forked from OSchip/llvm-project
25aebe2ccf
While `%x.curr` is always safe to compute, because `LoopBackedgeTakenCount` will always be smaller than `bitwidth(X)`, i.e. we never get poison, rewriting `%x.next` is more complicated, however, because `X << LoopTripCount` will be poison iff `LoopTripCount == bitwidth(X)` (which will happen iff `BitPos` is `bitwidth(x) - 1` and `X` is `1`). So unless we know that isn't the case (as alive2 notes, we know it's safe to do iff shift had no-wrap flags, or bitpos does not indicate signbit, or we know that %x is never `1`), we'll need to emit an alternative, safe IR, by either just shifting the `%x.curr`, or conditionally selecting between the computed `%x.next` and `0`.. Former IR looks better so let's do that. While there, ensure that we don't drop no-wrap flags from said shift. |
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| include | ||
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| runtimes | ||
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| .clang-format | ||
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| .gitattributes | ||
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| CODE_OWNERS.TXT | ||
| CREDITS.TXT | ||
| LICENSE.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.