llvm/test/CodeGen/ARM/arm-cgp-overflow.ll

; RUN: llc -mtriple=thumbv8m.main -mcpu=cortex-m33 %s -arm-disable-cgp=false -o - | FileCheck %s

; CHECK: overflow_add
; CHECK: add
; CHECK: uxth
; CHECK: cmp
define zeroext i16 @overflow_add(i16 zeroext %a, i16 zeroext %b) {
  %add = add i16 %a, %b
  %or = or i16 %add, 1
  %cmp = icmp ugt i16 %or, 1024
  %res = select i1 %cmp, i16 2, i16 5
  ret i16 %res
}

; CHECK-LABEL: overflow_sub
; CHECK: sub
; CHECK: uxth
; CHECK: cmp
define zeroext i16 @overflow_sub(i16 zeroext %a, i16 zeroext %b) {
  %add = sub i16 %a, %b
  %or = or i16 %add, 1
  %cmp = icmp ugt i16 %or, 1024
  %res = select i1 %cmp, i16 2, i16 5
  ret i16 %res
}

; CHECK-LABEL: overflow_mul
; CHECK: mul
; CHECK: uxth
; CHECK: cmp
define zeroext i16 @overflow_mul(i16 zeroext %a, i16 zeroext %b) {
  %add = mul i16 %a, %b
  %or = or i16 %add, 1
  %cmp = icmp ugt i16 %or, 1024
  %res = select i1 %cmp, i16 2, i16 5
  ret i16 %res
}

; CHECK-LABEL: overflow_shl
; CHECK-COMMON: lsl
; CHECK-COMMON: uxth
; CHECK-COMMON: cmp
define zeroext i16 @overflow_shl(i16 zeroext %a, i16 zeroext %b) {
  %add = shl i16 %a, %b
  %or = or i16 %add, 1
  %cmp = icmp ugt i16 %or, 1024
  %res = select i1 %cmp, i16 2, i16 5
  ret i16 %res
}

; CHECK-LABEL: overflow_add_no_consts:
; CHECK:  add r0, r1
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], r2
; CHECK:  movhi r0, #8
define i32 @overflow_add_no_consts(i8 zeroext %a, i8 zeroext %b, i8 zeroext %limit) {
  %add = add i8 %a, %b
  %cmp = icmp ugt i8 %add, %limit
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: overflow_add_const_limit:
; CHECK:  add r0, r1
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #128
; CHECK:  movhi r0, #8
define i32 @overflow_add_const_limit(i8 zeroext %a, i8 zeroext %b) {
  %add = add i8 %a, %b
  %cmp = icmp ugt i8 %add, 128
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: overflow_add_positive_const_limit:
; CHECK:  adds r0, #1
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #128
; CHECK:  movhi r0, #8
define i32 @overflow_add_positive_const_limit(i8 zeroext %a) {
  %add = add i8 %a, 1
  %cmp = icmp ugt i8 %add, 128
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: unsafe_add_underflow:
; CHECK:  subs r0, #2
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #255
; CHECK:  moveq r0, #8
define i32 @unsafe_add_underflow(i8 zeroext %a) {
  %add = add i8 %a, -2
  %cmp = icmp ugt i8 %add, 254
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: safe_add_underflow:
; CHECK:      subs [[MINUS_1:r[0-9]+]], r0, #1
; CHECK-NOT:  uxtb
; CHECK:      cmp [[MINUS_1]], #254
; CHECK:      movhi r0, #8
define i32 @safe_add_underflow(i8 zeroext %a) {
  %add = add i8 %a, -1
  %cmp = icmp ugt i8 %add, 254
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: safe_add_underflow_neg:
; CHECK:      subs [[MINUS_1:r[0-9]+]], r0, #2
; CHECK-NOT:  uxtb
; CHECK:      cmp [[MINUS_1]], #251
; CHECK:      movlo r0, #8
define i32 @safe_add_underflow_neg(i8 zeroext %a) {
  %add = add i8 %a, -2
  %cmp = icmp ule i8 %add, -6
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: overflow_sub_negative_const_limit:
; CHECK:  adds r0, #1
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #128
; CHECK:  movhi r0, #8
define i32 @overflow_sub_negative_const_limit(i8 zeroext %a) {
  %sub = sub i8 %a, -1
  %cmp = icmp ugt i8 %sub, 128
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: unsafe_sub_underflow:
; CHECK:  subs r0, #6
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #250
; CHECK:  movhi r0, #8
define i32 @unsafe_sub_underflow(i8 zeroext %a) {
  %sub = sub i8 %a, 6
  %cmp = icmp ugt i8 %sub, 250
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: safe_sub_underflow:
; CHECK:      subs [[MINUS_1:r[0-9]+]], r0, #1
; CHECK-NOT:  uxtb
; CHECK:      cmp [[MINUS_1]], #255
; CHECK:      movlo r0, #8
define i32 @safe_sub_underflow(i8 zeroext %a) {
  %sub = sub i8 %a, 1
  %cmp = icmp ule i8 %sub, 254
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK-LABEL: safe_sub_underflow_neg
; CHECK:      subs [[MINUS_1:r[0-9]+]], r0, #4
; CHECK-NOT:  uxtb
; CHECK:      cmp [[MINUS_1]], #250
; CHECK:      movhi r0, #8
define i32 @safe_sub_underflow_neg(i8 zeroext %a) {
  %sub = sub i8 %a, 4
  %cmp = icmp uge i8 %sub, -5
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}

; CHECK:  subs r0, #4
; CHECK:  uxtb [[EXT:r[0-9]+]], r0
; CHECK:  cmp [[EXT]], #253
; CHECK:  movlo r0, #8
define i32 @unsafe_sub_underflow_neg(i8 zeroext %a) {
  %sub = sub i8 %a, 4
  %cmp = icmp ult i8 %sub, -3
  %res = select i1 %cmp, i32 8, i32 16
  ret i32 %res
}