| //===- ValueTrackingTest.cpp - ValueTracking tests ------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Analysis/ValueTracking.h" |
| #include "llvm/AsmParser/Parser.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/InstIterator.h" |
| #include "llvm/IR/LLVMContext.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/KnownBits.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "gtest/gtest.h" |
| |
| using namespace llvm; |
| |
| namespace { |
| |
| class ValueTrackingTest : public testing::Test { |
| protected: |
| std::unique_ptr<Module> parseModule(StringRef Assembly) { |
| SMDiagnostic Error; |
| std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context); |
| |
| std::string errMsg; |
| raw_string_ostream os(errMsg); |
| Error.print("", os); |
| EXPECT_TRUE(M) << os.str(); |
| |
| return M; |
| } |
| |
| void parseAssembly(StringRef Assembly) { |
| M = parseModule(Assembly); |
| ASSERT_TRUE(M); |
| |
| Function *F = M->getFunction("test"); |
| ASSERT_TRUE(F) << "Test must have a function @test"; |
| if (!F) |
| return; |
| |
| A = nullptr; |
| for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) { |
| if (I->hasName()) { |
| if (I->getName() == "A") |
| A = &*I; |
| } |
| } |
| ASSERT_TRUE(A) << "@test must have an instruction %A"; |
| } |
| |
| LLVMContext Context; |
| std::unique_ptr<Module> M; |
| Instruction *A = nullptr; |
| }; |
| |
| class MatchSelectPatternTest : public ValueTrackingTest { |
| protected: |
| void expectPattern(const SelectPatternResult &P) { |
| Value *LHS, *RHS; |
| Instruction::CastOps CastOp; |
| SelectPatternResult R = matchSelectPattern(A, LHS, RHS, &CastOp); |
| EXPECT_EQ(P.Flavor, R.Flavor); |
| EXPECT_EQ(P.NaNBehavior, R.NaNBehavior); |
| EXPECT_EQ(P.Ordered, R.Ordered); |
| } |
| }; |
| |
| class ComputeKnownBitsTest : public ValueTrackingTest { |
| protected: |
| void expectKnownBits(uint64_t Zero, uint64_t One) { |
| auto Known = computeKnownBits(A, M->getDataLayout()); |
| ASSERT_FALSE(Known.hasConflict()); |
| EXPECT_EQ(Known.One.getZExtValue(), One); |
| EXPECT_EQ(Known.Zero.getZExtValue(), Zero); |
| } |
| }; |
| |
| } |
| |
| TEST_F(MatchSelectPatternTest, SimpleFMin) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ult float %a, 5.0\n" |
| " %A = select i1 %1, float %a, float 5.0\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, SimpleFMax) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float %a, 5.0\n" |
| " %A = select i1 %1, float %a, float 5.0\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, SwappedFMax) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float 5.0, %a\n" |
| " %A = select i1 %1, float %a, float 5.0\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, SwappedFMax2) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float %a, 5.0\n" |
| " %A = select i1 %1, float 5.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, SwappedFMax3) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ult float %a, 5.0\n" |
| " %A = select i1 %1, float 5.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FastFMin) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp nnan olt float %a, 5.0\n" |
| " %A = select i1 %1, float %a, float 5.0\n" |
| " ret float %A\n" |
