nuudlman/llvm: llvm/test/Transforms/LoopUnroll/AArch64/unroll-optsize.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-unroll -mtriple=arm64-apple-iphoneos -S %s | FileCheck %s

; Check we unroll even with optsize, if the result is smaller, either because
; we have single iteration loops or bodies with constant folding opportunities
; after fully unrolling.

declare i32 @get()

define void @fully_unrolled_single_iteration(i32* %src) #0 {
; CHECK-LABEL: @fully_unrolled_single_iteration(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[SRC:%.*]]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT:    store i32 [[V]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT:    call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT:    ret void
;
entry:
  %arr = alloca [4 x i32], align 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %src.idx = getelementptr inbounds i32, i32* %src, i64 %indvars.iv
  %v = load i32, i32* %src.idx
  %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
  store i32 %v, i32* %arrayidx, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv.next, 1
  br i1 %exitcond, label %for.cond.cleanup, label %for.body

for.cond.cleanup:                                 ; preds = %for.cond
  %ptr = bitcast [4 x i32]* %arr to i32*
  call void @use(i32* nonnull %ptr) #4
  ret void
}


define void @fully_unrolled_smaller() #0 {
; CHECK-LABEL: @fully_unrolled_smaller(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT:    store i32 16, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
; CHECK-NEXT:    store i32 4104, i32* [[ARRAYIDX_1]], align 4
; CHECK-NEXT:    [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
; CHECK-NEXT:    store i32 1048592, i32* [[ARRAYIDX_2]], align 4
; CHECK-NEXT:    [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
; CHECK-NEXT:    store i32 268435480, i32* [[ARRAYIDX_3]], align 4
; CHECK-NEXT:    [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT:    call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT:    ret void
;
entry:
  %arr = alloca [4 x i32], align 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %indvars.iv.tr = trunc i64 %indvars.iv to i32
  %shl.0 = shl i32 %indvars.iv.tr, 3
  %shl.1 = shl i32 16, %shl.0
  %or = or i32 %shl.1, %shl.0
  %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
  store i32 %or, i32* %arrayidx, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv, 3
  br i1 %exitcond, label %for.cond.cleanup, label %for.body

for.cond.cleanup:                                 ; preds = %for.cond
  %ptr = bitcast [4 x i32]* %arr to i32*
  call void @use(i32* nonnull %ptr) #4
  ret void
}

define void @fully_unrolled_smaller_Oz() #1 {
; CHECK-LABEL: @fully_unrolled_smaller_Oz(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT:    store i32 16, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
; CHECK-NEXT:    store i32 4104, i32* [[ARRAYIDX_1]], align 4
; CHECK-NEXT:    [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
; CHECK-NEXT:    store i32 1048592, i32* [[ARRAYIDX_2]], align 4
; CHECK-NEXT:    [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
; CHECK-NEXT:    store i32 268435480, i32* [[ARRAYIDX_3]], align 4
; CHECK-NEXT:    [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT:    call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT:    ret void
;
entry:
  %arr = alloca [4 x i32], align 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %indvars.iv.tr = trunc i64 %indvars.iv to i32
  %shl.0 = shl i32 %indvars.iv.tr, 3
  %shl.1 = shl i32 16, %shl.0
  %or = or i32 %shl.1, %shl.0
  %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
  store i32 %or, i32* %arrayidx, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv, 3
  br i1 %exitcond, label %for.cond.cleanup, label %for.body

for.cond.cleanup:                                 ; preds = %for.cond
  %ptr = bitcast [4 x i32]* %arr to i32*
  call void @use(i32* nonnull %ptr) #4
  ret void
}


define void @fully_unrolled_bigger() #0 {
; CHECK-LABEL: @fully_unrolled_bigger(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_TR:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[SHL_0:%.*]] = shl i32 [[INDVARS_IV_TR]], 3
; CHECK-NEXT:    [[SHL_1:%.*]] = shl i32 16, [[SHL_0]]
; CHECK-NEXT:    [[OR:%.*]] = or i32 [[SHL_1]], [[SHL_0]]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT:    store i32 [[OR]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV]], 7
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
; CHECK:       for.cond.cleanup:
; CHECK-NEXT:    [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT:    call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT:    ret void
;
entry:
  %arr = alloca [4 x i32], align 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %indvars.iv.tr = trunc i64 %indvars.iv to i32
  %shl.0 = shl i32 %indvars.iv.tr, 3
  %shl.1 = shl i32 16, %shl.0
  %or = or i32 %shl.1, %shl.0
  %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
  store i32 %or, i32* %arrayidx, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv, 7
  br i1 %exitcond, label %for.cond.cleanup, label %for.body

for.cond.cleanup:                                 ; preds = %for.cond
  %ptr = bitcast [4 x i32]* %arr to i32*
  call void @use(i32* nonnull %ptr) #4
  ret void
}

declare void @use(i32*)

attributes #0 = { optsize }
attributes #1 = { minsize optsize }