From 1941431f8a0f61fb5d5e3175cc49efd5dd19033c Mon Sep 17 00:00:00 2001 From: Juergen Ributzka Date: Sat, 21 Sep 2013 04:55:18 +0000 Subject: SelectionDAG: Teach the legalizer to split SETCC if VSELECT needs splitting too. The Type Legalizer recognizes that VSELECT needs to be split, because the type is to wide for the given target. The same does not always apply to SETCC, because less space is required to encode the result of a comparison. As a result VSELECT is split and SETCC is unrolled into scalar comparisons. This commit fixes the issue by checking for VSELECT-SETCC patterns in the DAG Combiner. If a matching pattern is found, then the result mask of SETCC is promoted to the expected vector mask for the given target. This mask has usually te same size as the VSELECT return type (except for Intel KNL). Now the type legalizer will split both VSELECT and SETCC. This allows the following X86 DAG Combine code to sucessfully detect the MIN/MAX pattern. This fixes PR16695, PR17002, and . git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191130 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86ISelLowering.cpp | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'lib/Target/X86') diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index b3cac05..974a1ee 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -1535,7 +1535,16 @@ void X86TargetLowering::resetOperationActions() { } EVT X86TargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const { - if (!VT.isVector()) return MVT::i8; + if (!VT.isVector()) + return MVT::i8; + + const TargetMachine &TM = getTargetMachine(); + if (!TM.Options.UseSoftFloat && Subtarget->hasAVX512()) + switch(VT.getVectorNumElements()) { + case 8: return MVT::v8i1; + case 16: return MVT::v16i1; + } + return VT.changeVectorElementTypeToInteger(); } -- cgit v1.1