bfee5a9b42
https://bugs.llvm.org/show_bug.cgi?id=38949 It's not clear to me that we even need a one-use check in this fold. Ie, 2 independent loads might be better than a load+dependent shuffle. Note that the existing re-use tests are not affected. We actually do form a broadcast node in those tests now because there's no extra use of the insert_subvector node in those cases. But something later in isel pattern matching decides that it is not worth using a broadcast for the full load in those tests: Legalized selection DAG: %bb.0 'test_broadcast_2f64_4f64_reuse:' t7: v2f64,ch = load<(load 16 from %ir.p0)> t0, t2, undef:i64 t4: i64,ch = CopyFromReg t0, Register:i64 %1 t10: ch = store<(store 16 into %ir.p1)> t7:1, t7, t4, undef:i64 t18: v4f64 = insert_subvector undef:v4f64, t7, Constant:i64<0> t20: v4f64 = insert_subvector t18, t7, Constant:i64<2> Becomes: t7: v2f64,ch = load<(load 16 from %ir.p0)> t0, t2, undef:i64 t4: i64,ch = CopyFromReg t0, Register:i64 %1 t10: ch = store<(store 16 into %ir.p1)> t7:1, t7, t4, undef:i64 t21: v4f64 = X86ISD::SUBV_BROADCAST t7 ISEL: Starting selection on root node: t21: v4f64 = X86ISD::SUBV_BROADCAST t7 ... Created node: t27: v4f64 = INSERT_SUBREG IMPLICIT_DEF:v4f64, t7, TargetConstant:i32<7> Morphed node: t21: v4f64 = VINSERTF128rr t27, t7, TargetConstant:i8<1> llvm-svn: 342347 |
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| include | ||
| lib | ||
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| runtimes | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
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| CODE_OWNERS.TXT | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
| configure | ||
| llvm.spec.in | ||
README.txt
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.