Elena Demikhovsky
ea4d3808e5
Optimized integer vector multiplication operation by replacing it with shift/xor/sub when it is possible. Fixed a bug in SDIV, where the const operand is not a splat constant vector.
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llvm-svn: 184931
2013-06-26 10:55:03 +00:00
Benjamin Kramer
d2f85ae895
X86: Fold EXTRACT_SUBVECTORs of a BUILD_VECTOR into a smaller BUILD_VECTOR.
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That can usually be lowered efficiently and is common in sandybridge code.
It would be nice to do this in DAGCombiner but we can't insert arbitrary
BUILD_VECTORs this late.
Fixes PR15462.
llvm-svn: 176634
2013-03-07 18:48:40 +00:00
Benjamin Kramer
ae05ca2d32
X86: Open up some opportunities for constant folding by postponing shift lowering.
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Fixes PR15141.
llvm-svn: 174327
2013-02-04 15:19:33 +00:00
Craig Topper
62ae335144
Make LowerSIGN_EXTEND_INREG split 256-bit vectors when AVX1 is enabled and use AVX2 shifts when AVX2 is enabled.
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llvm-svn: 145022
2011-11-21 01:12:36 +00:00
Craig Topper
0458cdf64a
Add more AVX2 shift lowering support. Move AVX2 variable shift to use patterns instead of custom lowering code.
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llvm-svn: 144457
2011-11-12 09:58:49 +00:00
Bruno Cardoso Lopes
82795e6b41
Fix PR10688. Add support for spliting 256-bit vector shifts when the
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shift amount is variable
llvm-svn: 137885
2011-08-17 22:12:20 +00:00
Bruno Cardoso Lopes
d8534855ff
Add support for several vector shifts operations while in AVX mode. Fix PR10581
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llvm-svn: 137067
2011-08-08 21:31:08 +00:00
