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This pass implements whole program optimization of virtual calls in cases where we know (via bitset information) that the list of callees is fixed. This includes the following: - Single implementation devirtualization: if a virtual call has a single possible callee, replace all calls with a direct call to that callee. - Virtual constant propagation: if the virtual function's return type is an integer <=64 bits and all possible callees are readnone, for each class and each list of constant arguments: evaluate the function, store the return value alongside the virtual table, and rewrite each virtual call as a load from the virtual table. - Uniform return value optimization: if the conditions for virtual constant propagation hold and each function returns the same constant value, replace each virtual call with that constant. - Unique return value optimization for i1 return values: if the conditions for virtual constant propagation hold and a single vtable's function returns 0, or a single vtable's function returns 1, replace each virtual call with a comparison of the vptr against that vtable's address. Differential Revision: http://reviews.llvm.org/D16795 llvm-svn: 260312 |
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| .. | ||
| bad-read-from-vtable.ll | ||
| constant-arg.ll | ||
| devirt-single-impl.ll | ||
| non-array-vtable.ll | ||
| non-constant-vtable.ll | ||
| uniform-retval-invoke.ll | ||
| uniform-retval.ll | ||
| unique-retval.ll | ||
| vcp-accesses-memory.ll | ||
| vcp-no-this.ll | ||
| vcp-non-constant-arg.ll | ||
| vcp-too-wide-ints.ll | ||
| vcp-type-mismatch.ll | ||
| vcp-uses-this.ll | ||
| virtual-const-prop-begin.ll | ||
| virtual-const-prop-end.ll | ||