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Simon Pilgrim 1a2577191a [DAG][X86] Convert isNegatibleForFree/GetNegatedExpression to a target hook (PR42863) 
This patch converts the DAGCombine isNegatibleForFree/GetNegatedExpression into overridable TLI hooks and includes a demonstration X86 implementation.

The intention is to let us extend existing FNEG combines to work more generally with negatible float ops, allowing it work with target specific combines and opcodes (e.g. X86's FMA variants).

Unlike the SimplifyDemandedBits, we can't just handle target nodes through a Target callback, we need to do this as an override to allow targets to handle generic opcodes as well. This does mean that the target implementations has to duplicate some checks (recursion depth etc.).

I've only begun to replace X86's FNEG handling here, handling FMADDSUB/FMSUBADD negation and some low impact codegen changes (some FMA negatation propagation). We can build on this in future patches.

Differential Revision: https://reviews.llvm.org/D67557

llvm-svn: 372333
2019-09-19 15:02:47 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings Remove the obsolete BlockByRefStruct flag from LLVM IR 2019-09-18 22:38:56 +00:00
cmake [cmake] Changes to get Windows self-host working with PGO 2019-09-18 09:43:13 +00:00
docs [docs] Break long (>80) line. NFC 2019-09-19 14:19:32 +00:00
examples [Orc] Roll back ThreadPool to std::function 2019-09-13 11:59:51 +00:00
include [DAG][X86] Convert isNegatibleForFree/GetNegatedExpression to a target hook (PR42863) 2019-09-19 15:02:47 +00:00
lib [DAG][X86] Convert isNegatibleForFree/GetNegatedExpression to a target hook (PR42863) 2019-09-19 15:02:47 +00:00
projects [libc++] Take 2: Integrate the PSTL into libc++ 2019-08-05 18:29:14 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes Revert "Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds." 2019-09-11 00:43:35 +00:00
test [DAG][X86] Convert isNegatibleForFree/GetNegatedExpression to a target hook (PR42863) 2019-09-19 15:02:47 +00:00
tools Revert [llvm-ar] Include a line number when failing to parse an MRI script 2019-09-19 11:22:59 +00:00
unittests Add AutoUpgrade function to add new address space datalayout string to existing datalayouts. 2019-09-18 22:15:58 +00:00
utils [TableGen] Support encoding per-HwMode 2019-09-19 13:39:54 +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 Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt [cmake] Changes to get Windows self-host working with PGO 2019-09-18 09:43:13 +00:00
CODE_OWNERS.TXT Update email address in CODE_OWNERS 2019-07-01 16:01:15 +00:00
configure
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +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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