[CodeGen] Don't pretend we can expand f16 libcalls.

We used to mark a bunch of libm nodes as Expand for f16.  There are no
libcalls we can use for those, so we eventually just hit an unhelpful
llvm_unreachable in ExpandFPLibCall.

Instead, just ignore them altogether.  If nothing else changes, we'll
then get the more descriptive and pleasant "Cannot select" fatal error.

There's an argument to be made for consistency, but f16 is already
special in all the good ways, and as long as there's no f16 support in
the ops expander (this patch), as well as the Soften/Expand float
legalizers (which, when hit, will currently segfault), I think there's
no point in even pretending we can legalize any of this.

This shouldn't affect anything that's not already broken.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233328 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/TargetLoweringBase.cpp b/lib/CodeGen/TargetLoweringBase.cpp
index 89707007015d227f54184f24a1da8e79805abf6e..c5fe1c2afc9e606fa0d0c47766394efb0677364a 100644 (file)
--- a/lib/CodeGen/TargetLoweringBase.cpp
+++ b/lib/CodeGen/TargetLoweringBase.cpp
@@ -829,19 +829,6 @@ void TargetLoweringBase::initActions() {
   setOperationAction(ISD::ConstantFP, MVT::f128, Expand);
 
   // These library functions default to expand.
-  setOperationAction(ISD::FLOG ,  MVT::f16, Expand);
-  setOperationAction(ISD::FLOG2,  MVT::f16, Expand);
-  setOperationAction(ISD::FLOG10, MVT::f16, Expand);
-  setOperationAction(ISD::FEXP ,  MVT::f16, Expand);
-  setOperationAction(ISD::FEXP2,  MVT::f16, Expand);
-  setOperationAction(ISD::FFLOOR, MVT::f16, Expand);
-  setOperationAction(ISD::FMINNUM, MVT::f16, Expand);
-  setOperationAction(ISD::FMAXNUM, MVT::f16, Expand);
-  setOperationAction(ISD::FNEARBYINT, MVT::f16, Expand);
-  setOperationAction(ISD::FCEIL,  MVT::f16, Expand);
-  setOperationAction(ISD::FRINT,  MVT::f16, Expand);
-  setOperationAction(ISD::FTRUNC, MVT::f16, Expand);
-  setOperationAction(ISD::FROUND, MVT::f16, Expand);
   setOperationAction(ISD::FLOG ,  MVT::f32, Expand);
   setOperationAction(ISD::FLOG2,  MVT::f32, Expand);
   setOperationAction(ISD::FLOG10, MVT::f32, Expand);