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Alex Bradbury f2b04fe6b7 [RISCV] Optimize emission of SELECT sequences
This patch optimizes the emission of a sequence of SELECTs with the same
condition, avoiding the insertion of unnecessary control flow. Such a sequence
often occurs when a SELECT of values wider than XLEN is legalized into two
SELECTs with legal types. We have identified several use cases where the
SELECTs could be interleaved with other instructions. Therefore, we extend the
sequence to include non-SELECT instructions if we are able to detect that the
non-SELECT instructions do not impact the optimization.

This patch supersedes https://reviews.llvm.org/D59096, which attempted to
address this issue by introducing a new SelectionDAG node. Hat tip to Eli
Friedman for his feedback on how to best handle this issue.

Differential Revision: https://reviews.llvm.org/D59355
Patch by Luís Marques.

llvm-svn: 356741
2019-03-22 10:45:03 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [bindings/go] Fix building on 32-bit systems (ARM etc.) 2019-02-16 22:33:10 +00:00
cmake Remove HAVE_REALPATH from config.h 2019-03-20 17:26:11 +00:00
docs [DebugInfo] Introduce DW_OP_LLVM_convert 2019-03-19 13:16:28 +00:00
examples [Kaleidoscope] Fix symbol resolver to search in reverse order. 2019-02-21 16:53:04 +00:00
include [DWARF] Refactor RelocVisitor and fix computation of SHT_RELA-typed relocation entries 2019-03-22 02:43:11 +00:00
lib [RISCV] Optimize emission of SELECT sequences 2019-03-22 10:45:03 +00:00
projects Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
resources
runtimes [runtime] Use --strip-all rather than --strip-sections 2019-03-10 04:26:54 +00:00
test [RISCV] Optimize emission of SELECT sequences 2019-03-22 10:45:03 +00:00
tools [llvm-objcopy] - Implement replaceSectionReferences for GroupSection class. 2019-03-22 10:24:37 +00:00
unittests [AArch64] Update for Exynos 2019-03-21 18:54:58 +00:00
utils Remove HAVE_REALPATH from config.h 2019-03-20 17:26:11 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore [clangd] Store index in '.clangd/index' instead of '.clangd-index' 2019-02-20 19:08:06 +00:00
CMakeLists.txt Use response file when generating LLVM-C.dll 2019-03-19 09:14:09 +00:00
CODE_OWNERS.TXT [llvm-mca] Move llvm-mca library to llvm/lib/MCA. 2018-12-17 08:08:31 +00:00
configure
CREDITS.TXT [NFC] Add to contributor list. 2019-02-26 05:46:45 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
README.txt Testing commit access 2019-02-19 20:38:51 +00:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

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