llvm/test/Transforms/IndVarSimplify/pr45835.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=indvars -replexitval=always -S | FileCheck %s --check-prefix=ALWAYS
; RUN: opt < %s -passes=indvars -replexitval=never -S | FileCheck %s --check-prefix=NEVER
; RUN: opt < %s -passes=indvars -replexitval=cheap -scev-cheap-expansion-budget=1 -S | FileCheck %s --check-prefix=CHEAP

; rewriteLoopExitValues() must rewrite all or none of a PHI's values from a given block.

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

@a = common global i8 0, align 1

define internal fastcc void @d(ptr %c) unnamed_addr #0 {
; ALWAYS-LABEL: @d(
; ALWAYS-NEXT:  entry:
; ALWAYS-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds i8, ptr [[C:%.*]], i64 -65535
; ALWAYS-NEXT:    [[TMP0:%.*]] = icmp ugt ptr [[C]], @a
; ALWAYS-NEXT:    [[UMAX:%.*]] = select i1 [[TMP0]], ptr [[C]], ptr @a
; ALWAYS-NEXT:    br label [[WHILE_COND:%.*]]
; ALWAYS:       while.cond:
; ALWAYS-NEXT:    br i1 false, label [[CONT:%.*]], label [[WHILE_END_LOOPEXIT:%.*]]
; ALWAYS:       cont:
; ALWAYS-NEXT:    switch i64 0, label [[WHILE_COND]] [
; ALWAYS-NEXT:    i64 -1, label [[HANDLER_POINTER_OVERFLOW_I:%.*]]
; ALWAYS-NEXT:    i64 0, label [[HANDLER_POINTER_OVERFLOW_I]]
; ALWAYS-NEXT:    ]
; ALWAYS:       handler.pointer_overflow.i:
; ALWAYS-NEXT:    [[A_MUX_LCSSA4:%.*]] = phi ptr [ [[UMAX]], [[CONT]] ], [ [[UMAX]], [[CONT]] ]
; ALWAYS-NEXT:    [[X5:%.*]] = ptrtoint ptr [[A_MUX_LCSSA4]] to i64
; ALWAYS-NEXT:    br label [[WHILE_END:%.*]]
; ALWAYS:       while.end.loopexit:
; ALWAYS-NEXT:    br label [[WHILE_END]]
; ALWAYS:       while.end:
; ALWAYS-NEXT:    ret void
;
; NEVER-LABEL: @d(
; NEVER-NEXT:  entry:
; NEVER-NEXT:    [[CMP:%.*]] = icmp ule ptr [[C:%.*]], @a
; NEVER-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds i8, ptr [[C]], i64 -65535
; NEVER-NEXT:    br label [[WHILE_COND:%.*]]
; NEVER:       while.cond:
; NEVER-NEXT:    br i1 false, label [[CONT:%.*]], label [[WHILE_END_LOOPEXIT:%.*]]
; NEVER:       cont:
; NEVER-NEXT:    [[A_MUX:%.*]] = select i1 [[CMP]], ptr @a, ptr [[C]]
; NEVER-NEXT:    switch i64 0, label [[WHILE_COND]] [
; NEVER-NEXT:    i64 -1, label [[HANDLER_POINTER_OVERFLOW_I:%.*]]
; NEVER-NEXT:    i64 0, label [[HANDLER_POINTER_OVERFLOW_I]]
; NEVER-NEXT:    ]
; NEVER:       handler.pointer_overflow.i:
; NEVER-NEXT:    [[A_MUX_LCSSA4:%.*]] = phi ptr [ [[A_MUX]], [[CONT]] ], [ [[A_MUX]], [[CONT]] ]
; NEVER-NEXT:    [[X5:%.*]] = ptrtoint ptr [[A_MUX_LCSSA4]] to i64
; NEVER-NEXT:    br label [[WHILE_END:%.*]]
; NEVER:       while.end.loopexit:
; NEVER-NEXT:    br label [[WHILE_END]]
; NEVER:       while.end:
; NEVER-NEXT:    ret void
;
; CHEAP-LABEL: @d(
; CHEAP-NEXT:  entry:
; CHEAP-NEXT:    [[CMP:%.*]] = icmp ule ptr [[C:%.*]], @a
; CHEAP-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds i8, ptr [[C]], i64 -65535
; CHEAP-NEXT:    br label [[WHILE_COND:%.*]]
; CHEAP:       while.cond:
; CHEAP-NEXT:    br i1 false, label [[CONT:%.*]], label [[WHILE_END_LOOPEXIT:%.*]]
; CHEAP:       cont:
; CHEAP-NEXT:    [[A_MUX:%.*]] = select i1 [[CMP]], ptr @a, ptr [[C]]
; CHEAP-NEXT:    switch i64 0, label [[WHILE_COND]] [
; CHEAP-NEXT:    i64 -1, label [[HANDLER_POINTER_OVERFLOW_I:%.*]]
; CHEAP-NEXT:    i64 0, label [[HANDLER_POINTER_OVERFLOW_I]]
; CHEAP-NEXT:    ]
; CHEAP:       handler.pointer_overflow.i:
; CHEAP-NEXT:    [[A_MUX_LCSSA4:%.*]] = phi ptr [ [[A_MUX]], [[CONT]] ], [ [[A_MUX]], [[CONT]] ]
; CHEAP-NEXT:    [[X5:%.*]] = ptrtoint ptr [[A_MUX_LCSSA4]] to i64
; CHEAP-NEXT:    br label [[WHILE_END:%.*]]
; CHEAP:       while.end.loopexit:
; CHEAP-NEXT:    br label [[WHILE_END]]
; CHEAP:       while.end:
; CHEAP-NEXT:    ret void
;
entry:
  %cmp = icmp ule ptr %c, @a
  %add.ptr = getelementptr inbounds i8, ptr %c, i64 -65535
  br label %while.cond

while.cond:
  br i1 false, label %cont, label %while.end

cont:
  %a.mux = select i1 %cmp, ptr @a, ptr %c
  switch i64 0, label %while.cond [
  i64 -1, label %handler.pointer_overflow.i
  i64 0, label %handler.pointer_overflow.i
  ]

handler.pointer_overflow.i:
  %a.mux.lcssa4 = phi ptr [ %a.mux, %cont ], [ %a.mux, %cont ]
  %x5 = ptrtoint ptr %a.mux.lcssa4 to i64
  br label %while.end

while.end:
  ret void
}