test/Transforms/InstCombine/2004-11-27-SetCCForCastLargerAndConstant.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; This test case tests the InstructionCombining optimization that
; reduces things like:
;   %Y = sext i8 %X to i32
;   %C = icmp ult i32 %Y, 1024
; to
;   %C = i1 true
; It includes test cases for different constant values, signedness of the
; cast operands, and types of setCC operators. In all cases, the cast should
; be eliminated. In many cases the setCC is also eliminated based on the
; constant value and the range of the casted value.
;
; RUN: opt < %s -instcombine -S | FileCheck %s

define i1 @lt_signed_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_unsigned(
; CHECK-NEXT:    [[C1:%.*]] = icmp sgt i8 %SB, -1
; CHECK-NEXT:    ret i1 [[C1]]
;
  %Y = sext i8 %SB to i32
  %C = icmp ult i32 %Y, 1024
  ret i1 %C
}

; PR28011 - https://llvm.org/bugs/show_bug.cgi?id=28011
; The above transform only applies to scalar integers; it shouldn't be attempted for constant expressions or vectors.

@a = common global i32** null
@b = common global [1 x i32] zeroinitializer

define i1 @PR28011(i16 %a) {
; CHECK-LABEL: @PR28011(
; CHECK-NEXT:    [[CONV:%.*]] = sext i16 %a to i32
; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[CONV]], or (i32 zext (i1 icmp ne (i32*** bitcast ([1 x i32]* @b to i32***), i32*** @a) to i32), i32 1)
; CHECK-NEXT:    ret i1 [[CMP]]
;
  %conv = sext i16 %a to i32
  %cmp = icmp ne i32 %conv, or (i32 zext (i1 icmp ne (i32*** bitcast ([1 x i32]* @b to i32***), i32*** @a) to i32), i32 1)
  ret i1 %cmp
}

define <2 x i1> @lt_signed_to_large_unsigned_vec(<2 x i8> %SB) {
; CHECK-LABEL: @lt_signed_to_large_unsigned_vec(
; CHECK-NEXT:    [[Y:%.*]] = sext <2 x i8> %SB to <2 x i32>
; CHECK-NEXT:    [[C:%.*]] = icmp ult <2 x i32> [[Y]], <i32 1024, i32 2>
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %Y = sext <2 x i8> %SB to <2 x i32>
  %C = icmp ult <2 x i32> %Y, <i32 1024, i32 2>
  ret <2 x i1> %C
}

define i1 @lt_signed_to_large_signed(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_signed(
; CHECK-NEXT:    ret i1 true
;
  %Y = sext i8 %SB to i32
  %C = icmp slt i32 %Y, 1024
  ret i1 %C
}

define i1 @lt_signed_to_large_negative(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_negative(
; CHECK-NEXT:    ret i1 false
;
  %Y = sext i8 %SB to i32
  %C = icmp slt i32 %Y, -1024
  ret i1 %C
}

define i1 @lt_signed_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_unsigned(
; CHECK-NEXT:    [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp ult i32 %Y, 17
  ret i1 %C
}

define i1 @lt_signed_to_small_signed(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_signed(
; CHECK-NEXT:    [[C:%.*]] = icmp slt i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp slt i32 %Y, 17
  ret i1 %C
}
define i1 @lt_signed_to_small_negative(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_negative(
; CHECK-NEXT:    [[C:%.*]] = icmp slt i8 %SB, -17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp slt i32 %Y, -17
  ret i1 %C
}

define i1 @lt_unsigned_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_unsigned(
; CHECK-NEXT:    ret i1 true
;
  %Y = zext i8 %SB to i32
  %C = icmp ult i32 %Y, 1024
  ret i1 %C
}

define i1 @lt_unsigned_to_large_signed(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_signed(
; CHECK-NEXT:    ret i1 true
;
  %Y = zext i8 %SB to i32
  %C = icmp slt i32 %Y, 1024
  ret i1 %C
}

define i1 @lt_unsigned_to_large_negative(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_negative(
; CHECK-NEXT:    ret i1 false
;
  %Y = zext i8 %SB to i32
  %C = icmp slt i32 %Y, -1024
  ret i1 %C
}

define i1 @lt_unsigned_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_unsigned(
; CHECK-NEXT:    [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = zext i8 %SB to i32
  %C = icmp ult i32 %Y, 17
  ret i1 %C
}

define i1 @lt_unsigned_to_small_signed(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_signed(
; CHECK-NEXT:    [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = zext i8 %SB to i32
  %C = icmp slt i32 %Y, 17
  ret i1 %C
}

define i1 @lt_unsigned_to_small_negative(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_negative(
; CHECK-NEXT:    ret i1 false
;
  %Y = zext i8 %SB to i32
  %C = icmp slt i32 %Y, -17
  ret i1 %C
}

define i1 @gt_signed_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_unsigned(
; CHECK-NEXT:    [[C:%.*]] = icmp slt i8 %SB, 0
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp ugt i32 %Y, 1024
  ret i1 %C
}

define i1 @gt_signed_to_large_signed(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_signed(
; CHECK-NEXT:    ret i1 false
;
  %Y = sext i8 %SB to i32
  %C = icmp sgt i32 %Y, 1024
  ret i1 %C
}

define i1 @gt_signed_to_large_negative(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_negative(
; CHECK-NEXT:    ret i1 true
;
  %Y = sext i8 %SB to i32
  %C = icmp sgt i32 %Y, -1024
  ret i1 %C
}

define i1 @gt_signed_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_unsigned(
; CHECK-NEXT:    [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp ugt i32 %Y, 17
  ret i1 %C
}

define i1 @gt_signed_to_small_signed(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_signed(
; CHECK-NEXT:    [[C:%.*]] = icmp sgt i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp sgt i32 %Y, 17
  ret i1 %C
}

define i1 @gt_signed_to_small_negative(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_negative(
; CHECK-NEXT:    [[C:%.*]] = icmp sgt i8 %SB, -17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = sext i8 %SB to i32
  %C = icmp sgt i32 %Y, -17
  ret i1 %C
}

define i1 @gt_unsigned_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_unsigned(
; CHECK-NEXT:    ret i1 false
;
  %Y = zext i8 %SB to i32
  %C = icmp ugt i32 %Y, 1024
  ret i1 %C
}

define i1 @gt_unsigned_to_large_signed(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_signed(
; CHECK-NEXT:    ret i1 false
;
  %Y = zext i8 %SB to i32
  %C = icmp sgt i32 %Y, 1024
  ret i1 %C
}

define i1 @gt_unsigned_to_large_negative(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_negative(
; CHECK-NEXT:    ret i1 true
;
  %Y = zext i8 %SB to i32
  %C = icmp sgt i32 %Y, -1024
  ret i1 %C
}

define i1 @gt_unsigned_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_unsigned(
; CHECK-NEXT:    [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = zext i8 %SB to i32
  %C = icmp ugt i32 %Y, 17
  ret i1 %C
}

define i1 @gt_unsigned_to_small_signed(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_signed(
; CHECK-NEXT:    [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT:    ret i1 [[C]]
;
  %Y = zext i8 %SB to i32
  %C = icmp sgt i32 %Y, 17
  ret i1 %C
}

define i1 @gt_unsigned_to_small_negative(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_negative(
; CHECK-NEXT:    ret i1 true
;
  %Y = zext i8 %SB to i32
  %C = icmp sgt i32 %Y, -17
  ret i1 %C
}