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c9a1c9ca92
Statepoint instruction is known to have a variable and big number of operands. It is possible that Register Allocator will split live intervals in the way that all physical registers are occupied by "zero-length" live intervals which are marked as not-spillable. While intervals are marked as not-spillable in the moment of creation when they are really zero-length it is possible that in future as part of re-materialization there will need for physical register between def and use of such tiny interval (the use is not related to this interval at all). As all physical registers are assigned to not-spillable intervals there is not avaialbe registers and RA reports an error. The idea of the fix is avoid marking tiny live intervals where there is a use in statepoint instruction in var args section. Such interval may be perfectly spilled and folded to operand of statepoint. Reviewers: reames, dantrushin, qcolombet, dsanders, dmgreen Reviewed By: reames Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D98766 |
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