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author | Sanjay Patel <spatel@rotateright.com> | 2018-11-02 18:14:24 +0000 |
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committer | Sanjay Patel <spatel@rotateright.com> | 2018-11-02 18:14:24 +0000 |
commit | 6892afb33a7162281ee8727071649133e905df8d (patch) | |
tree | 2cf152ae0f47e5a6443b32c56302a0907728bd2f /unittests | |
parent | 437cbaffffc74a5bb3bac31e7a649a144e14fdd4 (diff) |
[ValueTracking] add test for non-canonical shuffle; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346025 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'unittests')
-rw-r--r-- | unittests/Analysis/ValueTrackingTest.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/unittests/Analysis/ValueTrackingTest.cpp b/unittests/Analysis/ValueTrackingTest.cpp index f7d715c6447..e66d8f77fd4 100644 --- a/unittests/Analysis/ValueTrackingTest.cpp +++ b/unittests/Analysis/ValueTrackingTest.cpp @@ -514,6 +514,29 @@ TEST(ValueTracking, ComputeNumSignBits_Shuffle) { EXPECT_EQ(ComputeNumSignBits(RVal, M->getDataLayout()), 1u); } +// FIXME: +// No guarantees for canonical IR in this analysis, so a shuffle element that +// references an undef value means this can't return any extra information. +TEST(ValueTracking, ComputeNumSignBits_Shuffle2) { + StringRef Assembly = "define <2 x i32> @f(<2 x i1> %x) { " + " %sext = sext <2 x i1> %x to <2 x i32> " + " %val = shufflevector <2 x i32> %sext, <2 x i32> undef, <2 x i32> <i32 0, i32 2> " + " ret <2 x i32> %val " + "} "; + + LLVMContext Context; + SMDiagnostic Error; + auto M = parseAssemblyString(Assembly, Error, Context); + assert(M && "Bad assembly?"); + + auto *F = M->getFunction("f"); + assert(F && "Bad assembly?"); + + auto *RVal = + cast<ReturnInst>(F->getEntryBlock().getTerminator())->getOperand(0); + EXPECT_EQ(ComputeNumSignBits(RVal, M->getDataLayout()), 32u); +} + TEST(ValueTracking, ComputeKnownBits) { StringRef Assembly = "define i32 @f(i32 %a, i32 %b) { " " %ash = mul i32 %a, 8 " |