[PATCH] Add llvm.experimental.patchpoint.double

Andrew Trick atrick at apple.com
Thu Oct 9 13:46:33 PDT 2014

Juergen has a tablegen patch that allows multiple return types on the same intrinsic, which should do exactly what you want without any extra name mangling.


> On Oct 9, 2014, at 1:39 PM, Kevin Modzelewski <kmod at dropbox.com> wrote:
> Oh interesting, that seems to work -- assuming that other people like the approach, would you mind factoring out that part of your statepoint patch?
> On Thu, Oct 9, 2014 at 9:19 AM, Philip Reames <listmail at philipreames.com <mailto:listmail at philipreames.com>> wrote:
> On 10/08/2014 09:40 PM, Kevin Modzelewski wrote:
>> Hi atrick,
>> It didn't seem like there was anything special that had to be done besides
>> just defining the new intrinsic with the different return type.
>> It seems inelegant to create a new intrinsic for a new return type, but
>> we're running into a case where we'd like to return a double through a patchpoint
>> and I'm not sure of a better way to do that.
> You might want to take a look at how we defined the gc_result intrinsics in the statepoint patch which is currently up for review.  With some changes to the intrinsic name mangling, you can define an intrinsic per "family" of types.  The four we had to add were: void, int, pointer, float.  (float here means any floating point type, int means any integer type, etc..)
>> http://reviews.llvm.org/D5696 <http://reviews.llvm.org/D5696>
>> Files:
>>   docs/StackMaps.rst
>>   include/llvm/IR/Intrinsics.td
>>   lib/CodeGen/SelectionDAG/FastISel.cpp
>>   lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
>>   lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
>>   lib/IR/Verifier.cpp
>>   lib/Target/AArch64/AArch64TargetTransformInfo.cpp
>>   lib/Target/X86/X86TargetTransformInfo.cpp
>>   test/CodeGen/X86/patchpoint.ll
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