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[PowerPC] Fix and improve vector comparisons

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This patch refactors code generation of vector comparisons.

This fixes a wrong code-gen bug for ISD::SETGE for floating-point types,
and improves generated code for vector comparisons in general.

Specifically, the patch moves all logic deciding how to implement vector
comparisons into getVCmpInst, which gets two extra boolean outputs
indicating to its caller whether its needs to swap the input operands
and/or negate the result of the comparison.  Apart from implementing
these two modifications as directed by getVCmpInst, there is no need
to ever implement vector comparisons in any other manner; in particular,
there is never a need to perform two separate comparisons (e.g. one for
equal and one for greater-than, as code used to do before this patch).

Reviewed by Bill Schmidt.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2014-08-04 13:13:57 +00:00
parent 98b419bff7
commit 3b7a193521
3 changed files with 179 additions and 188 deletions
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10
lib/Target/PowerPC/PPCISelLowering.cpp
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@@ -526,11 +526,6 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
// Altivec does not contain unordered floating-point compare instructions
setCondCodeAction(ISD::SETUO, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUGT, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUGE, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETULT, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETULE, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETO, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETONE, MVT::v4f32, Expand);
@@ -561,11 +556,6 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
// Share the Altivec comparison restrictions.
setCondCodeAction(ISD::SETUO, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETUGT, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETUGE, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETULT, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETULE, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETO, MVT::v2f64, Expand);
setCondCodeAction(ISD::SETONE, MVT::v2f64, Expand);