| "}\n"); |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_ANY, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinConstantZero) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ole float %a, 0.0\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // This shouldn't be matched, as %a could be -0.0. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinConstantZeroNsz) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp nsz ole float %a, 0.0\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // But this should be, because we've ignored signed zeroes. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero1) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float -0.0, %a\n" |
| " %A = select i1 %1, float 0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero2) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float %a, -0.0\n" |
| " %A = select i1 %1, float 0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero3) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float 0.0, %a\n" |
| " %A = select i1 %1, float -0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero4) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float %a, 0.0\n" |
| " %A = select i1 %1, float -0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero5) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float -0.0, %a\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero6) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float %a, -0.0\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero7) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float 0.0, %a\n" |
| " %A = select i1 %1, float %a, float -0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZero8) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float %a, 0.0\n" |
| " %A = select i1 %1, float %a, float -0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero1) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float -0.0, %a\n" |
| " %A = select i1 %1, float 0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_NAN, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero2) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float %a, -0.0\n" |
| " %A = select i1 %1, float 0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero3) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float 0.0, %a\n" |
| " %A = select i1 %1, float -0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_NAN, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero4) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float %a, 0.0\n" |
| " %A = select i1 %1, float -0.0, float %a\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero5) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float -0.0, %a\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero6) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float %a, -0.0\n" |
| " %A = select i1 %1, float %a, float 0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero7) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp olt float 0.0, %a\n" |
| " %A = select i1 %1, float %a, float -0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZero8) { |
| parseAssembly( |
| "define float @test(float %a) {\n" |
| " %1 = fcmp ogt float %a, 0.0\n" |
| " %A = select i1 %1, float %a, float -0.0\n" |
| " ret float %A\n" |
| "}\n"); |
