[LLVMdev] Extracting a splat value from vector instruction. (original) (raw)
Hal Finkel hfinkel at anl.gov
Thu Jul 9 17:23:12 PDT 2015
- Previous message: [LLVMdev] Extracting a splat value from vector instruction.
- Next message: [LLVMdev] Extracting a splat value from vector instruction.
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
----- Original Message -----
From: "Elena Demikhovsky" <elena.demikhovsky at intel.com> To: llvmdev at cs.uiuc.edu Sent: Thursday, July 9, 2015 7:10:48 AM Subject: [LLVMdev] Extracting a splat value from vector instruction.
Hi, We have a function in IRBuilder.h Value *CreateVectorSplat( unsigned NumElts , Value * V , const Twine & Name = "" ) { .. } This function creates 2 instructions - “insertelement” and “shuffle” with all-zero mask. Now I want to add Value *getSplatValue(Value *Val). This function will try to recognize the pattern - insertelement+shuffle and return the splat value (or nullptr). I suppose, this interface should be useful. Do you agree with me? If yes, where should I put it? May it be I can define a new class VectorInst and put this interface there?
It does sound useful, but I think you might as well put it in include/llvm/Analysis/VectorUtils.h as a static helper function. I don't think we need a new artificial subclass just for this functionality.
-Hal
Thank you.
* Elena
--------------------------------------------------------------------- Intel Israel (74) Limited This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
LLVM Developers mailing list LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
-- Hal Finkel Assistant Computational Scientist Leadership Computing Facility Argonne National Laboratory
- Previous message: [LLVMdev] Extracting a splat value from vector instruction.
- Next message: [LLVMdev] Extracting a splat value from vector instruction.
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]