diff options
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 5 | ||||
| -rw-r--r-- | test/Analysis/ScalarEvolution/trip-count12.ll | 35 |
2 files changed, 38 insertions, 2 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index f65cf34..b940d93 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -6228,8 +6228,9 @@ ScalarEvolution::HowManyLessThans(const SCEV *LHS, const SCEV *RHS, return getCouldNotCompute(); // Check to see if we have a flag which makes analysis easy. - bool NoWrap = isSigned ? AddRec->getNoWrapFlags(SCEV::FlagNSW) : - AddRec->getNoWrapFlags(SCEV::FlagNUW); + bool NoWrap = isSigned ? + AddRec->getNoWrapFlags((SCEV::NoWrapFlags)(SCEV::FlagNSW | SCEV::FlagNW)) : + AddRec->getNoWrapFlags((SCEV::NoWrapFlags)(SCEV::FlagNUW | SCEV::FlagNW)); if (AddRec->isAffine()) { unsigned BitWidth = getTypeSizeInBits(AddRec->getType()); diff --git a/test/Analysis/ScalarEvolution/trip-count12.ll b/test/Analysis/ScalarEvolution/trip-count12.ll new file mode 100644 index 0000000..8f960e1 --- /dev/null +++ b/test/Analysis/ScalarEvolution/trip-count12.ll @@ -0,0 +1,35 @@ +; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s + +; CHECK: Determining loop execution counts for: @test +; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2) +; CHECK: Loop %for.body: max backedge-taken count is 1073741823 + +define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly { +entry: + %cmp2 = icmp sgt i32 %len, 1 + br i1 %cmp2, label %for.body.preheader, label %for.end + +for.body.preheader: ; preds = %entry + br label %for.body + +for.body: ; preds = %for.body, %for.body.preheader + %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %for.body.preheader ] + %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %for.body.preheader ] + %res.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ] + %incdec.ptr = getelementptr inbounds i16* %p.addr.05, i32 1 + %0 = load i16* %p.addr.05, align 2 + %conv = zext i16 %0 to i32 + %add = add i32 %conv, %res.03 + %sub = add nsw i32 %len.addr.04, -2 + %cmp = icmp sgt i32 %sub, 1 + br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge + +for.cond.for.end_crit_edge: ; preds = %for.body + %extract.t = trunc i32 %add to i16 + br label %for.end + +for.end: ; preds = %for.cond.for.end_crit_edge, %entry + %res.0.lcssa.off0 = phi i16 [ %extract.t, %for.cond.for.end_crit_edge ], [ 0, %entry ] + ret i16 %res.0.lcssa.off0 +} + |