test/Transforms/InstCombine/sext.ll

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

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"

declare i32 @llvm.ctpop.i32(i32)
declare i32 @llvm.ctlz.i32(i32, i1)
declare i32 @llvm.cttz.i32(i32, i1)
declare void @use(i8)
declare void @use_vec(<2 x i5>)

define i64 @test1(i32 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    [[T:%.*]] = call i32 @llvm.ctpop.i32(i32 [[X:%.*]]), !range [[RNG0:![0-9]+]]
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = call i32 @llvm.ctpop.i32(i32 %x)
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test2(i32 %x) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    [[T:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X:%.*]], i1 true), !range [[RNG0]]
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = call i32 @llvm.ctlz.i32(i32 %x, i1 true)
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test3(i32 %x) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    [[T:%.*]] = call i32 @llvm.cttz.i32(i32 [[X:%.*]], i1 true), !range [[RNG0]]
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = call i32 @llvm.cttz.i32(i32 %x, i1 true)
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test4(i32 %x) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:    [[T:%.*]] = udiv i32 [[X:%.*]], 3
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = udiv i32 %x, 3
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test5(i32 %x) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    [[T:%.*]] = urem i32 [[X:%.*]], 30000
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = urem i32 %x, 30000
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test6(i32 %x) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:    [[U:%.*]] = lshr i32 [[X:%.*]], 3
; CHECK-NEXT:    [[T:%.*]] = mul nuw nsw i32 [[U]], 3
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %u = lshr i32 %x, 3
  %t = mul i32 %u, 3
  %s = sext i32 %t to i64
  ret i64 %s
}

define i64 @test7(i32 %x) {
; CHECK-LABEL: @test7(
; CHECK-NEXT:    [[T:%.*]] = and i32 [[X:%.*]], 511
; CHECK-NEXT:    [[U:%.*]] = sub nuw nsw i32 20000, [[T]]
; CHECK-NEXT:    [[S:%.*]] = zext i32 [[U]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = and i32 %x, 511
  %u = sub i32 20000, %t
  %s = sext i32 %u to i64
  ret i64 %s
}

define i32 @test8(i8 %a, i32 %f, i1 %p, ptr %z) {
; CHECK-LABEL: @test8(
; CHECK-NEXT:    [[D:%.*]] = lshr i32 [[F:%.*]], 24
; CHECK-NEXT:    [[N:%.*]] = select i1 [[P:%.*]], i32 [[D]], i32 0
; CHECK-NEXT:    ret i32 [[N]]
;
  %d = lshr i32 %f, 24
  %e = select i1 %p, i32 %d, i32 0
  %s = trunc i32 %e to i16
  %n = sext i16 %s to i32
  ret i32 %n
}

; rdar://6013816
define i16 @test9(i16 %t, i1 %cond) {
; CHECK-LABEL: @test9(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[TBB:%.*]], label [[FBB:%.*]]
; CHECK:       TBB:
; CHECK-NEXT:    br label [[FBB]]
; CHECK:       FBB:
; CHECK-NEXT:    [[V_OFF0:%.*]] = phi i16 [ [[T:%.*]], [[TBB]] ], [ 42, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i16 [[V_OFF0]]
;
entry:
  br i1 %cond, label %TBB, label %FBB

TBB:
  %t2 = sext i16 %t to i32
  br label %FBB

FBB:
  %V = phi i32 [%t2, %TBB], [42, %entry]
  %W = trunc i32 %V to i16
  ret i16 %W
}

; PR2638
define i32 @test10(i32 %i) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:    [[D1:%.*]] = shl i32 [[I:%.*]], 30
; CHECK-NEXT:    [[D:%.*]] = ashr exact i32 [[D1]], 30
; CHECK-NEXT:    ret i32 [[D]]
;
  %A = trunc i32 %i to i8
  %B = shl i8 %A, 6
  %C = ashr i8 %B, 6
  %D = sext i8 %C to i32
  ret i32 %D
}