| // The sign of zero doesn't matter in fcmp. |
| expectPattern({SPF_FMAXNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMinMismatchConstantZeroVecUndef) { |
| parseAssembly( |
| "define <2 x float> @test(<2 x float> %a) {\n" |
| " %1 = fcmp ogt <2 x float> %a, <float -0.0, float -0.0>\n" |
| " %A = select <2 x i1> %1, <2 x float> <float undef, float 0.0>, <2 x float> %a\n" |
| " ret <2 x float> %A\n" |
| "}\n"); |
| // An undef in a vector constant can not be back-propagated for this analysis. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, FMaxMismatchConstantZeroVecUndef) { |
| parseAssembly( |
| "define <2 x float> @test(<2 x float> %a) {\n" |
| " %1 = fcmp ogt <2 x float> %a, zeroinitializer\n" |
| " %A = select <2 x i1> %1, <2 x float> %a, <2 x float> <float -0.0, float undef>\n" |
| " ret <2 x float> %A\n" |
| "}\n"); |
| // An undef in a vector constant can not be back-propagated for this analysis. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, VectorFMinimum) { |
| parseAssembly( |
| "define <4 x float> @test(<4 x float> %a) {\n" |
| " %1 = fcmp ule <4 x float> %a, \n" |
| " <float 5.0, float 5.0, float 5.0, float 5.0>\n" |
| " %A = select <4 x i1> %1, <4 x float> %a,\n" |
| " <4 x float> <float 5.0, float 5.0, float 5.0, float 5.0>\n" |
| " ret <4 x float> %A\n" |
| "}\n"); |
| // Check that pattern matching works on vectors where each lane has the same |
| // unordered pattern. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_NAN, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, VectorFMinOtherOrdered) { |
| parseAssembly( |
| "define <4 x float> @test(<4 x float> %a) {\n" |
| " %1 = fcmp ole <4 x float> %a, \n" |
| " <float 5.0, float 5.0, float 5.0, float 5.0>\n" |
| " %A = select <4 x i1> %1, <4 x float> %a,\n" |
| " <4 x float> <float 5.0, float 5.0, float 5.0, float 5.0>\n" |
| " ret <4 x float> %A\n" |
| "}\n"); |
| // Check that pattern matching works on vectors where each lane has the same |
| // ordered pattern. |
| expectPattern({SPF_FMINNUM, SPNB_RETURNS_OTHER, true}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, VectorNotFMinimum) { |
| parseAssembly( |
| "define <4 x float> @test(<4 x float> %a) {\n" |
| " %1 = fcmp ule <4 x float> %a, \n" |
| " <float 5.0, float 0x7ff8000000000000, float 5.0, float 5.0>\n" |
| " %A = select <4 x i1> %1, <4 x float> %a,\n" |
| " <4 x float> <float 5.0, float 0x7ff8000000000000, float 5.0, float " |
| "5.0>\n" |
| " ret <4 x float> %A\n" |
| "}\n"); |
| // The lane that contains a NaN (0x7ff80...) behaves like a |
| // non-NaN-propagating min and the other lines behave like a NaN-propagating |
| // min, so check that neither is returned. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, VectorNotFMinZero) { |
| parseAssembly( |
| "define <4 x float> @test(<4 x float> %a) {\n" |
| " %1 = fcmp ule <4 x float> %a, \n" |
| " <float 5.0, float -0.0, float 5.0, float 5.0>\n" |
| " %A = select <4 x i1> %1, <4 x float> %a,\n" |
| " <4 x float> <float 5.0, float 0.0, float 5.0, float 5.0>\n" |
| " ret <4 x float> %A\n" |
| "}\n"); |
| // Always selects the second lane of %a if it is positive or negative zero, so |
| // this is stricter than a min. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, DoubleCastU) { |
| parseAssembly( |
