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Author SHA1 Message Date
Eric Christopher 93dfb93ad6 Temporarily Revert "[SLP] Recommit: Look-ahead operand reordering heuristic." 
As there are some reported miscompiles with AVX512 and performance regressions
in Eigen. Verified with the original committer and testcases will be forthcoming.

This reverts commit r364964.

llvm-svn: 366154
 2019-07-15 23:36:02 +00:00
Vasileios Porpodas cf47ff5ffb [SLP] Recommit: Look-ahead operand reordering heuristic. 
Summary: This patch introduces a new heuristic for guiding operand reordering. The new "look-ahead" heuristic can look beyond the immediate predecessors. This helps break ties when the immediate predecessors have identical opcodes (see lit test for an example).

Reviewers: RKSimon, ABataev, dtemirbulatov, Ayal, hfinkel, rnk

Reviewed By: RKSimon, dtemirbulatov

Subscribers: hiraditya, phosek, rnk, rcorcs, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60897

llvm-svn: 364964
 2019-07-02 20:20:28 +00:00
Jordan Rupprecht a7972dc04a Revert [SLP] Look-ahead operand reordering heuristic. 
This reverts r364478 (git commit 574cb0eb3a)

The patch is causing compilation timeouts.

llvm-svn: 364846
 2019-07-01 21:10:43 +00:00
Vasileios Porpodas 574cb0eb3a [SLP] Look-ahead operand reordering heuristic. 
Summary: This patch introduces a new heuristic for guiding operand reordering. The new "look-ahead" heuristic can look beyond the immediate predecessors. This helps break ties when the immediate predecessors have identical opcodes (see lit test for an example).

Reviewers: RKSimon, ABataev, dtemirbulatov, Ayal, hfinkel, rnk

Reviewed By: RKSimon, dtemirbulatov

Subscribers: rnk, rcorcs, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60897

llvm-svn: 364478
 2019-06-26 21:25:24 +00:00
Reid Kleckner 592a193285 Revert [SLP] Look-ahead operand reordering heuristic. 
This reverts r364084 (git commit 5698921be2)

It caused crashes while compiling a file in Chrome. Reduction
forthcoming.

llvm-svn: 364111
 2019-06-21 23:10:25 +00:00
Simon Pilgrim 5698921be2 [SLP] Look-ahead operand reordering heuristic. 
This patch introduces a new heuristic for guiding operand reordering. The new "look-ahead" heuristic can look beyond the immediate predecessors. This helps break ties when the immediate predecessors have identical opcodes (see lit test for an example).

Committed on behalf of @vporpo (Vasileios Porpodas)

Differential Revision: https://reviews.llvm.org/D60897

llvm-svn: 364084
 2019-06-21 17:57:01 +00:00
Simon Pilgrim 72186a2494 [SLP][X86] Add lookahead reordering tests from D60897 
llvm-svn: 363925
 2019-06-20 12:52:58 +00:00
Simon Pilgrim 83098d28a1 [SLP] Lit test that cannot get vectorized due to lack of look-ahead operand reordering heuristic. 
The code in this test is not vectorized by SLP because its operand reordering cannot look beyond the immediate predecessors.
This will get fixed in a follow-up patch that introduces the look-ahead operand reordering heuristic.

Committed on behalf of @vporpo (Vasileios Porpodas)

Differential Revision: https://reviews.llvm.org/D61283

llvm-svn: 359553
 2019-04-30 11:03:09 +00:00