define <2 x i32> @test10_vec(<2 x i32> %i) {
; CHECK-LABEL: @test10_vec(
; CHECK-NEXT:    [[D1:%.*]] = shl <2 x i32> [[I:%.*]], <i32 30, i32 30>
; CHECK-NEXT:    [[D:%.*]] = ashr exact <2 x i32> [[D1]], <i32 30, i32 30>
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %A = trunc <2 x i32> %i to <2 x i8>
  %B = shl <2 x i8> %A, <i8 6, i8 6>
  %C = ashr <2 x i8> %B, <i8 6, i8 6>
  %D = sext <2 x i8> %C to <2 x i32>
  ret <2 x i32> %D
}

define <2 x i32> @test10_vec_nonuniform(<2 x i32> %i) {
; CHECK-LABEL: @test10_vec_nonuniform(
; CHECK-NEXT:    [[D1:%.*]] = shl <2 x i32> [[I:%.*]], <i32 30, i32 27>
; CHECK-NEXT:    [[D:%.*]] = ashr <2 x i32> [[D1]], <i32 30, i32 27>
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %A = trunc <2 x i32> %i to <2 x i8>
  %B = shl <2 x i8> %A, <i8 6, i8 3>
  %C = ashr <2 x i8> %B, <i8 6, i8 3>
  %D = sext <2 x i8> %C to <2 x i32>
  ret <2 x i32> %D
}

define <2 x i32> @test10_vec_undef0(<2 x i32> %i) {
; CHECK-LABEL: @test10_vec_undef0(
; CHECK-NEXT:    [[D1:%.*]] = shl <2 x i32> [[I:%.*]], <i32 30, i32 undef>
; CHECK-NEXT:    [[D:%.*]] = ashr <2 x i32> [[D1]], <i32 30, i32 undef>
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %A = trunc <2 x i32> %i to <2 x i8>
  %B = shl <2 x i8> %A, <i8 6, i8 0>
  %C = ashr <2 x i8> %B, <i8 6, i8 undef>
  %D = sext <2 x i8> %C to <2 x i32>
  ret <2 x i32> %D
}
define <2 x i32> @test10_vec_undef1(<2 x i32> %i) {
; CHECK-LABEL: @test10_vec_undef1(
; CHECK-NEXT:    [[D1:%.*]] = shl <2 x i32> [[I:%.*]], <i32 30, i32 undef>
; CHECK-NEXT:    [[D:%.*]] = ashr <2 x i32> [[D1]], <i32 30, i32 undef>
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %A = trunc <2 x i32> %i to <2 x i8>
  %B = shl <2 x i8> %A, <i8 6, i8 undef>
  %C = ashr <2 x i8> %B, <i8 6, i8 0>
  %D = sext <2 x i8> %C to <2 x i32>
  ret <2 x i32> %D
}
define <2 x i32> @test10_vec_undef2(<2 x i32> %i) {
; CHECK-LABEL: @test10_vec_undef2(
; CHECK-NEXT:    [[D1:%.*]] = shl <2 x i32> [[I:%.*]], <i32 30, i32 undef>
; CHECK-NEXT:    [[D:%.*]] = ashr <2 x i32> [[D1]], <i32 30, i32 undef>
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %A = trunc <2 x i32> %i to <2 x i8>
  %B = shl <2 x i8> %A, <i8 6, i8 undef>
  %C = ashr <2 x i8> %B, <i8 6, i8 undef>
  %D = sext <2 x i8> %C to <2 x i32>
  ret <2 x i32> %D
}

define void @test11(<2 x i16> %srcA, <2 x i16> %srcB, ptr %dst) {
; CHECK-LABEL: @test11(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq <2 x i16> [[SRCB:%.*]], [[SRCA:%.*]]
; CHECK-NEXT:    [[SEXT:%.*]] = sext <2 x i1> [[CMP]] to <2 x i16>
; CHECK-NEXT:    store <2 x i16> [[SEXT]], ptr [[DST:%.*]], align 4
; CHECK-NEXT:    ret void
;
  %cmp = icmp eq <2 x i16> %srcB, %srcA
  %sext = sext <2 x i1> %cmp to <2 x i16>
  %tmask = ashr <2 x i16> %sext, <i16 15, i16 15>
  store <2 x i16> %tmask, ptr %dst
  ret void
}

define i64 @test12(i32 %x) {
; CHECK-LABEL: @test12(
; CHECK-NEXT:    [[SHR:%.*]] = lshr i32 [[X:%.*]], 1
; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 0, [[SHR]]
; CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[SUB]] to i64
; CHECK-NEXT:    ret i64 [[CONV]]
;
  %shr = lshr i32 %x, 1
  %sub = sub nsw i32 0, %shr
  %conv = sext i32 %sub to i64
  ret i64 %conv
}

define i32 @test13(i32 %x) {
; CHECK-LABEL: @test13(
; CHECK-NEXT:    [[AND:%.*]] = lshr i32 [[X:%.*]], 3
; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[AND]], 1
; CHECK-NEXT:    [[SEXT:%.*]] = add nsw i32 [[TMP1]], -1
; CHECK-NEXT:    ret i32 [[SEXT]]
;
  %and = and i32 %x, 8
  %cmp = icmp eq i32 %and, 0
  %ext = sext i1 %cmp to i32
  ret i32 %ext
}

define i32 @test14(i16 %x) {
; CHECK-LABEL: @test14(
; CHECK-NEXT:    [[AND:%.*]] = lshr i16 [[X:%.*]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = and i16 [[AND]], 1
; CHECK-NEXT:    [[SEXT:%.*]] = add nsw i16 [[TMP1]], -1
; CHECK-NEXT:    [[EXT:%.*]] = sext i16 [[SEXT]] to i32
; CHECK-NEXT:    ret i32 [[EXT]]
;
  %and = and i16 %x, 16
  %cmp = icmp ne i16 %and, 16
  %ext = sext i1 %cmp to i32
  ret i32 %ext
}

define i32 @test15(i32 %x) {
; CHECK-LABEL: @test15(
; CHECK-NEXT:    [[AND:%.*]] = shl i32 [[X:%.*]], 27
; CHECK-NEXT:    [[SEXT:%.*]] = ashr i32 [[AND]], 31
; CHECK-NEXT:    ret i32 [[SEXT]]
;
  %and = and i32 %x, 16
  %cmp = icmp ne i32 %and, 0
  %ext = sext i1 %cmp to i32
  ret i32 %ext
}

define i32 @test16(i16 %x) {
; CHECK-LABEL: @test16(
; CHECK-NEXT:    [[AND:%.*]] = shl i16 [[X:%.*]], 12
; CHECK-NEXT:    [[SEXT:%.*]] = ashr i16 [[AND]], 15
; CHECK-NEXT:    [[EXT:%.*]] = sext i16 [[SEXT]] to i32
; CHECK-NEXT:    ret i32 [[EXT]]
;
  %and = and i16 %x, 8
  %cmp = icmp eq i16 %and, 8
  %ext = sext i1 %cmp to i32
  ret i32 %ext
}

define i32 @test17(i1 %x) {
; CHECK-LABEL: @test17(
; CHECK-NEXT:    [[C1_NEG:%.*]] = zext i1 [[X:%.*]] to i32
; CHECK-NEXT:    ret i32 [[C1_NEG]]
;
  %c1 = sext i1 %x to i32
  %c2 = sub i32 0, %c1
  ret i32 %c2
}

define i32 @test18(i16 %x) {
; CHECK-LABEL: @test18(
; CHECK-NEXT:    [[SEL:%.*]] = call i16 @llvm.smax.i16(i16 [[X:%.*]], i16 0)
; CHECK-NEXT:    [[EXT:%.*]] = zext i16 [[SEL]] to i32
; CHECK-NEXT:    ret i32 [[EXT]]
;
  %cmp = icmp slt i16 %x, 0
  %sel = select i1 %cmp, i16 0, i16 %x
  %ext = sext i16 %sel to i32
  ret i32 %ext
}

define i10 @test19(i10 %i) {
; CHECK-LABEL: @test19(
; CHECK-NEXT:    [[A:%.*]] = trunc i10 [[I:%.*]] to i3
; CHECK-NEXT:    [[TMP1:%.*]] = and i3 [[A]], 1
; CHECK-NEXT:    [[C:%.*]] = sub nsw i3 0, [[TMP1]]
; CHECK-NEXT:    [[D:%.*]] = sext i3 [[C]] to i10
; CHECK-NEXT:    ret i10 [[D]]
;
  %a = trunc i10 %i to i3
  %b = shl i3 %a, 2
  %c = ashr i3 %b, 2
  %d = sext i3 %c to i10
  ret i10 %d
}

define i32 @smear_set_bit(i32 %x) {
; CHECK-LABEL: @smear_set_bit(
; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 [[X:%.*]], 24
; CHECK-NEXT:    [[S:%.*]] = ashr i32 [[TMP1]], 31
; CHECK-NEXT:    ret i32 [[S]]
;
  %t = trunc i32 %x to i8
  %a = ashr i8 %t, 7
  %s = sext i8 %a to i32
  ret i32 %s
}

