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IRBuilder: Add RAII objects to reset insertion points or fast math flags.

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Inspired by the object from the SLPVectorizer. This found a minor bug in the
debug loc restoration in the vectorizer where the location of a following
instruction was attached instead of the location from the original instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-09-30 15:39:48 +00:00
parent 5a17a462cd
commit adb412daa4
4 changed files with 86 additions and 22 deletions
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36
unittests/IR/IRBuilderTest.cpp
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@@ -182,4 +182,40 @@ TEST_F(IRBuilderTest, FastMathFlags) {
}
TEST_F(IRBuilderTest, RAIIHelpersTest) {
IRBuilder<> Builder(BB);
EXPECT_FALSE(Builder.getFastMathFlags().allowReciprocal());
MDBuilder MDB(M->getContext());
MDNode *FPMathA = MDB.createFPMath(0.01);
MDNode *FPMathB = MDB.createFPMath(0.1);
Builder.SetDefaultFPMathTag(FPMathA);
{
IRBuilder<>::FastMathFlagGuard Guard(Builder);
FastMathFlags FMF;
FMF.setAllowReciprocal();
Builder.SetFastMathFlags(FMF);
Builder.SetDefaultFPMathTag(FPMathB);
EXPECT_TRUE(Builder.getFastMathFlags().allowReciprocal());
EXPECT_EQ(FPMathB, Builder.getDefaultFPMathTag());
}
EXPECT_FALSE(Builder.getFastMathFlags().allowReciprocal());
EXPECT_EQ(FPMathA, Builder.getDefaultFPMathTag());
Value *F = Builder.CreateLoad(GV);
{
IRBuilder<>::InsertPointGuard Guard(Builder);
Builder.SetInsertPoint(cast<Instruction>(F));
EXPECT_EQ(F, Builder.GetInsertPoint());
}
EXPECT_EQ(BB->end(), Builder.GetInsertPoint());
EXPECT_EQ(BB, Builder.GetInsertBlock());
}
}