| "define i32 @test(i8 %a, i8 %b) {\n" |
| " %1 = icmp ult i8 %a, %b\n" |
| " %2 = zext i8 %a to i32\n" |
| " %3 = zext i8 %b to i32\n" |
| " %A = select i1 %1, i32 %2, i32 %3\n" |
| " ret i32 %A\n" |
| "}\n"); |
| // We should be able to look through the situation where we cast both operands |
| // to the select. |
| expectPattern({SPF_UMIN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, DoubleCastS) { |
| parseAssembly( |
| "define i32 @test(i8 %a, i8 %b) {\n" |
| " %1 = icmp slt i8 %a, %b\n" |
| " %2 = sext i8 %a to i32\n" |
| " %3 = sext i8 %b to i32\n" |
| " %A = select i1 %1, i32 %2, i32 %3\n" |
| " ret i32 %A\n" |
| "}\n"); |
| // We should be able to look through the situation where we cast both operands |
| // to the select. |
| expectPattern({SPF_SMIN, SPNB_NA, false}); |
| } |
| |
| TEST_F(MatchSelectPatternTest, DoubleCastBad) { |
| parseAssembly( |
| "define i32 @test(i8 %a, i8 %b) {\n" |
| " %1 = icmp ult i8 %a, %b\n" |
| " %2 = zext i8 %a to i32\n" |
| " %3 = sext i8 %b to i32\n" |
| " %A = select i1 %1, i32 %2, i32 %3\n" |
| " ret i32 %A\n" |
| "}\n"); |
| // The cast types here aren't the same, so we cannot match an UMIN. |
| expectPattern({SPF_UNKNOWN, SPNB_NA, false}); |
| } |
| |
| TEST(ValueTracking, GuaranteedToTransferExecutionToSuccessor) { |
| StringRef Assembly = |
| "declare void @nounwind_readonly(i32*) nounwind readonly " |
| "declare void @nounwind_argmemonly(i32*) nounwind argmemonly " |
| "declare void @throws_but_readonly(i32*) readonly " |
| "declare void @throws_but_argmemonly(i32*) argmemonly " |
| "declare void @nounwind_willreturn(i32*) nounwind willreturn" |
| " " |
| "declare void @unknown(i32*) " |
| " " |
| "define void @f(i32* %p) { " |
| " call void @nounwind_readonly(i32* %p) " |
| " call void @nounwind_argmemonly(i32* %p) " |
| " call void @throws_but_readonly(i32* %p) " |
| " call void @throws_but_argmemonly(i32* %p) " |
| " call void @unknown(i32* %p) nounwind readonly " |
| " call void @unknown(i32* %p) nounwind argmemonly " |
| " call void @unknown(i32* %p) readonly " |
| " call void @unknown(i32* %p) argmemonly " |
| " call void @nounwind_willreturn(i32* %p)" |
| " ret void " |
| "} "; |
| |
| LLVMContext Context; |
| SMDiagnostic Error; |
| auto M = parseAssemblyString(Assembly, Error, Context); |
| assert(M && "Bad assembly?"); |
| |
| auto *F = M->getFunction("f"); |
| assert(F && "Bad assembly?"); |
| |
| auto &BB = F->getEntryBlock(); |
| bool ExpectedAnswers[] = { |
| true, // call void @nounwind_readonly(i32* %p) |
| true, // call void @nounwind_argmemonly(i32* %p) |
| false, // call void @throws_but_readonly(i32* %p) |
| false, // call void @throws_but_argmemonly(i32* %p) |
| true, // call void @unknown(i32* %p) nounwind readonly |
| true, // call void @unknown(i32* %p) nounwind argmemonly |
| false, // call void @unknown(i32* %p) readonly |
| false, // call void @unknown(i32* %p) argmemonly |
| true, // call void @nounwind_willreturn(i32* %p) |
| false, // ret void |
| }; |
| |
| int Index = 0; |
| for (auto &I : BB) { |
| EXPECT_EQ(isGuaranteedToTransferExecutionToSuccessor(&I), |
| ExpectedAnswers[Index]) |
| << "Incorrect answer at instruction " << Index << " = " << I; |
| Index++; |
| } |
| } |
| |
| TEST_F(ValueTrackingTest, ComputeNumSignBits_PR32045) { |
