llvm/test/Analysis/ValueTracking/knownbits-abs.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instsimplify -S < %s | FileCheck %s
declare i8 @llvm.abs.i8(i8, i1)

define i1 @abs_low_bit_set(i8 %x) {
; CHECK-LABEL: @abs_low_bit_set(
; CHECK-NEXT:    ret i1 false
;
  %xx = and i8 %x, 240
  %v = or i8 %xx, 4
  %abs = call i8 @llvm.abs.i8(i8 %v, i1 true)
  %and = and i8 %abs, 4
  %r = icmp eq i8 %and, 0
  ret i1 %r
}

define i1 @abs_unknown_low_bit_set_fail(i8 %x) {
; CHECK-LABEL: @abs_unknown_low_bit_set_fail(
; CHECK-NEXT:    [[V:%.*]] = or i8 [[X:%.*]], 2
; CHECK-NEXT:    [[ABS:%.*]] = call i8 @llvm.abs.i8(i8 [[V]], i1 true)
; CHECK-NEXT:    [[AND:%.*]] = and i8 [[ABS]], 2
; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %v = or i8 %x, 2
  %abs = call i8 @llvm.abs.i8(i8 %v, i1 true)
  %and = and i8 %abs, 2
  %r = icmp eq i8 %and, 0
  ret i1 %r
}

define i1 @abs_negative(i8 %x) {
; CHECK-LABEL: @abs_negative(
; CHECK-NEXT:    ret i1 false
;
  %xx = and i8 %x, 240
  %v = or i8 %xx, 132
  %abs = call i8 @llvm.abs.i8(i8 %v, i1 true)
  %and = and i8 %abs, 8
  %r = icmp eq i8 %and, 0
  ret i1 %r
}

define i1 @abs_negative2(i8 %x) {
; CHECK-LABEL: @abs_negative2(
; CHECK-NEXT:    ret i1 false
;
  %v = or i8 %x, 131
  %abs = call i8 @llvm.abs.i8(i8 %v, i1 true)
  %and = and i8 %abs, 2
  %r = icmp eq i8 %and, 2
  ret i1 %r
}

define i1 @abs_negative_no_carry_info_fail(i8 %x) {
; CHECK-LABEL: @abs_negative_no_carry_info_fail(
; CHECK-NEXT:    [[V:%.*]] = or i8 [[X:%.*]], -126
; CHECK-NEXT:    [[ABS:%.*]] = call i8 @llvm.abs.i8(i8 [[V]], i1 true)
; CHECK-NEXT:    [[AND:%.*]] = and i8 [[ABS]], 2
; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %v = or i8 %x, 130
  %abs = call i8 @llvm.abs.i8(i8 %v, i1 true)
  %and = and i8 %abs, 2
  %r = icmp eq i8 %and, 0
  ret i1 %r
}