; extra use of trunc is ok because we still shorten the use chain

define <2 x i32> @smear_set_bit_vec_use1(<2 x i32> %x) {
; CHECK-LABEL: @smear_set_bit_vec_use1(
; CHECK-NEXT:    [[T:%.*]] = trunc <2 x i32> [[X:%.*]] to <2 x i5>
; CHECK-NEXT:    call void @use_vec(<2 x i5> [[T]])
; CHECK-NEXT:    [[TMP1:%.*]] = shl <2 x i32> [[X]], <i32 27, i32 27>
; CHECK-NEXT:    [[S:%.*]] = ashr <2 x i32> [[TMP1]], <i32 31, i32 31>
; CHECK-NEXT:    ret <2 x i32> [[S]]
;
  %t = trunc <2 x i32> %x to <2 x i5>
  call void @use_vec(<2 x i5> %t)
  %a = ashr <2 x i5> %t, <i5 4, i5 4>
  %s = sext <2 x i5> %a to <2 x i32>
  ret <2 x i32> %s
}

; negative test - extra use

define i32 @smear_set_bit_use2(i32 %x) {
; CHECK-LABEL: @smear_set_bit_use2(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[T]], 7
; CHECK-NEXT:    call void @use(i8 [[A]])
; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i32
; CHECK-NEXT:    ret i32 [[S]]
;
  %t = trunc i32 %x to i8
  %a = ashr i8 %t, 7
  call void @use(i8 %a)
  %s = sext i8 %a to i32
  ret i32 %s
}

; negative test - must shift all the way across

define i32 @smear_set_bit_wrong_shift_amount(i32 %x) {
; CHECK-LABEL: @smear_set_bit_wrong_shift_amount(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[T]], 6
; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i32
; CHECK-NEXT:    ret i32 [[S]]
;
  %t = trunc i32 %x to i8
  %a = ashr i8 %t, 6
  %s = sext i8 %a to i32
  ret i32 %s
}

define i16 @smear_set_bit_different_dest_type(i32 %x) {
; CHECK-LABEL: @smear_set_bit_different_dest_type(
; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 [[X:%.*]], 24
; CHECK-NEXT:    [[TMP2:%.*]] = ashr i32 [[TMP1]], 31
; CHECK-NEXT:    [[S:%.*]] = trunc i32 [[TMP2]] to i16
; CHECK-NEXT:    ret i16 [[S]]
;
  %t = trunc i32 %x to i8
  %a = ashr i8 %t, 7
  %s = sext i8 %a to i16
  ret i16 %s
}

; negative test - extra use

define i16 @smear_set_bit_different_dest_type_extra_use(i32 %x) {
; CHECK-LABEL: @smear_set_bit_different_dest_type_extra_use(
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[X:%.*]] to i8
; CHECK-NEXT:    call void @use(i8 [[T]])
; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[T]], 7
; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i16
; CHECK-NEXT:    ret i16 [[S]]
;
  %t = trunc i32 %x to i8
  call void @use(i8 %t)
  %a = ashr i8 %t, 7
  %s = sext i8 %a to i16
  ret i16 %s
}

define i64 @smear_set_bit_different_dest_type_wider_dst(i32 %x) {
; CHECK-LABEL: @smear_set_bit_different_dest_type_wider_dst(
; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 [[X:%.*]], 24
; CHECK-NEXT:    [[TMP2:%.*]] = ashr i32 [[TMP1]], 31
; CHECK-NEXT:    [[S:%.*]] = sext i32 [[TMP2]] to i64
; CHECK-NEXT:    ret i64 [[S]]
;
  %t = trunc i32 %x to i8
  %a = ashr i8 %t, 7
  %s = sext i8 %a to i64
  ret i64 %s
}