| parseAssembly( |
| "define i32 @test(i32 %a) {\n" |
| " %A = ashr i32 %a, -1\n" |
| " ret i32 %A\n" |
| "}\n"); |
| EXPECT_EQ(ComputeNumSignBits(A, M->getDataLayout()), 1u); |
| } |
| |
| // No guarantees for canonical IR in this analysis, so this just bails out. |
| TEST_F(ValueTrackingTest, ComputeNumSignBits_Shuffle) { |
| parseAssembly( |
| "define <2 x i32> @test() {\n" |
| " %A = shufflevector <2 x i32> undef, <2 x i32> undef, <2 x i32> <i32 0, i32 0>\n" |
| " ret <2 x i32> %A\n" |
| "}\n"); |
| EXPECT_EQ(ComputeNumSignBits(A, M->getDataLayout()), 1u); |
| } |
| |
| // 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_F(ValueTrackingTest, ComputeNumSignBits_Shuffle2) { |
| parseAssembly( |
| "define <2 x i32> @test(<2 x i1> %x) {\n" |
| " %sext = sext <2 x i1> %x to <2 x i32>\n" |
| " %A = shufflevector <2 x i32> %sext, <2 x i32> undef, <2 x i32> <i32 0, i32 2>\n" |
| " ret <2 x i32> %A\n" |
| "}\n"); |
| EXPECT_EQ(ComputeNumSignBits(A, M->getDataLayout()), 1u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownBits) { |
| parseAssembly( |
| "define i32 @test(i32 %a, i32 %b) {\n" |
| " %ash = mul i32 %a, 8\n" |
| " %aad = add i32 %ash, 7\n" |
| " %aan = and i32 %aad, 4095\n" |
| " %bsh = shl i32 %b, 4\n" |
| " %bad = or i32 %bsh, 6\n" |
| " %ban = and i32 %bad, 4095\n" |
| " %A = mul i32 %aan, %ban\n" |
| " ret i32 %A\n" |
| "}\n"); |
| expectKnownBits(/*zero*/ 4278190085u, /*one*/ 10u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownMulBits) { |
| parseAssembly( |
| "define i32 @test(i32 %a, i32 %b) {\n" |
| " %aa = shl i32 %a, 5\n" |
| " %bb = shl i32 %b, 5\n" |
| " %aaa = or i32 %aa, 24\n" |
| " %bbb = or i32 %bb, 28\n" |
| " %A = mul i32 %aaa, %bbb\n" |
| " ret i32 %A\n" |
| "}\n"); |
| expectKnownBits(/*zero*/ 95u, /*one*/ 32u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownFshl) { |
| // fshl(....1111....0000, 00..1111........, 6) |
| // = 11....000000..11 |
| parseAssembly( |
| "define i16 @test(i16 %a, i16 %b) {\n" |
| " %aa = shl i16 %a, 4\n" |
| " %bb = lshr i16 %b, 2\n" |
| " %aaa = or i16 %aa, 3840\n" |
| " %bbb = or i16 %bb, 3840\n" |
| " %A = call i16 @llvm.fshl.i16(i16 %aaa, i16 %bbb, i16 6)\n" |
| " ret i16 %A\n" |
| "}\n" |
| "declare i16 @llvm.fshl.i16(i16, i16, i16)\n"); |
| expectKnownBits(/*zero*/ 1008u, /*one*/ 49155u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownFshr) { |
| // fshr(....1111....0000, 00..1111........, 26) |
| // = 11....000000..11 |
| parseAssembly( |
| "define i16 @test(i16 %a, i16 %b) {\n" |
| " %aa = shl i16 %a, 4\n" |
| " %bb = lshr i16 %b, 2\n" |
| " %aaa = or i16 %aa, 3840\n" |
| " %bbb = or i16 %bb, 3840\n" |
| " %A = call i16 @llvm.fshr.i16(i16 %aaa, i16 %bbb, i16 26)\n" |
| " ret i16 %A\n" |
| "}\n" |
| "declare i16 @llvm.fshr.i16(i16, i16, i16)\n"); |
| expectKnownBits(/*zero*/ 1008u, /*one*/ 49155u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownFshlZero) { |
| // fshl(....1111....0000, 00..1111........, 0) |
| // = ....1111....0000 |
| parseAssembly( |
| "define i16 @test(i16 %a, i16 %b) {\n" |
| " %aa = shl i16 %a, 4\n" |
| " %bb = lshr i16 %b, 2\n" |
| " %aaa = or i16 %aa, 3840\n" |
| " %bbb = or i16 %bb, 3840\n" |
| " %A = call i16 @llvm.fshl.i16(i16 %aaa, i16 %bbb, i16 0)\n" |
