b7538c71e1
load and store reference same memory location, the memory location is represented by getelementptr with two uses (load and store) and the getelementptr's base is alloca with single use. At this point, instructions from alloca to store can be removed. (this pattern is generated when bitfield is accessed.) For example, %u = alloca %struct.test, align 4 ; [#uses=1] %0 = getelementptr inbounds %struct.test* %u, i32 0, i32 0;[#uses=2] %1 = load i8* %0, align 4 ; [#uses=1] %2 = and i8 %1, -16 ; [#uses=1] %3 = or i8 %2, 5 ; [#uses=1] store i8 %3, i8* %0, align 4 llvm-svn: 127565 |
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| bindings | ||
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| docs | ||
| examples | ||
| include | ||
| lib | ||
| projects | ||
| runtime | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| website | ||
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| CMakeLists.txt | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| Makefile | ||
| Makefile.common | ||
| Makefile.config.in | ||
| Makefile.rules | ||
| ModuleInfo.txt | ||
| README.txt | ||
| build-for-llvm-top.sh | ||
| configure | ||
| llvm.spec.in | ||
README.txt
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, 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 HTML documentation provided in docs/index.html for further assistance with LLVM. If you're writing a package for LLVM, see docs/Packaging.html for our suggestions.