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llvm-mirror/test/Transforms/MemCpyOpt/vscale-memset.ll
Huihui Zhang 7fbf09d073 [ValueTracking][SVE] Fix getOffsetFromIndex for scalable vector. 
Summary:
Return None if GEP index type is scalable vector. Size of scalable vectors
are multiplied by a runtime constant.

Avoid transforming:
  %a = bitcast i8* %p to <vscale x 16 x i8>*
  %tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 0
  store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp0
  %tmp1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 1
  store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp1

into:
  %a = bitcast i8* %p to <vscale x 16 x i8>*
  %tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 0
  %1 = bitcast <vscale x 16 x i8>* %tmp0 to i8*
  call void @llvm.memset.p0i8.i64(i8* align 16 %1, i8 0, i64 32, i1 false)

Reviewers: sdesmalen, efriedma, apazos, reames

Reviewed By: sdesmalen

Subscribers: tschuett, hiraditya, rkruppe, arphaman, psnobl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76464
2020-03-20 14:48:29 -07:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -memcpyopt -dce -S | FileCheck %s
; Negative test
; Check this test is not transformed into memset, or cause a compiler warning
; warning: Compiler has made implicit assumption that TypeSize is not scalable. This may or may not lead to broken code.
define void @foo(i8* %p) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[P:%.*]] to <vscale x 16 x i8>*
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* [[A]], i64 0
; CHECK-NEXT: store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* [[TMP0]]
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* [[A]], i64 1
; CHECK-NEXT: store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* [[TMP1]]
; CHECK-NEXT: ret void
;
%a = bitcast i8* %p to <vscale x 16 x i8>*
%tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 0
store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp0
%tmp1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 1
store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp1
ret void
}
; Positive test
define void @memset_vscale_index_zero(i8* %p, i8 %z) {
; CHECK-LABEL: @memset_vscale_index_zero(
; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[P:%.*]] to <vscale x 16 x i8>*
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* [[A]], i32 0, i32 0
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP0]], i8 [[Z:%.*]], i64 17, i1 false)
; CHECK-NEXT: ret void
;
%a = bitcast i8* %p to <vscale x 16 x i8>*
%tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 0
store i8 %z, i8* %tmp0
%tmp1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 1
store i8 %z, i8* %tmp1
%tmp2 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 2
store i8 %z, i8* %tmp2
%tmp3 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 3
store i8 %z, i8* %tmp3
%tmp4 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 4
store i8 %z, i8* %tmp4
%tmp5 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 5
store i8 %z, i8* %tmp5
%tmp6 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 6
store i8 %z, i8* %tmp6
%tmp7 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 7
store i8 %z, i8* %tmp7
%tmp8 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 8
store i8 %z, i8* %tmp8
%tmp9 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 9
store i8 %z, i8* %tmp9
%tmp10 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 10
store i8 %z, i8* %tmp10
%tmp11 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 11
store i8 %z, i8* %tmp11
%tmp12 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 12
store i8 %z, i8* %tmp12
%tmp13 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 13
store i8 %z, i8* %tmp13
%tmp14 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 14
store i8 %z, i8* %tmp14
%tmp15 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 15
store i8 %z, i8* %tmp15
%tmp16 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 0, i32 16
store i8 %z, i8* %tmp16
ret void
}
define void @memset_vscale_index_nonzero(i8* %p, i8 %z) {
; CHECK-LABEL: @memset_vscale_index_nonzero(
; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[P:%.*]] to <vscale x 16 x i8>*
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* [[A]], i32 1, i32 0
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP0]], i8 [[Z:%.*]], i64 17, i1 false)
; CHECK-NEXT: ret void
;
%a = bitcast i8* %p to <vscale x 16 x i8>*
%tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 0
store i8 %z, i8* %tmp0
%tmp1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 1
store i8 %z, i8* %tmp1
%tmp2 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 2
store i8 %z, i8* %tmp2
%tmp3 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 3
store i8 %z, i8* %tmp3
%tmp4 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 4
store i8 %z, i8* %tmp4
%tmp5 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 5
store i8 %z, i8* %tmp5
%tmp6 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 6
store i8 %z, i8* %tmp6
%tmp7 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 7
store i8 %z, i8* %tmp7
%tmp8 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 8
store i8 %z, i8* %tmp8
%tmp9 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 9
store i8 %z, i8* %tmp9
%tmp10 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 10
store i8 %z, i8* %tmp10
%tmp11 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 11
store i8 %z, i8* %tmp11
%tmp12 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 12
store i8 %z, i8* %tmp12
%tmp13 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 13
store i8 %z, i8* %tmp13
%tmp14 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 14
store i8 %z, i8* %tmp14
%tmp15 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 15
store i8 %z, i8* %tmp15
%tmp16 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i32 1, i32 16
store i8 %z, i8* %tmp16
ret void
}
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