test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -dse -S | FileCheck %s

@BUFFER = external local_unnamed_addr global [0 x i8], align 1

define void @ArrayTestFullyOverlapping(i64 %0) {
;
; The DSE pass will try to kill the store of size i32 using the store of
; size i64 because they fully overlap, in fact:
;
; - they use the same base pointer (in SCEV style '@BUFFER + %0')
; - the offset between the two stores is 32 bits
; - the size of the earlier store is 32 bits
; - the size of the later store is 64 bits
;
; CHECK-LABEL: @ArrayTestFullyOverlapping(
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[TMP0:%.*]], -8
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 [[TMP2]]
; CHECK-NEXT:    [[TMP4:%.*]] = bitcast i8* [[TMP3]] to i64*
; CHECK-NEXT:    store i64 0, i64* [[TMP4]], align 4
; CHECK-NEXT:    ret void
;
  %2 = add i64 %0, -8
  %3 = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 %2
  %4 = bitcast i8* %3 to i64*
  %5 = add i64 %0, -4
  %6 = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 %5
  %7 = bitcast i8* %6 to i32*
  store i32 1, i32* %7
  store i64 0, i64* %4
  ret void
}

define void @VectorTestFullyOverlapping(float* %arg, i32 %i) {
; CHECK-LABEL: @VectorTestFullyOverlapping(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    [[I2:%.*]] = zext i32 [[I:%.*]] to i64
; CHECK-NEXT:    [[I3:%.*]] = getelementptr inbounds float, float* [[ARG:%.*]], i64 [[I2]]
; CHECK-NEXT:    [[I4:%.*]] = bitcast float* [[I3]] to <2 x float>*
; CHECK-NEXT:    store <2 x float> zeroinitializer, <2 x float>* [[I4]], align 16
; CHECK-NEXT:    ret void
;
bb:
  %i7 = add nuw nsw i32 %i, 1
  %i8 = zext i32 %i7 to i64
  %i9 = getelementptr inbounds float, float* %arg, i64 %i8
  store float 0.0, float* %i9, align 4
  %i2 = zext i32 %i to i64
  %i3 = getelementptr inbounds float, float* %arg, i64 %i2
  %i4 = bitcast float* %i3 to <2 x float>*
  store <2 x float> <float 0.0, float 0.0>, <2 x float>* %i4, align 16
  ret void
}

define void @ArrayTestPartiallyOverlapping(i64 %0) {
;
; The DSE pass will not kill the store because the overlap is partial
; and won't fully clobber the i32 store.
;
; CHECK-LABEL: @ArrayTestPartiallyOverlapping(
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[TMP0:%.*]], 10
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 [[TMP2]]
; CHECK-NEXT:    [[TMP4:%.*]] = bitcast i8* [[TMP3]] to i64*
; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[TMP0]], 15
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 [[TMP5]]
; CHECK-NEXT:    [[TMP7:%.*]] = bitcast i8* [[TMP6]] to i32*
; CHECK-NEXT:    store i32 1, i32* [[TMP7]], align 4
; CHECK-NEXT:    store i64 0, i64* [[TMP4]], align 4
; CHECK-NEXT:    ret void
;
  %2 = add i64 %0, 10
  %3 = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 %2
  %4 = bitcast i8* %3 to i64*
  %5 = add i64 %0, 15
  %6 = getelementptr inbounds [0 x i8], [0 x i8]* @BUFFER, i64 0, i64 %5
  %7 = bitcast i8* %6 to i32*
  store i32 1, i32* %7
  store i64 0, i64* %4
  ret void
}

define void @VectorTestPartiallyOverlapping(float* %arg, i32 %i) {
;
; The DSE pass will not kill the store because the overlap is partial
; and won't fully clobber the original store.
;
; CHECK-LABEL: @VectorTestPartiallyOverlapping(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    [[I2:%.*]] = zext i32 [[I:%.*]] to i64
; CHECK-NEXT:    [[I3:%.*]] = getelementptr inbounds float, float* [[ARG:%.*]], i64 [[I2]]
; CHECK-NEXT:    [[I4:%.*]] = bitcast float* [[I3]] to <2 x float>*
; CHECK-NEXT:    store <2 x float> <float 1.000000e+00, float 1.000000e+00>, <2 x float>* [[I4]], align 16
; CHECK-NEXT:    [[I5:%.*]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT:    [[I6:%.*]] = zext i32 [[I5]] to i64
; CHECK-NEXT:    [[I7:%.*]] = getelementptr inbounds float, float* [[ARG]], i64 [[I6]]
; CHECK-NEXT:    [[I8:%.*]] = bitcast float* [[I7]] to <2 x float>*
; CHECK-NEXT:    store <2 x float> zeroinitializer, <2 x float>* [[I8]], align 16
; CHECK-NEXT:    ret void
;
bb:
  %i2 = zext i32 %i to i64
  %i3 = getelementptr inbounds float, float* %arg, i64 %i2
  %i4 = bitcast float* %i3 to <2 x float>*
  store <2 x float> <float 1.000000e+00, float 1.000000e+00>, <2 x float>* %i4, align 16
  %i5 = add nuw nsw i32 %i, 1
  %i6 = zext i32 %i5 to i64
  %i7 = getelementptr inbounds float, float* %arg, i64 %i6
  %i8 = bitcast float* %i7 to <2 x float>*
  store <2 x float> <float 0.0, float 0.0>, <2 x float>* %i8, align 16
  ret void
}