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llvm-project/llvm/test/Analysis/LoopAccessAnalysis/stride-access-dependence.ll

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; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
; Following cases are no dependence.
; void nodep_Read_Write(int *A) {
; int *B = A + 1;
; for (unsigned i = 0; i < 1024; i+=3)
; B[i] = A[i] + 1;
; }
; CHECK: function 'nodep_Read_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Run-time memory checks:
define void @nodep_Read_Write(i32* nocapture %A) {
entry:
%add.ptr = getelementptr inbounds i32, i32* %A, i64 1
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, 1
%arrayidx2 = getelementptr inbounds i32, i32* %add.ptr, i64 %indvars.iv
store i32 %add, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 3
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; int nodep_Write_Read(int *A) {
; int sum = 0;
; for (unsigned i = 0; i < 1024; i+=4) {
; A[i] = i;
; sum += A[i+3];
; }
;
; return sum;
; }
; CHECK: function 'nodep_Write_Read':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Run-time memory checks:
define i32 @nodep_Write_Read(i32* nocapture %A) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret i32 %add3
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%sum.013 = phi i32 [ 0, %entry ], [ %add3, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%1 = or i64 %indvars.iv, 3
%arrayidx2 = getelementptr inbounds i32, i32* %A, i64 %1
%2 = load i32, i32* %arrayidx2, align 4
%add3 = add nsw i32 %2, %sum.013
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 4
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; void nodep_Write_Write(int *A) {
; for (unsigned i = 0; i < 1024; i+=2) {
; A[i] = i;
; A[i+1] = i+1;
; }
; }
; CHECK: function 'nodep_Write_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Run-time memory checks:
define void @nodep_Write_Write(i32* nocapture %A) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%1 = or i64 %indvars.iv, 1
%arrayidx3 = getelementptr inbounds i32, i32* %A, i64 %1
%2 = trunc i64 %1 to i32
store i32 %2, i32* %arrayidx3, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; Following cases are unsafe depdences and are not vectorizable.
; void unsafe_Read_Write(int *A) {
; for (unsigned i = 0; i < 1024; i+=3)
; A[i+3] = A[i] + 1;
; }
; CHECK: function 'unsafe_Read_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: %0 = load i32, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %add, i32* %arrayidx3, align 4
define void @unsafe_Read_Write(i32* nocapture %A) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%i.010 = phi i32 [ 0, %entry ], [ %add1, %for.body ]
%idxprom = zext i32 %i.010 to i64
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %idxprom
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, 1
%add1 = add i32 %i.010, 3
%idxprom2 = zext i32 %add1 to i64
%arrayidx3 = getelementptr inbounds i32, i32* %A, i64 %idxprom2
store i32 %add, i32* %arrayidx3, align 4
%cmp = icmp ult i32 %add1, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; int unsafe_Write_Read(int *A) {
; int sum = 0;
; for (unsigned i = 0; i < 1024; i+=4) {
; A[i] = i;
; sum += A[i+4];
; }
;
; return sum;
; }
; CHECK: function 'unsafe_Write_Read':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: store i32 %0, i32* %arrayidx, align 4 ->
; CHECK-NEXT: %1 = load i32, i32* %arrayidx2, align 4
define i32 @unsafe_Write_Read(i32* nocapture %A) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret i32 %add3
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%sum.013 = phi i32 [ 0, %entry ], [ %add3, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 4
%arrayidx2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
%1 = load i32, i32* %arrayidx2, align 4
%add3 = add nsw i32 %1, %sum.013
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; void unsafe_Write_Write(int *A) {
; for (unsigned i = 0; i < 1024; i+=2) {
; A[i] = i;
; A[i+2] = i+1;
; }
; }
; CHECK: function 'unsafe_Write_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: store i32 %0, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %2, i32* %arrayidx3, align 4
define void @unsafe_Write_Write(i32* nocapture %A) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%1 = or i64 %indvars.iv, 1
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%arrayidx3 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
%2 = trunc i64 %1 to i32
store i32 %2, i32* %arrayidx3, align 4
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; Following cases check that strided accesses can be vectorized.
; void vectorizable_Read_Write(int *A) {
; int *B = A + 4;
; for (unsigned i = 0; i < 1024; i+=2)
; B[i] = A[i] + 1;
; }
; CHECK: function 'vectorizable_Read_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: BackwardVectorizable:
; CHECK-NEXT: %0 = load i32, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %add, i32* %arrayidx2, align 4
define void @vectorizable_Read_Write(i32* nocapture %A) {
entry:
%add.ptr = getelementptr inbounds i32, i32* %A, i64 4
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, 1
%arrayidx2 = getelementptr inbounds i32, i32* %add.ptr, i64 %indvars.iv
store i32 %add, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; int vectorizable_Write_Read(int *A) {
; int *B = A + 4;
; int sum = 0;
; for (unsigned i = 0; i < 1024; i+=2) {
; A[i] = i;
; sum += B[i];
; }
;
; return sum;
; }
; CHECK: function 'vectorizable_Write_Read':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: BackwardVectorizable:
; CHECK-NEXT: store i32 %0, i32* %arrayidx, align 4 ->
; CHECK-NEXT: %1 = load i32, i32* %arrayidx2, align 4
define i32 @vectorizable_Write_Read(i32* nocapture %A) {
entry:
%add.ptr = getelementptr inbounds i32, i32* %A, i64 4
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret i32 %add
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%sum.013 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %add.ptr, i64 %indvars.iv
%1 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %1, %sum.013
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; void vectorizable_Write_Write(int *A) {
; int *B = A + 4;
; for (unsigned i = 0; i < 1024; i+=2) {
; A[i] = i;
; B[i] = i+1;
; }
; }
; CHECK: function 'vectorizable_Write_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: BackwardVectorizable:
; CHECK-NEXT: store i32 %0, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %2, i32* %arrayidx2, align 4
define void @vectorizable_Write_Write(i32* nocapture %A) {
entry:
%add.ptr = getelementptr inbounds i32, i32* %A, i64 4
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%0 = trunc i64 %indvars.iv to i32
store i32 %0, i32* %arrayidx, align 4
%1 = or i64 %indvars.iv, 1
%arrayidx2 = getelementptr inbounds i32, i32* %add.ptr, i64 %indvars.iv
%2 = trunc i64 %1 to i32
store i32 %2, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; void vectorizable_unscaled_Read_Write(int *A) {
; int *B = (int *)((char *)A + 14);
; for (unsigned i = 0; i < 1024; i+=2)
; B[i] = A[i] + 1;
; }
; FIXME: This case looks like previous case @vectorizable_Read_Write. It sould
; be vectorizable.
