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| author | James Molloy <james.molloy@arm.com> | 2015-11-12 12:29:09 +0000 |
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| committer | James Molloy <james.molloy@arm.com> | 2015-11-12 12:29:09 +0000 |
| commit | 90111f79f9f34e0ba488c1453e2e3b57db2553e7 (patch) | |
| tree | 2682353f0cf3fcf013ede40e10929cc5010dddd4 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | 110094017ce85435ab55207efdb4aab4ad95a16d (diff) | |
| download | bcm5719-llvm-90111f79f9f34e0ba488c1453e2e3b57db2553e7.tar.gz bcm5719-llvm-90111f79f9f34e0ba488c1453e2e3b57db2553e7.zip | |
[SDAG] Introduce a new BITREVERSE node along with a corresponding LLVM intrinsic
Several backends have instructions to reverse the order of bits in an integer. Conceptually matching such patterns is similar to @llvm.bswap, and it was mentioned in http://reviews.llvm.org/D14234 that it would be best if these patterns were matched in InstCombine instead of reimplemented in every different target.
This patch introduces an intrinsic @llvm.bitreverse.i* that operates similarly to @llvm.bswap. For plumbing purposes there is also a new ISD node ISD::BITREVERSE, with simple expansion and promotion support.
The intention is that InstCombine's BSWAP detection logic will be extended to support BITREVERSE too, and @llvm.bitreverse intrinsics emitted (if the backend supports lowering it efficiently).
llvm-svn: 252878
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions
