llvm/test/Transforms/SimplifyCFG/RISCV/switch_to_lookup_table-rv64.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -switch-to-lookup=true -keep-loops=false -S -mattr=+f | FileCheck %s
; RUN: opt < %s -passes='simplifycfg<no-keep-loops;switch-to-lookup>' -S -mattr=+f | FileCheck %s
target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
target triple = "riscv64-unknown-elf"

; The table for @f
; CHECK: @switch.table.f = private unnamed_addr constant [7 x i32] [i32 55, i32 123, i32 0, i32 -1, i32 27, i32 62, i32 1], align 4

; The char table for char
; CHECK: @switch.table.char = private unnamed_addr constant [9 x i8] c"7{\00\FF\1B>\01!T", align 1

; The float table for @h
; CHECK: @switch.table.h = private unnamed_addr constant [4 x float] [float 0x40091EB860000000, float 0x3FF3BE76C0000000, float 0x4012449BA0000000, float 0x4001AE1480000000], align 4

; The table for @foostring
; CHECK: @switch.table.foostring = private unnamed_addr constant [4 x i8*] [i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str2, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str3, i64 0, i64 0)], align 8

; A simple int-to-int selection switch.
; It is dense enough to be replaced by table lookup.
; The result is directly by a ret from an otherwise empty bb,
; so we return early, directly from the lookup bb.

define i32 @f(i32 %c) {
; CHECK-LABEL: @f(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SWITCH_TABLEIDX:%.*]] = sub i32 [[C:%.*]], 42
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i32 [[SWITCH_TABLEIDX]], 7
; CHECK-NEXT:    br i1 [[TMP0]], label [[SWITCH_LOOKUP:%.*]], label [[RETURN:%.*]]
; CHECK:       switch.lookup:
; CHECK-NEXT:    [[SWITCH_GEP:%.*]] = getelementptr inbounds [7 x i32], [7 x i32]* @switch.table.f, i32 0, i32 [[SWITCH_TABLEIDX]]
; CHECK-NEXT:    [[SWITCH_LOAD:%.*]] = load i32, i32* [[SWITCH_GEP]], align 4
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    [[RETVAL_0:%.*]] = phi i32 [ [[SWITCH_LOAD]], [[SWITCH_LOOKUP]] ], [ 15, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[RETVAL_0]]
;
entry:
  switch i32 %c, label %sw.default [
  i32 42, label %return
  i32 43, label %sw.bb1
  i32 44, label %sw.bb2
  i32 45, label %sw.bb3
  i32 46, label %sw.bb4
  i32 47, label %sw.bb5
  i32 48, label %sw.bb6
  ]

sw.bb1: br label %return
sw.bb2: br label %return
sw.bb3: br label %return
sw.bb4: br label %return
sw.bb5: br label %return
sw.bb6: br label %return
sw.default: br label %return
return:
  %retval.0 = phi i32 [ 15, %sw.default ], [ 1, %sw.bb6 ], [ 62, %sw.bb5 ], [ 27, %sw.bb4 ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
  ret i32 %retval.0

}

; Same thing, but with i8's

define i8 @char(i32 %c) {
; CHECK-LABEL: @char(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SWITCH_TABLEIDX:%.*]] = sub i32 [[C:%.*]], 42
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i32 [[SWITCH_TABLEIDX]], 9
; CHECK-NEXT:    br i1 [[TMP0]], label [[SWITCH_LOOKUP:%.*]], label [[RETURN:%.*]]
; CHECK:       switch.lookup:
; CHECK-NEXT:    [[SWITCH_GEP:%.*]] = getelementptr inbounds [9 x i8], [9 x i8]* @switch.table.char, i32 0, i32 [[SWITCH_TABLEIDX]]
; CHECK-NEXT:    [[SWITCH_LOAD:%.*]] = load i8, i8* [[SWITCH_GEP]], align 1
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    [[RETVAL_0:%.*]] = phi i8 [ [[SWITCH_LOAD]], [[SWITCH_LOOKUP]] ], [ 15, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i8 [[RETVAL_0]]
;
entry:
  switch i32 %c, label %sw.default [
  i32 42, label %return
  i32 43, label %sw.bb1
  i32 44, label %sw.bb2
  i32 45, label %sw.bb3
  i32 46, label %sw.bb4
  i32 47, label %sw.bb5
  i32 48, label %sw.bb6
  i32 49, label %sw.bb7
  i32 50, label %sw.bb8
  ]

sw.bb1: br label %return
sw.bb2: br label %return
sw.bb3: br label %return
sw.bb4: br label %return
sw.bb5: br label %return
sw.bb6: br label %return
sw.bb7: br label %return
sw.bb8: br label %return
sw.default: br label %return
return:
  %retval.0 = phi i8 [ 15, %sw.default ], [ 84, %sw.bb8 ], [ 33, %sw.bb7 ], [ 1, %sw.bb6 ], [ 62, %sw.bb5 ], [ 27, %sw.bb4 ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
  ret i8 %retval.0

