efriedma added a comment. > A reserved physical register doesn't mean it can't be used by > compiler/linker, it just means it can't be used by register allocator, see > the comments in TargetRegisterInfo::getReservedRegs().
The target feature to "reserve" a register is meant to be "don't use this register for anything". For some registers, making sure the register isn't used by the register allocator is sufficient because the compiler/linker won't use them in any other way... but if the compiler uses a register outside register allocation, that doesn't work. If you want a target feature to simulate high register pressure without any expectation that the resulting code actually works, please add a separate "regalloc-test-reserve-all-regs" feature or something like that. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D132531/new/ https://reviews.llvm.org/D132531 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