| " ret i16 %A\n" |
| "}\n" |
| "declare i16 @llvm.fshl.i16(i16, i16, i16)\n"); |
| expectKnownBits(/*zero*/ 15u, /*one*/ 3840u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownUAddSatLeadingOnes) { |
| // uadd.sat(1111...1, ........) |
| // = 1111.... |
| parseAssembly( |
| "define i8 @test(i8 %a, i8 %b) {\n" |
| " %aa = or i8 %a, 241\n" |
| " %A = call i8 @llvm.uadd.sat.i8(i8 %aa, i8 %b)\n" |
| " ret i8 %A\n" |
| "}\n" |
| "declare i8 @llvm.uadd.sat.i8(i8, i8)\n"); |
| expectKnownBits(/*zero*/ 0u, /*one*/ 240u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownUAddSatOnesPreserved) { |
| // uadd.sat(00...011, .1...110) |
| // = .......1 |
| parseAssembly( |
| "define i8 @test(i8 %a, i8 %b) {\n" |
| " %aa = or i8 %a, 3\n" |
| " %aaa = and i8 %aa, 59\n" |
| " %bb = or i8 %b, 70\n" |
| " %bbb = and i8 %bb, 254\n" |
| " %A = call i8 @llvm.uadd.sat.i8(i8 %aaa, i8 %bbb)\n" |
| " ret i8 %A\n" |
| "}\n" |
| "declare i8 @llvm.uadd.sat.i8(i8, i8)\n"); |
| expectKnownBits(/*zero*/ 0u, /*one*/ 1u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownUSubSatLHSLeadingZeros) { |
| // usub.sat(0000...0, ........) |
| // = 0000.... |
| parseAssembly( |
| "define i8 @test(i8 %a, i8 %b) {\n" |
| " %aa = and i8 %a, 14\n" |
| " %A = call i8 @llvm.usub.sat.i8(i8 %aa, i8 %b)\n" |
| " ret i8 %A\n" |
| "}\n" |
| "declare i8 @llvm.usub.sat.i8(i8, i8)\n"); |
| expectKnownBits(/*zero*/ 240u, /*one*/ 0u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownUSubSatRHSLeadingOnes) { |
| // usub.sat(........, 1111...1) |
| // = 0000.... |
| parseAssembly( |
| "define i8 @test(i8 %a, i8 %b) {\n" |
| " %bb = or i8 %a, 241\n" |
| " %A = call i8 @llvm.usub.sat.i8(i8 %a, i8 %bb)\n" |
| " ret i8 %A\n" |
| "}\n" |
| "declare i8 @llvm.usub.sat.i8(i8, i8)\n"); |
| expectKnownBits(/*zero*/ 240u, /*one*/ 0u); |
| } |
| |
| TEST_F(ComputeKnownBitsTest, ComputeKnownUSubSatZerosPreserved) { |
| // usub.sat(11...011, .1...110) |
| // = ......0. |
| parseAssembly( |
| "define i8 @test(i8 %a, i8 %b) {\n" |
| " %aa = or i8 %a, 195\n" |
| " %aaa = and i8 %aa, 251\n" |
| " %bb = or i8 %b, 70\n" |
| " %bbb = and i8 %bb, 254\n" |
| " %A = call i8 @llvm.usub.sat.i8(i8 %aaa, i8 %bbb)\n" |
| " ret i8 %A\n" |
| "}\n" |
| "declare i8 @llvm.usub.sat.i8(i8, i8)\n"); |
| expectKnownBits(/*zero*/ 2u, /*one*/ 0u); |
| } |
| |
| class IsBytewiseValueTest : public ValueTrackingTest, |
| public ::testing::WithParamInterface< |
| std::pair<const char *, const char *>> { |
| protected: |
| }; |
| |
| const std::pair<const char *, const char *> IsBytewiseValueTests[] = { |
| { |
| "i8 0", |
| "i48* null", |
| }, |
| { |
| "i8 undef", |
| "i48* undef", |
| }, |
| { |
| "i8 0", |
| "i8 zeroinitializer", |
| }, |
| { |
| "i8 0", |
| "i8 0", |
| }, |
| { |
| "i8 -86", |
| "i8 -86", |
| }, |
| { |
| "i8 -1", |
| "i8 -1", |
| }, |
| { |
| "i8 undef", |
| "i16 undef", |
| }, |
| { |
| "i8 0", |
| "i16 0", |
| }, |
| { |
| "", |
| "i16 7", |
| }, |
| { |
| "i8 -86", |
| "i16 -21846", |
| }, |
| { |
| "i8 -1", |
| "i16 -1", |
| }, |
| { |
| "i8 0", |
| "i48 0", |
| }, |
| { |
| "i8 -1", |
| "i48 -1", |
| }, |
| { |
| "i8 0", |
| "i49 0", |
| }, |
| { |
| "", |
| "i49 -1", |
| }, |
| { |
| "i8 0", |
| "half 0xH0000", |
| }, |
| { |
| "i8 -85", |
| "half 0xHABAB", |
| }, |
| { |
