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My recent patch introducing cp_fold_immediate_r caused exponential compile time with nested COND_EXPRs. The problem is that the COND_EXPR case recursively walks the arms of a COND_EXPR, but after processing both arms it doesn't end the walk; it proceeds to walk the sub-expressions of the outermost COND_EXPR, triggering again walking the arms of the nested COND_EXPR, and so on. This patch brings the compile time down to about 0m0.030s. The ff_fold_immediate flag is unused after this patch but since I'm using it in the P2564 patch, I'm not removing it now. Maybe at_eof can be used instead and then we can remove ff_fold_immediate. PR c++/111660 gcc/cp/ChangeLog: * cp-gimplify.cc (cp_fold_immediate_r) <case COND_EXPR>: Don't handle it here. (cp_fold_r): Handle COND_EXPR here. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/hog1.C: New test. * g++.dg/cpp2a/consteval36.C: New test. |
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