ac84005841
[CostModel][X86] Add vXi8 vector division by constants costs.
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ISD::MULHS/ISD::MULHU lowering of vXi8 types means we expand these in TargetLowering BuildSDIV/BuildUDIV.
llvm-svn: 345175
2018-10-24 18:44:12 +00:00
2cce074e8c
[CostModel][X86] Enable non-uniform vector division by constants costs.
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Non-uniform division/remainder handling was added back at D49248/D50765 - so share the 'mul+sub' costs that already exist for uniform cases.
llvm-svn: 345164
2018-10-24 17:30:29 +00:00
667a5b541f
[TargetTransformInfo] Add pow2 analysis for scalar constants
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Add ConstantInt analysis to getOperandInfo so we get more realistic div/rem expansion costs comparable to the vector costs.
llvm-svn: 336827
2018-07-11 17:51:27 +00:00
8c3765dc6b
[CostModel][X86] Add UDIV/UREM by pow2 costs
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Normally InstCombine would have simplified these to SRL/AND instructions but we may still see these during SLP vectorization etc.
llvm-svn: 336371
2018-07-05 16:56:28 +00:00
4162d77744
[TTI] Add uniform/non-uniform constant Pow2 detection to TargetTransformInfo::getInstructionThroughput
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This enables us to detect more fast path sdiv cases under cost analysis.
This patch also enables us to handle non-uniform-constant pow2 cases for X86 SDIV costs.
Found while working on D46276
Future patches can then extend the vectorizers to more fully support non-uniform pow2 cases.
Differential Revision: https://reviews.llvm.org/D46637
llvm-svn: 332969
2018-05-22 10:40:09 +00:00
fe5c5277ed
[CostModel][X86] Split off SLM checks
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A future patch will require this and the diff is much better if we perform the split separately.
llvm-svn: 331867
2018-05-09 11:42:34 +00:00
0ae4bba911
[CostModel][X86] Add div/rem tests for non-uniform constant divisors
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llvm-svn: 330852
2018-04-25 18:03:31 +00:00
8a15d72550
[CostModel][X86] Add SLM/GLM/BtVer2 compare + division/remainder cost tests
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llvm-svn: 330435
2018-04-20 14:50:34 +00:00
06fba8b204
[CostModel][X86] Regenerate integer division/remainder tests with update_analyze_test_checks.py
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llvm-svn: 329401
2018-04-06 15:23:26 +00:00
d3f0d03cc5
[X86][AVX1] Account for cost of extract/insert of 256-bit SDIV/UDIV by mul sequences
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llvm-svn: 303017
2017-05-14 18:52:15 +00:00
365be4f95c
[CostModel][X86] Fixed AVX1/AVX512 sdiv/udiv uniformconst costs for 256/512 bit integer vectors
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We weren't checking for uniform const costs before the general cost, resulting in very high estimates.
llvm-svn: 284755
2016-10-20 18:00:35 +00:00
1388c0acc1
[CostModel][X86] Added tests for sdiv/udiv costs for uniform const and uniform const power-of-2
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Shows poor costings in AVX1/AVX512BW for certain vector types
llvm-svn: 284748
2016-10-20 17:16:38 +00:00
025e26dd32
[CostModel][X86] Fixed AVX1/AVX512 sdiv/udiv general costs for 256/512 bit integer vectors
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We weren't accounting for legal types on every subtarget, meaning that many of the costs were using defaults.
We still don't correctly cost (or test) the 512-bit sdiv/udiv by uniform const cases, nor the power-of-2 cases.
llvm-svn: 284744
2016-10-20 16:39:11 +00:00
16cc616ebc
[CostModel][X86] Added tests for sdiv/udiv costs for scalar and 128/256/512 bit integer vectors
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Shows current bug in AVX1/AVX512BW costs for 256 bit vector types
llvm-svn: 284723
2016-10-20 12:34:00 +00:00
a04b9ef1e8
X86 cost model: Vectorizing integer division is a bad idea
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radar://14057959
llvm-svn: 184872
2013-06-25 19:14:09 +00:00
Simon Pilgrim