2

; Fold snprintf(0, 0, "%s", a[0].c) to 3.
  %pa0c = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 0, i32 2, i64 0
  %ia0c = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa0c)
  %pia0c = getelementptr i32, ptr %pi, i32 5
  store i32 %ia0c, ptr %pia0c

; Fold snprintf(0, 0, "%s", a[1].a) to 4.
  %pa1a = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 1, i32 0, i64 0
  %ia1a = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa1a)
  %pia1a = getelementptr i32, ptr %pi, i32 6
  store i32 %ia1a, ptr %pia1a

; Fold snprintf(0, 0, "%s", a[1].b) to 5.
  %pa1b = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 1, i32 1, i64 0
  %ia1b = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa1b)
  %pia1b = getelementptr i32, ptr %pi, i32 7
  store i32 %ia1b, ptr %pia1b

; Fold snprintf(0, 0, "%s", a[1].c) to 6.
  %pa1c = getelementptr [2 x %struct.A], ptr @a, i64 0, i64 1, i32 2, i64 0
  %ia1c = call i32 (ptr, i64, ptr, ...) @snprintf(ptr null, i64 0, ptr @pcnt_s, ptr %pa1c)
  %pia1c = getelementptr i32, ptr %pi, i32 8
  store i32 %ia1c, ptr %pia1c

  ret void
}