From 78fd46b230541ee00f95448ec281855bd54c0e68 Mon Sep 17 00:00:00 2001 From: Matthew Simpson Date: Tue, 9 May 2017 20:18:12 +0000 Subject: [AArch64] Consider widening instructions in cost calculations The AArch64 instruction set has a few "widening" instructions (e.g., uaddl, saddl, uaddw, etc.) that take one or more doubleword operands and produce quadword results. The operands are automatically sign- or zero-extended as appropriate. However, in LLVM IR, these extends are explicit. This patch updates TTI to consider these widening instructions as single operations whose cost is attached to the arithmetic instruction. It marks extends that are part of a widening operation "free" and applies a sub-target specified overhead (zero by default) to the arithmetic instructions. Differential Revision: https://reviews.llvm.org/D32706 llvm-svn: 302582 --- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp') diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp index 99084444bdd..960019f41df 100644 --- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -1819,11 +1819,13 @@ int BoUpSLP::getEntryCost(TreeEntry *E) { CInt->getValue().isPowerOf2()) Op2VP = TargetTransformInfo::OP_PowerOf2; - int ScalarCost = VecTy->getNumElements() * - TTI->getArithmeticInstrCost(Opcode, ScalarTy, Op1VK, - Op2VK, Op1VP, Op2VP); + SmallVector Operands(VL0->operand_values()); + int ScalarCost = + VecTy->getNumElements() * + TTI->getArithmeticInstrCost(Opcode, ScalarTy, Op1VK, Op2VK, Op1VP, + Op2VP, Operands); int VecCost = TTI->getArithmeticInstrCost(Opcode, VecTy, Op1VK, Op2VK, - Op1VP, Op2VP); + Op1VP, Op2VP, Operands); return VecCost - ScalarCost; } case Instruction::GetElementPtr: { -- cgit v1.2.3