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In r270550, Jakub fixed classify_insn to handle asm goto: if the asm can jump to a label, the insn should be a JUMP_INSN. However, as the following testcase shows, non-null ASM_OPERANDS_LABEL_VEC doesn't guarantee that the rtx has any actual labels it can branch to. Here, the rtvec has 0 elements because expand_asm_stmt created it: rtvec labelvec = rtvec_alloc (nlabels); // nlabels == 0 This causes an ICE in update_br_prob_note: BRANCH_EDGE (bb) crashes because there's no branch edge. I think we can fix this by checking that there is at least one label the asm can jump to before wrapping the ASM_OPERANDS in a JUMP_INSN. PR rtl-optimization/104777 gcc/ChangeLog: * rtl.cc (classify_insn): For ASM_OPERANDS, return JUMP_INSN only if ASM_OPERANDS_LABEL_VEC has at least one element. gcc/testsuite/ChangeLog: * gcc.dg/torture/tls/pr104777.c: New test.
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