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| author | Chris Lattner <sabre@nondot.org> | 2010-05-06 06:04:13 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-05-06 06:04:13 +0000 |
| commit | ed074150c9a775c5e2e1c4ececeba18ba880ce7d (patch) | |
| tree | d0c7b36043436e94022985808bc2365e25289bf9 /lib/CodeGen/CGBuiltin.cpp | |
| parent | 81368fbfd6d57150f66c993dc9041d62a7a32c4f (diff) | |
implement codegen support for __builtin_isfinite, part of PR6083
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@103168 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CGBuiltin.cpp')
| -rw-r--r-- | lib/CodeGen/CGBuiltin.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp index 651539f019..90fcb69828 100644 --- a/lib/CodeGen/CGBuiltin.cpp +++ b/lib/CodeGen/CGBuiltin.cpp @@ -362,6 +362,19 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, return RValue::get(Builder.CreateZExt(V, ConvertType(E->getType()), "tmp")); } + case Builtin::BI__builtin_isfinite: { + // isfinite(x) --> x == x && fabs(x) != infinity; } + Value *V = EmitScalarExpr(E->getArg(0)); + Value *Eq = Builder.CreateFCmpOEQ(V, V, "iseq"); + + Value *Abs = EmitFAbs(*this, V, E->getArg(0)->getType()); + Value *IsNotInf = + Builder.CreateFCmpUNE(Abs, ConstantFP::getInfinity(V->getType()),"isinf"); + + V = Builder.CreateAnd(Eq, IsNotInf, "and"); + return RValue::get(Builder.CreateZExt(V, ConvertType(E->getType()))); + } + case Builtin::BIalloca: case Builtin::BI__builtin_alloca: { // FIXME: LLVM IR Should allow alloca with an i64 size! |