llvm/test/Transforms/LoopIdiom/pr80954.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -S -passes=loop-idiom < %s | FileCheck %s

; Make sure this does not assert in SCEVExpander.

define void @test(ptr %p, i8 %arg, i64 %arg1, i32 %arg2) {
; CHECK-LABEL: define void @test(
; CHECK-SAME: ptr [[P:%.*]], i8 [[ARG:%.*]], i64 [[ARG1:%.*]], i32 [[ARG2:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SEXT:%.*]] = sext i8 [[ARG]] to i64
; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[ARG1]], -1
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[ARG2]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[ARG1]], [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[TMP1]], [[SEXT]]
; CHECK-NEXT:    [[TMP3:%.*]] = add i64 [[TMP2]], -1
; CHECK-NEXT:    [[TMP4:%.*]] = shl i64 [[TMP3]], 2
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IDIOM_IV:%.*]] = phi ptr [ [[SCEVGEP:%.*]], [[LATCH:%.*]] ], [ [[P]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[LATCH]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ [[ARG2]], [[ENTRY]] ], [ [[ADD9:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[TMP5:%.*]] = shl i64 [[INDVAR]], 2
; CHECK-NEXT:    [[TMP6:%.*]] = add i64 [[TMP4]], [[TMP5]]
; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 1 [[LOOP_IDIOM_IV]], i8 0, i64 0, i1 false)
; CHECK-NEXT:    br label [[LOOP2:%.*]]
; CHECK:       loop2:
; CHECK-NEXT:    [[IV2:%.*]] = phi i64 [ [[IV2_NEXT:%.*]], [[LOOP2]] ], [ 0, [[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr [4 x i8], ptr [[P]], i64 [[IV]], i64 [[IV2]]
; CHECK-NEXT:    [[IV2_NEXT]] = add i64 [[IV2]], 1
; CHECK-NEXT:    [[ICMP:%.*]] = icmp eq i64 [[IV2_NEXT]], 0
; CHECK-NEXT:    br i1 [[ICMP]], label [[LATCH]], label [[LOOP2]]
; CHECK:       latch:
; CHECK-NEXT:    [[ADD9]] = add nsw i32 [[PHI]], 1
; CHECK-NEXT:    [[SEXT10:%.*]] = sext i32 [[PHI]] to i64
; CHECK-NEXT:    [[ADD11:%.*]] = add i64 [[ADD]], [[SEXT10]]
; CHECK-NEXT:    [[ADD12:%.*]] = add i64 [[ADD11]], [[SEXT]]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[ADD12]], [[IV]]
; CHECK-NEXT:    [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; CHECK-NEXT:    [[SCEVGEP]] = getelementptr i8, ptr [[LOOP_IDIOM_IV]], i64 [[TMP6]]
; CHECK-NEXT:    br label [[LOOP]]
;
entry:
  %sext = sext i8 %arg to i64
  %add = add i64 %arg1, -1
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %latch ]
  %phi = phi i32 [ %arg2, %entry ], [ %add9, %latch ]
  br label %loop2

loop2:
  %iv2 = phi i64 [ %iv2.next, %loop2 ], [ 0, %loop ]
  %gep = getelementptr [4 x i8], ptr %p, i64 %iv, i64 %iv2
  store i8 0, ptr %gep, align 1
  %iv2.next = add i64 %iv2, 1
  %icmp = icmp eq i64 %iv2.next, 0
  br i1 %icmp, label %latch, label %loop2

latch:
  %add9 = add nsw i32 %phi, 1
  %sext10 = sext i32 %phi to i64
  %add11 = add i64 %add, %sext10
  %add12 = add i64 %add11, %sext
  %iv.next = add i64 %add12, %iv
  br label %loop
}