49 lines
1.5 KiB
LLVM
49 lines
1.5 KiB
LLVM
; RUN: opt -basicaa -loop-accesses -analyze < %s | FileCheck %s
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; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s
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; In:
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;
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; store_ptr = A;
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; load_ptr = &A[2];
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; for (i = 0; i < n; i++)
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; *store_ptr++ = *load_ptr++ *10; // A[i] = A[i+2] * 10
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;
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; make sure, we look through the PHI to conclude that store_ptr and load_ptr
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; both have A as their underlying object. The dependence is safe for
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; vectorization requiring no memchecks.
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;
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; Otherwise we would try to prove independence with a memcheck that is going
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; to always fail.
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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; CHECK: Memory dependences are safe{{$}}
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define void @f(i8* noalias %A, i64 %width) {
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for.body.preheader:
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%A_ahead = getelementptr inbounds i8, i8* %A, i64 2
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br label %for.body
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for.body:
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%i = phi i64 [ %i.1, %for.body ], [ 0, %for.body.preheader ]
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%load_ptr = phi i8* [ %load_ptr.1, %for.body ], [ %A_ahead, %for.body.preheader ]
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%store_ptr = phi i8* [ %store_ptr.1, %for.body ], [ %A, %for.body.preheader ]
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%loadA = load i8, i8* %load_ptr, align 1
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%mul = mul i8 %loadA, 10
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store i8 %mul, i8* %store_ptr, align 1
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%load_ptr.1 = getelementptr inbounds i8, i8* %load_ptr, i64 1
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%store_ptr.1 = getelementptr inbounds i8, i8* %store_ptr, i64 1
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%i.1 = add nuw i64 %i, 1
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%exitcond = icmp eq i64 %i.1, %width
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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