}

; A switch used to initialize two variables, an i8 and a float.

declare void @dummy(i8 signext, float)
define void @h(i32 %x) {
; CHECK-LABEL: @h(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i32 [[X:%.*]], 4
; CHECK-NEXT:    br i1 [[TMP0]], label [[SWITCH_LOOKUP:%.*]], label [[SW_EPILOG:%.*]]
; CHECK:       switch.lookup:
; CHECK-NEXT:    [[SWITCH_SHIFTAMT:%.*]] = mul i32 [[X]], 8
; CHECK-NEXT:    [[SWITCH_DOWNSHIFT:%.*]] = lshr i32 89655594, [[SWITCH_SHIFTAMT]]
; CHECK-NEXT:    [[SWITCH_MASKED:%.*]] = trunc i32 [[SWITCH_DOWNSHIFT]] to i8
; CHECK-NEXT:    [[SWITCH_GEP:%.*]] = getelementptr inbounds [4 x float], [4 x float]* @switch.table.h, i32 0, i32 [[X]]
; CHECK-NEXT:    [[SWITCH_LOAD:%.*]] = load float, float* [[SWITCH_GEP]], align 4
; CHECK-NEXT:    br label [[SW_EPILOG]]
; CHECK:       sw.epilog:
; CHECK-NEXT:    [[A_0:%.*]] = phi i8 [ [[SWITCH_MASKED]], [[SWITCH_LOOKUP]] ], [ 7, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[B_0:%.*]] = phi float [ [[SWITCH_LOAD]], [[SWITCH_LOOKUP]] ], [ 0x4023FAE140000000, [[ENTRY]] ]
; CHECK-NEXT:    call void @dummy(i8 signext [[A_0]], float [[B_0]])
; CHECK-NEXT:    ret void
;
entry:
  switch i32 %x, label %sw.default [
  i32 0, label %sw.epilog
  i32 1, label %sw.bb1
  i32 2, label %sw.bb2
  i32 3, label %sw.bb3
  ]

sw.bb1: br label %sw.epilog
sw.bb2: br label %sw.epilog
sw.bb3: br label %sw.epilog
sw.default: br label %sw.epilog

sw.epilog:
  %a.0 = phi i8 [ 7, %sw.default ], [ 5, %sw.bb3 ], [ 88, %sw.bb2 ], [ 9, %sw.bb1 ], [ 42, %entry ]
  %b.0 = phi float [ 0x4023FAE140000000, %sw.default ], [ 0x4001AE1480000000, %sw.bb3 ], [ 0x4012449BA0000000, %sw.bb2 ], [ 0x3FF3BE76C0000000, %sw.bb1 ], [ 0x40091EB860000000, %entry ]
  call void @dummy(i8 signext %a.0, float %b.0)
  ret void

}


; Switch used to return a string.

@.str = private unnamed_addr constant [4 x i8] c"foo\00", align 1
@.str1 = private unnamed_addr constant [4 x i8] c"bar\00", align 1
@.str2 = private unnamed_addr constant [4 x i8] c"baz\00", align 1
@.str3 = private unnamed_addr constant [4 x i8] c"qux\00", align 1
@.str4 = private unnamed_addr constant [6 x i8] c"error\00", align 1

define i8* @foostring(i32 %x)  {
; CHECK-LABEL: @foostring(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i32 [[X:%.*]], 4
; CHECK-NEXT:    br i1 [[TMP0]], label [[SWITCH_LOOKUP:%.*]], label [[RETURN:%.*]]
; CHECK:       switch.lookup:
; CHECK-NEXT:    [[SWITCH_GEP:%.*]] = getelementptr inbounds [4 x i8*], [4 x i8*]* @switch.table.foostring, i32 0, i32 [[X]]
; CHECK-NEXT:    [[SWITCH_LOAD:%.*]] = load i8*, i8** [[SWITCH_GEP]], align 8
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    [[RETVAL_0:%.*]] = phi i8* [ [[SWITCH_LOAD]], [[SWITCH_LOOKUP]] ], [ getelementptr inbounds ([6 x i8], [6 x i8]* @.str4, i64 0, i64 0), [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i8* [[RETVAL_0]]
;
entry:
  switch i32 %x, label %sw.default [
  i32 0, label %return
  i32 1, label %sw.bb1
  i32 2, label %sw.bb2
  i32 3, label %sw.bb3
  ]

sw.bb1: br label %return
sw.bb2: br label %return
sw.bb3: br label %return
sw.default: br label %return

return:
  %retval.0 = phi i8* [ getelementptr inbounds ([6 x i8], [6 x i8]* @.str4, i64 0, i64 0), %sw.default ],
  [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str3, i64 0, i64 0), %sw.bb3 ],
  [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str2, i64 0, i64 0), %sw.bb2 ],
  [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0), %sw.bb1 ],
  [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), %entry ]
  ret i8* %retval.0

}