xref: /aosp_15_r20/external/llvm/test/Transforms/IndVarSimplify/lftr-extend-const.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

;RUN: opt -S %s -indvars | FileCheck %s

; Provide legal integer types.
target datalayout = "n8:16:32:64"


; CHECK-LABEL: @foo(
; CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16
; CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512
define void @foo() #0 {
entry:
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.01 = phi i16 [ 0, %entry ], [ %inc, %for.body ]
  %conv2 = sext i16 %i.01 to i32
  call void @bar(i32 %conv2) #1
  %inc = add i16 %i.01, 1
  %cmp = icmp slt i16 %inc, 512
  br i1 %cmp, label %for.body, label %for.end

for.end:                                          ; preds = %for.body
  ret void
}

; Check that post-incrementing the backedge taken count does not overflow.
; CHECK-LABEL: @postinc(
; CHECK: icmp eq i32 %indvars.iv, 255
define i32 @postinc() #0 {
entry:
  br label %do.body

do.body:                                          ; preds = %do.body, %entry
  %first.0 = phi i8 [ 0, %entry ], [ %inc, %do.body ]
  %conv = zext i8 %first.0 to i32
  call void  @bar(i32 %conv) #1
  %inc = add i8 %first.0, 1
  %cmp = icmp eq i8 %first.0, -1
  br i1 %cmp, label %do.end, label %do.body

do.end:                                           ; preds = %do.body
  ret i32 0
}

declare void @bar(i32)

attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }