File: narrow-switch.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Vary legal integer types in data layout.
; RUN: opt < %s -instcombine -S -data-layout=n32    | FileCheck %s --check-prefix=ALL --check-prefix=CHECK32
; RUN: opt < %s -instcombine -S -data-layout=n32:64 | FileCheck %s --check-prefix=ALL --check-prefix=CHECK64

; In all cases, the data-layout is irrelevant. We should shrink as much as possible in InstCombine
; and allow the backend to expand as much as needed to ensure optimal codegen for any target.

define i32 @positive1(i64 %a) {
; ALL-LABEL: @positive1(
; ALL:         switch i32
; ALL-NEXT:    i32 10, label %return
; ALL-NEXT:    i32 100, label %sw.bb1
; ALL-NEXT:    i32 1001, label %sw.bb2
; ALL-NEXT:    ]
;
entry:
  %and = and i64 %a, 4294967295
  switch i64 %and, label %sw.default [
  i64 10, label %return
  i64 100, label %sw.bb1
  i64 1001, label %sw.bb2
  ]

sw.bb1:
  br label %return

sw.bb2:
  br label %return

sw.default:
  br label %return

return:
  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
  ret i32 %retval.0
}

define i32 @negative1(i64 %a) {
; ALL-LABEL: @negative1(
; ALL:         switch i32
; ALL-NEXT:    i32 -10, label %return
; ALL-NEXT:    i32 -100, label %sw.bb1
; ALL-NEXT:    i32 -1001, label %sw.bb2
; ALL-NEXT:    ]
;
entry:
  %or = or i64 %a, -4294967296
  switch i64 %or, label %sw.default [
  i64 -10, label %return
  i64 -100, label %sw.bb1
  i64 -1001, label %sw.bb2
  ]

sw.bb1:
  br label %return

sw.bb2:
  br label %return

sw.default:
  br label %return

return:
  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
  ret i32 %retval.0
}

; Make sure truncating a constant int larger than 64-bit doesn't trigger an
; assertion.

define i32 @trunc72to68(i72 %a) {
; ALL-LABEL: @trunc72to68(
; ALL:         switch i68
; ALL-NEXT:    i68 10, label %return
; ALL-NEXT:    i68 100, label %sw.bb1
; ALL-NEXT:    i68 1001, label %sw.bb2
; ALL-NEXT:    ]
;
entry:
  %and = and i72 %a, 295147905179352825855
  switch i72 %and, label %sw.default [
  i72 10, label %return
  i72 100, label %sw.bb1
  i72 1001, label %sw.bb2
  ]

sw.bb1:
  br label %return

sw.bb2:
  br label %return

sw.default:
  br label %return

return:
  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
  ret i32 %retval.0
}

; Make sure to avoid assertion crashes and use the type before
; truncation to generate the sub constant expressions that leads
; to the recomputed condition.

define void @trunc64to59(i64 %a) {
; ALL-LABEL: @trunc64to59(
; ALL:         switch i59
; ALL-NEXT:    i59 0, label %sw.bb1
; ALL-NEXT:    i59 18717182647723699, label %sw.bb2
; ALL-NEXT:    ]
;
entry:
  %tmp0 = and i64 %a, 15
  %tmp1 = mul i64 %tmp0, -6425668444178048401
  %tmp2 = add i64 %tmp1, 5170979678563097242
  %tmp3 = mul i64 %tmp2, 1627972535142754813
  switch i64 %tmp3, label %sw.default [
  i64 847514119312061490, label %sw.bb1
  i64 866231301959785189, label %sw.bb2
  ]

sw.bb1:
  br label %sw.default

sw.bb2:
  br label %sw.default

sw.default:
  ret void
}

; https://llvm.org/bugs/show_bug.cgi?id=31260

define i8 @PR31260(i8 %x) {
; ALL-LABEL: @PR31260(
; ALL-NEXT:  entry:
; ALL-NEXT:    [[TMP0:%.*]] = trunc i8 %x to i2
; ALL-NEXT:    [[TRUNC:%.*]] = and i2 [[TMP0]], -2
; ALL-NEXT:    switch i2 [[TRUNC]], label %exit [
; ALL-NEXT:    i2 0, label %case126
; ALL-NEXT:    i2 -2, label %case124
; ALL-NEXT:    ]
; ALL:       exit:
; ALL-NEXT:    ret i8 1
; ALL:       case126:
; ALL-NEXT:    ret i8 3
; ALL:       case124:
; ALL-NEXT:    ret i8 5
;
entry:
  %t4 = and i8 %x, 2
  %t5 = add nsw i8 %t4, -126
  switch i8 %t5, label %exit [
  i8 -126, label %case126
  i8 -124, label %case124
  ]

exit:
  ret i8 1
case126:
  ret i8 3
case124:
  ret i8 5
}

; Make sure the arithmetic evaluation of the switch
; condition is evaluated on the original type
define i32 @trunc32to16(i32 %a0) #0 {
; ALL-LABEL: @trunc32to16(
; ALL:         switch i16
; ALL-NEXT:    i16 63, label %sw.bb
; ALL-NEXT:    i16 1, label %sw.bb1
; ALL-NEXT:    i16 100, label %sw.bb2
; ALL-NEXT:    ]
;
entry:
  %retval = alloca i32, align 4
  %xor = xor i32 %a0, 1034460917
  %shr = lshr i32 %xor, 16
  %add = add i32 %shr, -917677090
  switch i32 %add, label %sw.epilog [
    i32 -917677027, label %sw.bb
    i32 -917677089, label %sw.bb1
    i32 -917676990, label %sw.bb2
  ]

sw.bb:                                            ; preds = %entry
  store i32 90, i32* %retval, align 4
  br label %return

sw.bb1:                                           ; preds = %entry
  store i32 91, i32* %retval, align 4
  br label %return

sw.bb2:                                           ; preds = %entry
  store i32 92, i32* %retval, align 4
  br label %return

sw.epilog:                                        ; preds = %entry
  store i32 113, i32* %retval, align 4
  br label %return

return:                                           ; preds = %sw.epilog, %sw.bb2,
  %rval = load i32, i32* %retval, align 4
  ret i32 %rval
}