forked from OSchip/llvm-project
8bde5e58c0
The delayed stack protector feature which is currently used for SDAG (and thus allows for more commonly generating tail calls) depends on being able to extract the tail call into a separate return block. To do this it also has to extract the vreg->physreg copies that set up the call's arguments, since if it doesn't then the call inst ends up using undefined physregs in it's new spliced block. SelectionDAG implementations can do this because they delay emitting register copies until *after* the stack arguments are set up. GISel however just processes and emits the arguments in IR order, so stack arguments always end up last, and thus this breaks the code that looks for any register arg copies that precede the call instruction. This patch adds a thunk argument to the assignValueToReg() and custom assignment hooks. For outgoing arguments, register assignments use this return param to return a thunk that does the actual generating of the copies. We collect these until all the outgoing stack assignments have been done and then execute them, so that the copies (and perhaps some artifacts like G_SEXTs) are placed after any stores. Differential Revision: https://reviews.llvm.org/D110610 |
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| .. | ||
| ADT | ||
| Analysis | ||
| AsmParser | ||
| BinaryFormat | ||
| Bitcode | ||
| Bitstream | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| ExecutionEngine | ||
| FileCheck | ||
| Frontend | ||
| FuzzMutate | ||
| IR | ||
| InterfaceStub | ||
| LineEditor | ||
| Linker | ||
| MC | ||
| MI | ||
| MIR | ||
| Object | ||
| ObjectYAML | ||
| Option | ||
| Passes | ||
| ProfileData | ||
| Remarks | ||
| Support | ||
| TableGen | ||
| Target | ||
| TextAPI | ||
| Transforms | ||
| XRay | ||
| tools | ||
| CMakeLists.txt | ||
| unittest.cfg.in | ||