| "i8 0", |
| "float 0.0", |
| }, |
| { |
| "i8 -1", |
| "float 0xFFFFFFFFE0000000", |
| }, |
| { |
| "i8 0", |
| "double 0.0", |
| }, |
| { |
| "i8 -15", |
| "double 0xF1F1F1F1F1F1F1F1", |
| }, |
| { |
| "i8 undef", |
| "i16* undef", |
| }, |
| { |
| "i8 0", |
| "i16* inttoptr (i64 0 to i16*)", |
| }, |
| { |
| "i8 -1", |
| "i16* inttoptr (i64 -1 to i16*)", |
| }, |
| { |
| "i8 -86", |
| "i16* inttoptr (i64 -6148914691236517206 to i16*)", |
| }, |
| { |
| "", |
| "i16* inttoptr (i48 -1 to i16*)", |
| }, |
| { |
| "i8 -1", |
| "i16* inttoptr (i96 -1 to i16*)", |
| }, |
| { |
| "i8 undef", |
| "[0 x i8] zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "[0 x i8] undef", |
| }, |
| { |
| "i8 undef", |
| "[5 x [0 x i8]] zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "[5 x [0 x i8]] undef", |
| }, |
| { |
| "i8 0", |
| "[6 x i8] zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "[6 x i8] undef", |
| }, |
| { |
| "i8 1", |
| "[5 x i8] [i8 1, i8 1, i8 1, i8 1, i8 1]", |
| }, |
| { |
| "", |
| "[5 x i64] [i64 1, i64 1, i64 1, i64 1, i64 1]", |
| }, |
| { |
| "i8 -1", |
| "[5 x i64] [i64 -1, i64 -1, i64 -1, i64 -1, i64 -1]", |
| }, |
| { |
| "", |
| "[4 x i8] [i8 1, i8 2, i8 1, i8 1]", |
| }, |
| { |
| "i8 1", |
| "[4 x i8] [i8 1, i8 undef, i8 1, i8 1]", |
| }, |
| { |
| "i8 0", |
| "<6 x i8> zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "<6 x i8> undef", |
| }, |
| { |
| "i8 1", |
| "<5 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1>", |
| }, |
| { |
| "", |
| "<5 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1>", |
| }, |
| { |
| "i8 -1", |
| "<5 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>", |
| }, |
| { |
| "", |
| "<4 x i8> <i8 1, i8 1, i8 2, i8 1>", |
| }, |
| { |
| "i8 5", |
| "<2 x i8> < i8 5, i8 undef >", |
| }, |
| { |
| "i8 0", |
| "[2 x [2 x i16]] zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "[2 x [2 x i16]] undef", |
| }, |
| { |
| "i8 -86", |
| "[2 x [2 x i16]] [[2 x i16] [i16 -21846, i16 -21846], " |
| "[2 x i16] [i16 -21846, i16 -21846]]", |
| }, |
| { |
| "", |
| "[2 x [2 x i16]] [[2 x i16] [i16 -21846, i16 -21846], " |
| "[2 x i16] [i16 -21836, i16 -21846]]", |
| }, |
| { |
| "i8 undef", |
| "{ } zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "{ } undef", |
| }, |
| { |
| "i8 undef", |
| "{ {}, {} } zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "{ {}, {} } undef", |
| }, |
| { |
| "i8 0", |
| "{i8, i64, i16*} zeroinitializer", |
| }, |
| { |
| "i8 undef", |
| "{i8, i64, i16*} undef", |
| }, |
| { |
| "i8 -86", |
| "{i8, i64, i16*} {i8 -86, i64 -6148914691236517206, i16* undef}", |
| }, |
| { |
| "", |
| "{i8, i64, i16*} {i8 86, i64 -6148914691236517206, i16* undef}", |
| }, |
| }; |
| |
| INSTANTIATE_TEST_CASE_P(IsBytewiseValueParamTests, IsBytewiseValueTest, |
| ::testing::ValuesIn(IsBytewiseValueTests),); |
| |
| TEST_P(IsBytewiseValueTest, IsBytewiseValue) { |
| auto M = parseModule(std::string("@test = global ") + GetParam().second); |
| GlobalVariable *GV = dyn_cast<GlobalVariable>(M->getNamedValue("test")); |
| Value *Actual = isBytewiseValue(GV->getInitializer(), M->getDataLayout()); |
| std::string Buff; |
| raw_string_ostream S(Buff); |
| if (Actual) |
| S << *Actual; |
| EXPECT_EQ(GetParam().first, S.str()); |
| } |
