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Improve the remark generated when a variable that is used outside the loop is not a reduction or induction variable.

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Reviewed by Arnold Schwaighofer


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214440 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tyler Nowicki 2014-07-31 21:02:40 +00:00
parent 03c8d18ced
commit 88212074a8
2 changed files with 8 additions and 4 deletions
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7
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -3590,8 +3590,8 @@ bool LoopVectorizationLegality::canVectorizeInstrs() {
// identified reduction value with an outside user.
if (!hasOutsideLoopUser(TheLoop, it, AllowedExit))
continue;
emitAnalysis(Report(it) << "value that could not be identified as "
"reduction is used outside the loop");
emitAnalysis(Report(it) << "value could not be identified as "
"an induction or reduction variable");
return false;
}
@ -3676,7 +3676,8 @@ bool LoopVectorizationLegality::canVectorizeInstrs() {
continue;
}
emitAnalysis(Report(it) << "unvectorizable operation");
emitAnalysis(Report(it) << "value that could not be identified as "
"reduction is used outside the loop");
DEBUG(dbgs() << "LV: Found an unidentified PHI."<< *Phi <<"\n");
return false;
}// end of PHI handling

5
test/Transforms/LoopVectorize/no_outside_user.ll
View File

@ -1,4 +1,7 @@
; RUN: opt -S -loop-vectorize -force-vector-unroll=1 -force-vector-width=2 < %s | FileCheck %s
; RUN: opt -S -loop-vectorize -force-vector-unroll=1 -force-vector-width=2 -pass-remarks-analysis=loop-vectorize < %s 2>&1 | FileCheck %s
; CHECK: remark: {{.*}}: loop not vectorized: value could not be identified as an induction or reduction variable
; CHECK: remark: {{.*}}: loop not vectorized: use of induction value outside of the loop is not handled by vectorizer
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"