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[Codegen] Add intrinsics 'absdiff' and corresponding SDNodes for absolute difference operation

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This adds new intrinsics "*absdiff" for absolute difference ops to facilitate efficient code generation for "sum of absolute differences" operation.
The patch also contains the introduction of corresponding SDNodes and basic legalization support.Sanity of the generated code is tested on X86.

This is 1st of the three patches.

Patch by Shahid Asghar-ahmad!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242409 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2015-07-16 15:22:46 +00:00
parent e0117a90cf
commit acd275a629
11 changed files with 363 additions and 0 deletions
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2
lib/CodeGen/TargetLoweringBase.cpp
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@@ -827,6 +827,8 @@ void TargetLoweringBase::initActions() {
setOperationAction(ISD::USUBO, VT, Expand);
setOperationAction(ISD::SMULO, VT, Expand);
setOperationAction(ISD::UMULO, VT, Expand);
setOperationAction(ISD::UABSDIFF, VT, Expand);
setOperationAction(ISD::SABSDIFF, VT, Expand);
// These library functions default to expand.
setOperationAction(ISD::FROUND, VT, Expand);