llvm/test/Transforms/InstCombine/icmp-trunc.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s

declare void @use(i8)

define i1 @ult_2(i32 %x) {
; CHECK-LABEL: @ult_2(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 254
; CHECK-NEXT:    [[R:%.*]] = icmp eq i32 [[TMP1]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ult i8 %t, 2
  ret i1 %r
}

define <2 x i1> @ult_16_splat(<2 x i16> %x) {
; CHECK-LABEL: @ult_16_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 2032, i16 2032>
; CHECK-NEXT:    [[R:%.*]] = icmp eq <2 x i16> [[TMP1]], zeroinitializer
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp ult <2 x i11> %t, <i11 16, i11 16>
  ret <2 x i1> %r
}

; negative test - need power-of-2 constant

define i1 @ult_3(i32 %x) {
; CHECK-LABEL: @ult_3(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], 3
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ult i8 %t, 3
  ret i1 %r
}

; negative test - no extra use allowed

define i1 @ult_2_use(i32 %x) {
; CHECK-LABEL: @ult_2_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], 2
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp ult i8 %t, 2
  ret i1 %r
}

@a = internal unnamed_addr constant [3 x i32] [i32 0, i32 0, i32 1], align 4

define i1 @PR52260(i32 %x) {
; CHECK-LABEL: @PR52260(
; CHECK-NEXT:    ret i1 true
;
  %idxprom = sext i32 %x to i64
  %idx = getelementptr inbounds [3 x i32], [3 x i32]* @a, i64 0, i64 %idxprom
  %t1 = load i32, i32* %idx, align 4
  %conv1 = lshr i32 %t1, 1
  %t2 = trunc i32 %conv1 to i8
  %conv2 = and i8 %t2, 127
  %tobool = icmp eq i8 %conv2, 0
  ret i1 %tobool
}

define i1 @ult_192(i32 %x) {
; CHECK-LABEL: @ult_192(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 192
; CHECK-NEXT:    [[R:%.*]] = icmp ne i32 [[TMP1]], 192
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ult i8 %t, 192 ; 0b1100_0000
  ret i1 %r
}

define <2 x i1> @ult_2044_splat(<2 x i16> %x) {
; CHECK-LABEL: @ult_2044_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 2044, i16 2044>
; CHECK-NEXT:    [[R:%.*]] = icmp ne <2 x i16> [[TMP1]], <i16 2044, i16 2044>
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp ult <2 x i11> %t, <i11 2044, i11 2044> ; 0b111_1111_1100
  ret <2 x i1> %r
}

; negative test - need high-bit-mask constant

define i1 @ult_96(i32 %x) {
; CHECK-LABEL: @ult_96(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], 96
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ult i8 %t, 96  ; 0b0110_0000
  ret i1 %r
}

; negative test - no extra use allowed

define i1 @ult_192_use(i32 %x) {
; CHECK-LABEL: @ult_192_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], -64
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp ult i8 %t, 192
  ret i1 %r
}

define i1 @ugt_3(i32 %x) {
; CHECK-LABEL: @ugt_3(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 252
; CHECK-NEXT:    [[R:%.*]] = icmp ne i32 [[TMP1]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ugt i8 %t, 3
  ret i1 %r
}

define <2 x i1> @ugt_7_splat(<2 x i16> %x) {
; CHECK-LABEL: @ugt_7_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 2040, i16 2040>
; CHECK-NEXT:    [[R:%.*]] = icmp ne <2 x i16> [[TMP1]], zeroinitializer
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp ugt <2 x i11> %t, <i11 7, i11 7>
  ret <2 x i1> %r
}

; negative test - need low-bit-mask constant

define i1 @ugt_4(i32 %x) {
; CHECK-LABEL: @ugt_4(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], 4
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ugt i8 %t, 4
  ret i1 %r
}

; negative test - no extra use allowed

define i1 @ugt_3_use(i32 %x) {
; CHECK-LABEL: @ugt_3_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], 3
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp ugt i8 %t, 3
  ret i1 %r
}

define i1 @ugt_253(i32 %x) {
; CHECK-LABEL: @ugt_253(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 254
; CHECK-NEXT:    [[R:%.*]] = icmp eq i32 [[TMP1]], 254
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ugt i8 %t, 253
  ret i1 %r
}

define <2 x i1> @ugt_2043_splat(<2 x i16> %x) {
; CHECK-LABEL: @ugt_2043_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 2044, i16 2044>
; CHECK-NEXT:    [[R:%.*]] = icmp eq <2 x i16> [[TMP1]], <i16 2044, i16 2044>
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp ugt <2 x i11> %t, <i11 2043, i11 2043> ; 0b111_1111_101
  ret <2 x i1> %r
}

; negative test - need not-of-power-of-2 constant

define i1 @ugt_252(i32 %x) {
; CHECK-LABEL: @ugt_252(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], -4
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp ugt i8 %t, 252
  ret i1 %r
}

; negative test - no extra use allowed

define i1 @ugt_253_use(i32 %x) {
; CHECK-LABEL: @ugt_253_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], -3
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp ugt i8 %t, 253
  ret i1 %r
}

define i1 @slt_0(i32 %x) {
; CHECK-LABEL: @slt_0(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 128
; CHECK-NEXT:    [[R:%.*]] = icmp ne i32 [[TMP1]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp slt i8 %t, 0
  ret i1 %r
}

define <2 x i1> @slt_0_splat(<2 x i16> %x) {
; CHECK-LABEL: @slt_0_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 1024, i16 1024>
; CHECK-NEXT:    [[R:%.*]] = icmp ne <2 x i16> [[TMP1]], zeroinitializer
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp slt <2 x i11> %t, zeroinitializer
  ret <2 x i1> %r
}

define i1 @slt_1(i32 %x) {
; CHECK-LABEL: @slt_1(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[T]], 1
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp slt i8 %t, 1
  ret i1 %r
}

define i1 @slt_0_use(i32 %x) {
; CHECK-LABEL: @slt_0_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[T]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp slt i8 %t, 0
  ret i1 %r
}

define i1 @sgt_n1(i32 %x) {
; CHECK-LABEL: @sgt_n1(
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 128
; CHECK-NEXT:    [[R:%.*]] = icmp eq i32 [[TMP1]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp sgt i8 %t, -1
  ret i1 %r
}

define <2 x i1> @sgt_n1_splat(<2 x i16> %x) {
; CHECK-LABEL: @sgt_n1_splat(
; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i16> [[X:%.*]], <i16 1024, i16 1024>
; CHECK-NEXT:    [[R:%.*]] = icmp eq <2 x i16> [[TMP1]], zeroinitializer
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t = trunc <2 x i16> %x to <2 x i11>
  %r = icmp sgt <2 x i11> %t, <i11 -1, i11 -1>
  ret <2 x i1> %r
}

define i1 @sgt_0(i32 %x) {
; CHECK-LABEL: @sgt_0(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[T]], 0
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  %r = icmp sgt i8 %t, 0
  ret i1 %r
}

define i1 @sgt_n1_use(i32 %x) {
; CHECK-LABEL: @sgt_n1_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[T]], -1
; CHECK-NEXT:    ret i1 [[R]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %r = icmp sgt i8 %t, -1
  ret i1 %r
}