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[LAA] Include MaxSafeDepDistBytes in the analysis print-out 

llvm-svn: 269508
This commit is contained in:
Adam Nemet 2016-05-13 22:49:13 +00:00
parent 4ad38b63d5
commit c62e554e9a
2 changed files with 40 additions and 0 deletions
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3
llvm/lib/Analysis/LoopAccessAnalysis.cpp
View File

@ -1874,6 +1874,9 @@ LoopAccessInfo::LoopAccessInfo(Loop *L, ScalarEvolution *SE,
void LoopAccessInfo::print(raw_ostream &OS, unsigned Depth) const {
if (CanVecMem) {
OS.indent(Depth) << "Memory dependences are safe";
if (MaxSafeDepDistBytes != -1U)
OS << " with a maximum dependence distance of " << MaxSafeDepDistBytes
<< " bytes";
if (PtrRtChecking.Need)
OS << " with run-time checks";
OS << "\n";

37
llvm/test/Analysis/LoopAccessAnalysis/safe-with-dep-distance.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
; Analyze this loop:
; for (i = 0; i < n; i++)
; A[i + 4] = A[i] * 2;
; CHECK: Memory dependences are safe with a maximum dependence distance of 8 bytes
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.10.0"
@A = common global i16* null, align 8
define void @f() {
entry:
%a = load i16*, i16** @A, align 8
br label %for.body
for.body: ; preds = %for.body, %entry
%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
%loadA = load i16, i16* %arrayidxA, align 2
%mul = mul i16 %loadA, 2
%next = add nuw nsw i64 %ind, 4
%arrayidxA_next = getelementptr inbounds i16, i16* %a, i64 %next
store i16 %mul, i16* %arrayidxA_next, align 2
%add = add nuw nsw i64 %ind, 1
%exitcond = icmp eq i64 %add, 20
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}