; CHECK: function 'vectorizable_unscaled_Read_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: BackwardVectorizableButPreventsForwarding:
; CHECK-NEXT: %2 = load i32, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %add, i32* %arrayidx2, align 4
define void @vectorizable_unscaled_Read_Write(i32* nocapture %A) {
entry:
%0 = bitcast i32* %A to i8*
%add.ptr = getelementptr inbounds i8, i8* %0, i64 14
%1 = bitcast i8* %add.ptr to i32*
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%2 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %2, 1
%arrayidx2 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
store i32 %add, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; int vectorizable_unscaled_Write_Read(int *A) {
; int *B = (int *)((char *)A + 17);
; int sum = 0;
; for (unsigned i = 0; i < 1024; i+=2) {
; A[i] = i;
; sum += B[i];
; }
;
; return sum;
; }
; CHECK: function 'vectorizable_unscaled_Write_Read':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Memory dependences are safe
; CHECK-NEXT: Dependences:
; CHECK-NEXT: BackwardVectorizable:
; CHECK-NEXT: store i32 %2, i32* %arrayidx, align 4 ->
; CHECK-NEXT: %3 = load i32, i32* %arrayidx2, align 4
define i32 @vectorizable_unscaled_Write_Read(i32* nocapture %A) {
entry:
%0 = bitcast i32* %A to i8*
%add.ptr = getelementptr inbounds i8, i8* %0, i64 17
%1 = bitcast i8* %add.ptr to i32*
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret i32 %add
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%sum.013 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%2 = trunc i64 %indvars.iv to i32
store i32 %2, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
%3 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %3, %sum.013
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; void unsafe_unscaled_Read_Write(int *A) {
; int *B = (int *)((char *)A + 11);
; for (unsigned i = 0; i < 1024; i+=2)
; B[i] = A[i] + 1;
; }
; CHECK: function 'unsafe_unscaled_Read_Write':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: %2 = load i32, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %add, i32* %arrayidx2, align 4
define void @unsafe_unscaled_Read_Write(i32* nocapture %A) {
entry:
%0 = bitcast i32* %A to i8*
%add.ptr = getelementptr inbounds i8, i8* %0, i64 11
%1 = bitcast i8* %add.ptr to i32*
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%2 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %2, 1
%arrayidx2 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
store i32 %add, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; CHECK: function 'unsafe_unscaled_Read_Write2':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: %2 = load i32, i32* %arrayidx, align 4 ->
; CHECK-NEXT: store i32 %add, i32* %arrayidx2, align 4
; void unsafe_unscaled_Read_Write2(int *A) {
; int *B = (int *)((char *)A + 1);
; for (unsigned i = 0; i < 1024; i+=2)
; B[i] = A[i] + 1;
; }
define void @unsafe_unscaled_Read_Write2(i32* nocapture %A) {
entry:
%0 = bitcast i32* %A to i8*
%add.ptr = getelementptr inbounds i8, i8* %0, i64 1
%1 = bitcast i8* %add.ptr to i32*
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%2 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %2, 1
%arrayidx2 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
store i32 %add, i32* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp ult i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; Following case checks that interleaved stores have dependences with another
; store and can not pass dependence check.
; void interleaved_stores(int *A) {
; int *B = (int *) ((char *)A + 1);
; for(int i = 0; i < 1024; i+=2) {
; B[i] = i; // (1)
; A[i+1] = i + 1; // (2)
; B[i+1] = i + 1; // (3)
; }
; }
;
; The access (2) has overlaps with (1) and (3).
; CHECK: function 'interleaved_stores':
; CHECK-NEXT: for.body:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Backward:
; CHECK-NEXT: store i32 %4, i32* %arrayidx5, align 4 ->
; CHECK-NEXT: store i32 %4, i32* %arrayidx9, align 4
; CHECK: Backward:
; CHECK-NEXT: store i32 %2, i32* %arrayidx2, align 4 ->
; CHECK-NEXT: store i32 %4, i32* %arrayidx5, align 4
define void @interleaved_stores(i32* nocapture %A) {
entry:
%0 = bitcast i32* %A to i8*
%incdec.ptr = getelementptr inbounds i8, i8* %0, i64 1
%1 = bitcast i8* %incdec.ptr to i32*
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%2 = trunc i64 %indvars.iv to i32
%arrayidx2 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
store i32 %2, i32* %arrayidx2, align 4
%3 = or i64 %indvars.iv, 1
%arrayidx5 = getelementptr inbounds i32, i32* %A, i64 %3
%4 = trunc i64 %3 to i32
store i32 %4, i32* %arrayidx5, align 4
%arrayidx9 = getelementptr inbounds i32, i32* %1, i64 %3
store i32 %4, i32* %arrayidx9, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
%cmp = icmp slt i64 %indvars.iv.next, 1024
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
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