Displaying 7 results from an estimated 7 matches for "issplat".
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2009 Feb 23
0
[LLVMdev] [llvm-commits] [llvm] r65296 - in /llvm/trunk: include/llvm/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/CellSPU/ lib/Target/PowerPC/ lib/Target/X86/ test/CodeGen/X86/
....
>> 4. Move the helper functions from #2 back into ShuffleVectorSDNode.
>>
>
> I'm working on #2 and #3 right now, and hope to land something in the next
> couple days.
Details, since this has implications for vector machine backends?
I'm just not groking how moving isSplat to SDNode eliminates BUILD_VECTOR or
deals with constant vector formation. I like the idea of a
ShuffleVectorSDNode (moves things in the direction of a bijective ISD to
SDNode mapping), but eliminating BuildVectorSDNode in its entirety doesn't
deal with constant and variable vectors.
-scooter...
2009 Feb 23
2
[LLVMdev] [llvm-commits] [llvm] r65296 - in /llvm/trunk: include/llvm/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/CellSPU/ lib/Target/PowerPC/ lib/Target/X86/ test/CodeGen/X86/
On Feb 23, 2009, at 1:46 PM, Chris Lattner wrote:
> In my opinion, the proper direction for shuffles is:
>
> 1. Back out your patch.
> 2. Move the functionality of "is splat" etc to method somewhere, e.g.
> on SDNode.
> 3. Introduce a new ShuffleVectorSDNode that only has two SDValue
> operands (the two input vectors), but that also contains an array of
> ints in
2009 Feb 24
0
[LLVMdev] [llvm-commits] [llvm] r65296 - in /llvm/trunk: include/llvm/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/CellSPU/ lib/Target/PowerPC/ lib/Target/X86/ test/CodeGen/X86/
Duncan:
I'm still stymied how this whole thread ended up about shuffle vector nodes,
when the original problem was my build vector patch. I'm still working on
backing the build vector patch out (it isn't clean with all of the
intervening commits and I have pressing management tasks which command my
attention.)
-scooter
On Tue, Feb 24, 2009 at 12:28 AM, Duncan Sands <baldrick at
2009 Feb 24
3
[LLVMdev] [llvm-commits] [llvm] r65296 - in /llvm/trunk: include/llvm/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/CellSPU/ lib/Target/PowerPC/ lib/Target/X86/ test/CodeGen/X86/
> 3. Introduce a new ShuffleVectorSDNode that only has two SDValue
> operands (the two input vectors), but that also contains an array of
> ints in the node (not as operands).
...
> The important part of #3 is that we really want an array of ints
> (using -1 for undef) for the shuffle mask, not "operands". This
> eliminates the nastiness we have now were we
2009 Feb 24
3
[LLVMdev] [llvm-commits] [llvm] r65296 - in /llvm/trunk: include/llvm/CodeGen/ lib/CodeGen/SelectionDAG/ lib/Target/CellSPU/ lib/Target/PowerPC/ lib/Target/X86/ test/CodeGen/X86/
...g in
> the next couple days.
>
> Details, since this has implications for vector machine backends?
It's basically as Chris said; there will be a ShuffleVectorSDNode,
and appropriate helper functions, node profile, and DAGCombiner support.
> I'm just not groking how moving isSplat to SDNode eliminates
> BUILD_VECTOR or deals with constant vector formation.
You can have a static method on SDNode that took an SDNode, checked if
it was a build vector, and calculated whatever splat information you
wanted. There's no need for BuildVectorSDNode for this particular...
2017 Mar 30
2
InstructionSimplify: adding a hook for shufflevector instructions
Thanks, Sanjay, that makes sense. The opportunity for improving instcombining splat sounds promising.
Another question about shuffle simplification. This is a testcase from test/Transforms/InstCombine/vec_shuffle.ll:
define <4 x i32> @test10(<4 x i32> %tmp5) nounwind {
%tmp6 = shufflevector <4 x i32> %tmp5, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32
2020 Feb 08
2
[RFC] Extending shufflevector for vscale vectors (SVE etc.)
> -----Original Message-----
> From: Chris Lattner <clattner at nondot.org>
> Sent: Friday, February 7, 2020 3:00 PM
> To: Eli Friedman <efriedma at quicinc.com>
> Cc: llvm-dev <llvm-dev at lists.llvm.org>
> Subject: [EXT] Re: [llvm-dev] [RFC] Extending shufflevector for vscale vectors
> (SVE etc.)
>
> > On Feb 7, 2020, at 12:39 PM, Eli Friedman