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Mirror of https://github.com/RPCS3/llvm-mirror
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Chris Lattner 7dfeebafe5 [Support/Parallel] Add a special case for 0/1 items to llvm::parallel_for_each. 
This avoids the non-trivial overhead of creating a TaskGroup in these degenerate
cases, but also exposes parallelism.  It turns out that the default executor
underlying TaskGroup prevents recursive parallelism - so an instance of a task
group being alive will make nested ones become serial.

This is a big issue in MLIR in some dialects, if they have a single instance of
an outer op (e.g. a firrtl.circuit) that has many parallel ops within it (e.g.
a firrtl.module).  This patch side-steps the problem by avoiding creating the
TaskGroup in the unneeded case.  See this issue for more details:
https://github.com/llvm/circt/issues/993

Note that this isn't a really great solution for the general case of nested
parallelism.  A redesign of the TaskGroup stuff would be better, but would be
a much more invasive change.

Differential Revision: https://reviews.llvm.org/D101699
2021-05-03 10:08:00 -07:00
benchmarks
bindings [NFC][OCaml] Reformat to clean up following CAMLprim removal 2021-04-05 10:55:08 +01:00
cmake [cmake] Use -ffunction-sections and -Wl,--gc-sections on MinGW targets 2021-04-30 10:53:40 +03:00
docs [doc] typo fixes 2021-05-03 10:59:51 +02:00
examples [Orc][examples] Add missing FileCheck for lit test and polish output 2021-04-07 11:12:20 +02:00
include [Support/Parallel] Add a special case for 0/1 items to llvm::parallel_for_each. 2021-05-03 10:08:00 -07:00
lib [AArch64] Fold CSEL x, x, cc -> x 2021-05-03 17:34:05 +01:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [runtimes] Add the libc project to the list of runtimes. 2021-03-23 17:33:03 +00:00
test [AArch64] Fold CSEL x, x, cc -> x 2021-05-03 17:34:05 +01:00
tools Reland "AMDGPU/llvm-readobj: Add missing tests for note parsing/displaying" 2021-05-02 22:56:17 -04:00
unittests [ADT] Add llvm::remove_cvref and llvm::remove_cvref_t 2021-04-30 18:22:38 +00:00
utils Partial revert of "Use std::foo_t rather than std::foo in LLVM." in googlebench 2021-05-03 07:49:30 -07:00
.clang-format
.clang-tidy
.gitattributes
.gitignore Remove .gitignore entries not relevant in the monorepo. 2021-04-07 12:25:02 -07:00
CMakeLists.txt [cmake] Configure policy CMP0116 2021-04-23 08:57:40 -07:00
CODE_OWNERS.TXT [M68k][CODE_OWNERS](0/8) Add code owner for the M68k target 2021-03-08 12:30:56 -08:00
configure
CREDITS.TXT Update personal info in CREDITS.TXT 2021-04-11 19:25:02 +08:00
LICENSE.TXT
llvm.spec.in
README.txt
RELEASE_TESTERS.TXT

README.txt 

The LLVM Compiler Infrastructure
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