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Summary: TargetLoweringBase::Expand is defined as "Try to expand this to other ops, otherwise use a libcall." For ISD::UDIV and ISD::SDIV, the choice between the two possibilities was defined in a rather convoluted way: - if DIVREM is legal, expand to DIVREM - if DIVREM has a custom lowering, expand to DIVREM - if DIVREM libcall is defined and a remainder from the same division is computed elsewhere, expand to a DIVREM libcall - else, expand to a DIV libcall This had the undesirable effect that if both DIV and DIVREM are implemented as libcalls, then ISD::UDIV and ISD::SDIV are expanded to the heavier DIVREM libcall, even when the remainder isn't used. The new code adds a new LegalizeAction, TargetLoweringBase::LibCall, so that backends can directly control whether they prefer an expansion or a conversion to a libcall. This makes the generic lowering code even more generic, allowing its reuse in a wider range of target-specific configurations. The useful effect is that ARM backend will now generate a call to __aeabi_{i,u}div rather than __aeabi_{i,u}divmod in cases where it doesn't need the remainder. There's no functional change outside the ARM backend. Reviewers: t.p.northover, rengolin Subscribers: t.p.northover, llvm-commits, aemerson Differential Revision: http://reviews.llvm.org/D13862 llvm-svn: 250826 |
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ADT | ||
Analysis | ||
AsmParser | ||
Bitcode | ||
CodeGen | ||
Config | ||
DebugInfo | ||
ExecutionEngine | ||
IR | ||
IRReader | ||
LibDriver | ||
LineEditor | ||
Linker | ||
LTO | ||
MC | ||
Object | ||
Option | ||
Passes | ||
ProfileData | ||
Support | ||
TableGen | ||
Target | ||
Transforms | ||
CMakeLists.txt | ||
InitializePasses.h | ||
LinkAllIR.h | ||
LinkAllPasses.h | ||
module.modulemap | ||
module.modulemap.build | ||
Pass.h | ||
PassAnalysisSupport.h | ||
PassInfo.h | ||
PassRegistry.h | ||
PassSupport.h |