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7 Commits

Author SHA1 Message Date
Matt Arsenault
bb366db643 AMDGPU: Cost model for basic integer operations 
This resolves bug 21148 by preventing promotion to
i64 induction variables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264376 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-03-25 01:16:40 +00:00
Matt Arsenault
359a7d918e AMDGPU: Partially implement getArithmeticInstrCost for FP ops 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264374 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-03-25 01:00:32 +00:00
Matt Arsenault
e4e369ab90 TTI: Report 0 cost for free addrspacecasts 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264369 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-03-25 00:26:29 +00:00
Matt Arsenault
93e0b28a0e TTI: Use 0 for cost of fabs if free 
Ideally this would also happen for fneg, but that
isn't a distinct operation in the IR.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264368 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-03-25 00:26:22 +00:00
Matt Arsenault
42792ff39d AMDGPU: TTI: Make insertelement free. 
We don't want to have a cost to scalarizing operations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264364 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-03-25 00:14:11 +00:00
Matt Arsenault
b11dd50509 AMDGPU: Override getCFInstrCost 
The default cost was 0 with the assumption that it is predictable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255796 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-12-16 18:37:19 +00:00
Matt Arsenault
2320de6adb AMDGPU: Report extractelement as free in cost model 
The cost for scalarized operations is computed as N * (scalar operation
cost + 1 extractelement + 1 insertelement). This partially fixes
inflating the cost of scalarized operations since every operation is
scalarized and free. I don't think we want any cost asociated with
scalarization, but for now insertelement is still counted. I'm not sure
if we should pretend that insertelement is also free, or add a way
to compute a custom scalarization cost.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254438 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-12-01 19:08:39 +00:00