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c5853844e0
Summary: http://reviews.llvm.org/D11212 made Scalar Evolution able to propagate NSW and NUW flags from instructions to SCEVs for add instructions. This patch expands that to sub, mul and shl instructions. This change makes LSR able to generate pointer induction variables for loops like these, where the index is 32 bit and the pointer is 64 bit: for (int i = 0; i < numIterations; ++i) sum += ptr[i - offset]; for (int i = 0; i < numIterations; ++i) sum += ptr[i * stride]; for (int i = 0; i < numIterations; ++i) sum += ptr[3 * (i << 7)]; Reviewers: atrick, sanjoy Subscribers: sanjoy, majnemer, hfinkel, llvm-commits, meheff, jingyue, eliben Differential Revision: http://reviews.llvm.org/D11860 llvm-svn: 245118
64 lines
2.6 KiB
LLVM
64 lines
2.6 KiB
LLVM
; RUN: opt < %s -analyze -delinearize | FileCheck %s
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;
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; void foo(long n, long m, long o, int A[n][m][o]) {
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; for (long i = 0; i < n; i++)
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; for (long j = 0; j < m; j++)
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; for (long k = 0; k < o; k++)
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; A[2*i+3][3*j-4][5*k+7] = 1;
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; }
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; AddRec: {{{(28 + (4 * (-4 + (3 * %m)) * %o) + %A),+,(8 * %m * %o)}<%for.i>,+,(12 * %o)}<%for.j>,+,20}<%for.k>
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; CHECK: Base offset: %A
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; CHECK: ArrayDecl[UnknownSize][%m][%o] with elements of 4 bytes.
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; CHECK: ArrayRef[{3,+,2}<%for.i>][{-4,+,3}<%for.j>][{7,+,5}<nw><%for.k>]
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define void @foo(i64 %n, i64 %m, i64 %o, i32* nocapture %A) #0 {
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entry:
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%cmp32 = icmp sgt i64 %n, 0
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br i1 %cmp32, label %for.cond1.preheader.lr.ph, label %for.end17
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for.cond1.preheader.lr.ph: ; preds = %entry
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%cmp230 = icmp sgt i64 %m, 0
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%cmp528 = icmp sgt i64 %o, 0
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br i1 %cmp230, label %for.i, label %for.end17
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for.inc15.us: ; preds = %for.inc12.us.us, %for.i
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%inc16.us = add nsw i64 %i.033.us, 1
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%exitcond55 = icmp eq i64 %inc16.us, %n
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br i1 %exitcond55, label %for.end17, label %for.i
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for.i: ; preds = %for.cond1.preheader.lr.ph, %for.inc15.us
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%i.033.us = phi i64 [ %inc16.us, %for.inc15.us ], [ 0, %for.cond1.preheader.lr.ph ]
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%mul8.us = shl i64 %i.033.us, 1
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%add9.us = add nsw i64 %mul8.us, 3
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%0 = mul i64 %add9.us, %m
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%sub.us = add i64 %0, -4
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br i1 %cmp528, label %for.j, label %for.inc15.us
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for.inc12.us.us: ; preds = %for.k
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%inc13.us.us = add nsw i64 %j.031.us.us, 1
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%exitcond54 = icmp eq i64 %inc13.us.us, %m
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br i1 %exitcond54, label %for.inc15.us, label %for.j
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for.j: ; preds = %for.i, %for.inc12.us.us
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%j.031.us.us = phi i64 [ %inc13.us.us, %for.inc12.us.us ], [ 0, %for.i ]
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%mul7.us.us = mul nsw i64 %j.031.us.us, 3
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%tmp.us.us = add i64 %sub.us, %mul7.us.us
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%tmp27.us.us = mul i64 %tmp.us.us, %o
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br label %for.k
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for.k: ; preds = %for.k, %for.j
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%k.029.us.us = phi i64 [ 0, %for.j ], [ %inc.us.us, %for.k ]
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%mul.us.us = mul nsw i64 %k.029.us.us, 5
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%arrayidx.sum.us.us = add i64 %mul.us.us, 7
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%arrayidx10.sum.us.us = add i64 %arrayidx.sum.us.us, %tmp27.us.us
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%arrayidx11.us.us = getelementptr inbounds i32, i32* %A, i64 %arrayidx10.sum.us.us
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store i32 1, i32* %arrayidx11.us.us, align 4
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%inc.us.us = add nsw i64 %k.029.us.us, 1
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%exitcond = icmp eq i64 %inc.us.us, %o
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br i1 %exitcond, label %for.inc12.us.us, label %for.k
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for.end17: ; preds = %for.inc15.us, %for.cond1.preheader.lr.ph, %entry
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ret void
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}
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