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Kuniyuki Iwashima reported in [1] that llvm compiler may convert a loop exit condition with "i < bound" to "i != bound", where "i" is the loop index variable and "bound" is the upper bound. In case that "bound" is not a constant, verifier will always have "i != bound" true, which will cause verifier failure since to verifier this is an infinite loop. The fix is to avoid transforming "i < bound" to "i != bound". In llvm, the transformation is done by IndVarSimplify pass. The compiler checks loop condition cost (i = i + 1) and if the cost is lower, it may transform "i < bound" to "i != bound". This patch implemented getArithmeticInstrCost() in BPF TargetTransformInfo class to return a higher cost for such an operation, which will prevent the transformation for the test case added in this patch. [1] https://lore.kernel.org/netdev/1994df05-8f01-371f-3c3b-d33d7836878c@fb.com/ Differential Revision: https://reviews.llvm.org/D107483 (cherry picked from commit e52946b9ababcbf8e6f40b1b15900ae2e795a1c6) |
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| .. | ||
| BTF | ||
| CORE | ||
| 32-bit-subreg-alu.ll | ||
| 32-bit-subreg-cond-select.ll | ||
| 32-bit-subreg-load-store.ll | ||
| 32-bit-subreg-peephole-phi-1.ll | ||
| 32-bit-subreg-peephole-phi-2.ll | ||
| 32-bit-subreg-peephole-phi-3.ll | ||
| 32-bit-subreg-peephole.ll | ||
| 32-bit-subreg-zext.ll | ||
| adjust-opt-icmp1.ll | ||
| adjust-opt-icmp2.ll | ||
| adjust-opt-speculative1.ll | ||
| adjust-opt-speculative2.ll | ||
| alu8.ll | ||
| atomics_2.ll | ||
| atomics.ll | ||
| basictest.ll | ||
| byval.ll | ||
| callx.ll | ||
| cc_args_be.ll | ||
| cc_args.ll | ||
| cc_ret.ll | ||
| cmp.ll | ||
| dwarfdump.ll | ||
| elf-symbol-information.ll | ||
| ex1.ll | ||
| fi_ri.ll | ||
| i128.ll | ||
| inline_asm.ll | ||
| inlineasm-output-template.ll | ||
| inlineasm-wreg.ll | ||
| intrinsics.ll | ||
| is_trunc_free.ll | ||
| is_zext_free.ll | ||
| lit.local.cfg | ||
| load.ll | ||
| loop-exit-cond.ll | ||
| loops.ll | ||
| many_args1.ll | ||
| many_args2.ll | ||
| mem_offset_be.ll | ||
| mem_offset.ll | ||
| memcpy-expand-in-order.ll | ||
| objdump_atomics.ll | ||
| objdump_cond_op_2.ll | ||
| objdump_cond_op.ll | ||
| objdump_dis_all.ll | ||
| objdump_imm_hex.ll | ||
| objdump_intrinsics.ll | ||
| objdump_nop.ll | ||
| objdump_static_var.ll | ||
| objdump_trivial.ll | ||
| objdump_two_funcs.ll | ||
| optnone-1.ll | ||
| optnone-2.ll | ||
| reloc-2.ll | ||
| reloc-3.ll | ||
| reloc-btf-2.ll | ||
| reloc-btf.ll | ||
| reloc.ll | ||
| remove_truncate_1.ll | ||
| remove_truncate_2.ll | ||
| remove_truncate_3.ll | ||
| remove_truncate_4.ll | ||
| remove_truncate_5.ll | ||
| remove_truncate_6.ll | ||
| remove_truncate_7.ll | ||
| remove_truncate_8.ll | ||
| rodata_1.ll | ||
| rodata_2.ll | ||
| rodata_3.ll | ||
| rodata_4.ll | ||
| rodata_5.ll | ||
| rodata_6.ll | ||
| rodata_7.ll | ||
| sanity.ll | ||
| sdiv_error.ll | ||
| select_ri.ll | ||
| selectiondag-bug.ll | ||
| setcc.ll | ||
| shifts.ll | ||
| simplifycfg.ll | ||
| sockex2.ll | ||
| struct_ret1.ll | ||
| struct_ret2.ll | ||
| undef.ll | ||
| vararg1.ll | ||
| warn-call.ll | ||
| warn-stack.ll | ||
| xadd_legal.ll | ||
| xadd.ll | ||