llvm-project.git/llvm/lib/CodeGen/BreakFalseDeps.cpp, branch users/nico/python-2 Unnamed repository; edit this file 'description' to name the repository. [X86][BreakFalseDeps] Using reverse order for undef register selection (#137569) 2025-06-11T14:08:20+00:00 Phoebe Wang phoebe.wang@intel.com 2025-06-11T14:08:20+00:00 76e14deb4a6967388a9bf84db2feeac17a30c786 BreakFalseDeps picks the best register for undef operands if instructions have false dependency. The problem is if the instruction is close to the beginning of the function, ReachingDefAnalysis is over optimism to the unused registers, which results in collision with registers just defined in the caller. This patch changes the selection of undef register in an reverse order, which reduces the probability of register collisions between caller and callee. It brings improvement in some of our internal benchmarks with negligible effect on other benchmarks. 
BreakFalseDeps picks the best register for undef operands if
instructions have false dependency. The problem is if the instruction is
close to the beginning of the function, ReachingDefAnalysis is over
optimism to the unused registers, which results in collision with
registers just defined in the caller.

This patch changes the selection of undef register in an reverse order,
which reduces the probability of register collisions between caller and
callee. It brings improvement in some of our internal benchmarks with
negligible effect on other benchmarks.
 [LLVM][CodeGen] Add convenience accessors for MachineFunctionProperties (#140002) 2025-05-22T15:07:52+00:00 Rahul Joshi rjoshi@nvidia.com 2025-05-22T15:07:52+00:00 1fdf02ad5a4ca155017eea22688365a20aab077c Add per-property has<Prop>/set<Prop>/reset<Prop> functions to MachineFunctionProperties. 
Add per-property has<Prop>/set<Prop>/reset<Prop> functions to
MachineFunctionProperties.
 [MC] Add MCRegisterInfo::regunits for iteration over register units 2023-06-16T02:39:50+00:00 Sergei Barannikov barannikov88@gmail.com 2023-05-21T01:28:33+00:00 aa2d0fbc30d948dc9ce7d312ae4c56467fa57932 Reviewed By: foad Differential Revision: https://reviews.llvm.org/D152098 
Reviewed By: foad

Differential Revision: https://reviews.llvm.org/D152098
[CodeGen] Make use of MachineInstr::all_defs and all_uses. NFCI. 2023-06-01T18:17:34+00:00 Jay Foad jay.foad@amd.com 2023-05-24T13:57:23+00:00 5022fc2ad31b5e3211e2458347c89412b8c5ec1b Differential Revision: https://reviews.llvm.org/D151424 
Differential Revision: https://reviews.llvm.org/D151424
[BreakFalseDeps] Respect dead blocks. 2023-04-21T05:17:04+00:00 Serguei Katkov serguei.katkov@azul.com 2023-04-14T07:05:03+00:00 aa5cc39b6df0c35ff48cb9d1a397cb8fe1ba00ee The pass uses ReachingDefAnalysis which has no information about instructions in dead blocks. So do not process them. Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D148329 
The pass uses ReachingDefAnalysis which has no information about
instructions in dead blocks.
So do not process them.

Reviewed By: pengfei
Differential Revision: https://reviews.llvm.org/D148329
Fix uninitialized pointer members in CodeGen 2023-04-17T08:32:46+00:00 Akshay Khadse akshayskhadse@gmail.com 2023-04-17T08:16:23+00:00 8bf7f86d7966ff835967669fb6bf23897e20b71d This change initializes the members TSI, LI, DT, PSI, and ORE pointer feilds of the SelectOptimize class to nullptr. Reviewed By: LuoYuanke Differential Revision: https://reviews.llvm.org/D148303 
This change initializes the members TSI, LI, DT, PSI, and ORE pointer feilds of the SelectOptimize class to nullptr.

Reviewed By: LuoYuanke

Differential Revision: https://reviews.llvm.org/D148303
[NFC] Add checks for potential null returns 2022-12-13T14:30:31+00:00 Phoebe Wang phoebe.wang@intel.com 2022-12-13T14:28:47+00:00 7168e501e4ee9cafecdcfd7c7216909f4609f88a 






Cleanup includes: final pass
2022-03-29T07:00:21+00:00

serge-sans-paille
sguelton@redhat.com

2022-03-28T12:10:26+00:00

01be9be2f2c0d56b2edc1505922dd9c202cbe014

Cleanup a few extra files, this closes the work on libLLVM dependencies on my
side.

Impact on libLLVM preprocessed output: -35876 lines

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D122576





Cleanup a few extra files, this closes the work on libLLVM dependencies on my
side.

Impact on libLLVM preprocessed output: -35876 lines

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D122576







Cleanup codegen includes
2022-03-16T07:43:00+00:00

serge-sans-paille
sguelton@redhat.com

2022-03-15T09:54:19+00:00

989f1c72e0f4236ac35a35cc9998ea34bc62d5cd

This is a (fixed) recommit of https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D121681





This is a (fixed) recommit of https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D121681







Revert "Cleanup codegen includes"
2022-03-10T12:59:22+00:00

Nico Weber
thakis@chromium.org

2022-03-10T12:54:41+00:00

a278250b0f85949d4f98e641786e5eb2b540c6b0

This reverts commit 7f230feeeac8a67b335f52bd2e900a05c6098f20.
Breaks CodeGenCUDA/link-device-bitcode.cu in check-clang,
and many LLVM tests, see comments on https://reviews.llvm.org/D121169





This reverts commit 7f230feeeac8a67b335f52bd2e900a05c6098f20.
Breaks CodeGenCUDA/link-device-bitcode.cu in check-clang,
and many LLVM tests, see comments on https://reviews.llvm.org/D121169