Commit Graph

16 Commits

Author SHA1 Message Date
Simon Pilgrim d54bae6525 [X86][SSE] Add support for VZEXT constant folding
llvm-svn: 265646
2016-04-07 07:52:45 +00:00
Simon Pilgrim 035b19ecf5 [X86][SSE41] Avoid variable blend for constant v8i16 shifts
The SSE41 v8i16 shift lowering using (v)pblendvb is great for non-constant shift amounts, but if it is constant then we can efficiently reduce the VSELECT to shuffles with the pre-SSE41 lowering.

llvm-svn: 263383
2016-03-13 18:35:59 +00:00
Simon Pilgrim a09a154c2e [X86][SSE] Regenerate vector shift tests
llvm-svn: 259999
2016-02-06 17:57:15 +00:00
Simon Pilgrim 5ba1c127fc [X86][SSE] Improve i16 splatting shuffles
Better handling of the annoying pshuflw/pshufhw ops which only shuffle lower/upper halves of a vector.

Added vXi16 unary shuffle support for cases where i16 elements (from the same half of the source) are being splatted to the whole of one of the halves. This avoids the general lowering case which must shuffle the 32-bit elements first - meaning that we used to end up with unnecessary duplicate pshuflw/pshufhw shuffles.

Note this has the side effect of a lot of SSSE3 test cases no longer needing to use PSHUFB, as it falls below the 3 op combine threshold for when PSHUFB is typically worth it. I've raised PR26183 to discuss if the threshold should be changed and whether we need to make it more specific to the target CPU.

Differential Revision: http://reviews.llvm.org/D14901

llvm-svn: 258440
2016-01-21 22:07:41 +00:00
Igor Breger 7b46b4e798 AVX512BW: Enable packed word shift for 512bit vector. Enable lowering scalar immidiate shift v64i8 .Fix predicate for AVX1/2 shifts.
Differential Revision: http://reviews.llvm.org/D15713

llvm-svn: 256324
2015-12-23 08:06:50 +00:00
James Y Knight 7c905063c5 Make utils/update_llc_test_checks.py note that the assertions are
autogenerated.

Also update existing test cases which appear to be generated by it and
weren't modified (other than addition of the header) by rerunning it.

llvm-svn: 253917
2015-11-23 21:33:58 +00:00
Simon Pilgrim b398da1d5c [X86][SSE] shift/rotate tests - remove unnecessary mcpu arguments and regenerate/cleanup
llvm-svn: 251232
2015-10-25 12:07:45 +00:00
Simon Pilgrim 3d11c994f7 [X86][XOP] Added support for the lowering of 128-bit vector shifts to XOP shift instructions
The XOP shifts just have logical/arithmetic versions and the left/right shifts are controlled by whether the value is positive/negative. Because of this I've added new X86ISD nodes instead of trying to force them to use the existing shift nodes.

Additionally Excavator cores (bdver4) support XOP and AVX2 - meaning that it should use the AVX2 shifts when it can and fall back to XOP in other cases.

Differential Revision: http://reviews.llvm.org/D8690

llvm-svn: 248878
2015-09-30 08:17:50 +00:00
Simon Pilgrim ba10f76705 [X86][SSE] Keep 32-bit target i64 vector shifts on SSE unit.
This patch improves the 32-bit target i64 constant matching to detect the shuffle vector splats that are introduced by i64 vector shift vectorization (D8416).

Differential Revision: http://reviews.llvm.org/D11327

llvm-svn: 243577
2015-07-29 21:44:27 +00:00
Simon Pilgrim 86478c6909 [X86][SSE] Vectorize i64 ASHR operations
This patch vectorizes the v2i64/v4i64 ASHR shift operations - the last remaining integer vector shifts that are still being transferred to/from the scalar unit to be completed.

Differential Revision: http://reviews.llvm.org/D11439

llvm-svn: 243569
2015-07-29 20:31:45 +00:00
Simon Pilgrim 769d58f9df [X86][SSE] Added nounwind attribute to vector shift tests.
Stop i686 codegen from generating cfi directives.

llvm-svn: 242443
2015-07-16 21:14:26 +00:00
Simon Pilgrim 4582ca5ecb [X86][SSE] Added i686/SSE2 vector shift tests.
We were only testing on x86-64, but we should be ensuring decent code gen of i64 shifts on 32-bit targets.

llvm-svn: 242273
2015-07-15 08:04:07 +00:00
Simon Pilgrim 64cc4ad0a2 [X86][SSE] Vectorized v4i32 non-uniform shifts.
While the v4i32 shl operation is already vectorized using a cvttps2dq/pmulld pattern, the lshr/ashr opeations are still scalarized.

This patch adds vectorization support for non-uniform v4i32 shift operations - it splats constant shift amounts to allow them to use the immediate sse shift instructions, or extracts/zero-extends non-constant shift amounts. The individual results are then blended together.

Differential Revision: http://reviews.llvm.org/D11063

llvm-svn: 241989
2015-07-12 11:15:19 +00:00
Simon Pilgrim d865503b59 [X86][SSE] Vector shift test cleanup. NFC.
llvm-svn: 241730
2015-07-08 21:11:17 +00:00
Simon Pilgrim 8fbf1c1f4a [X86][SSE] Vectorized i64 uniform constant SRA shifts
This patch adds vectorization support for uniform constant i64 arithmetic shift right operators.

Differential Revision: http://reviews.llvm.org/D9645

llvm-svn: 241514
2015-07-06 22:35:19 +00:00
Simon Pilgrim a0d5c5924a [X86][SSE] Added full set of 128-bit vector shift tests.
Removed some old duplicate tests.

llvm-svn: 240465
2015-06-23 21:18:15 +00:00