Hi Joern, > > + insn = emit_insn (gen_blockage ()); > > Is this actually part of the patch to fix cfi generation?
This instruction prevents the delay branch scheduler to speculatively use epilogue instructions to fill up the delay slots. Hence, generating an assert during dwarf2cfi execution. This behavior is experiment by dg.exp/pr49994-1.s test. At a closer inspection of the patch, I've refurbish it in a more generic fashion (attached), where the blockage guards the entire expand epilogue process. It may be questionable if emitting blockage in epilogue is part of the cfi refactoring of the epilogue. However, without it we may still get errors in dwarf2cfi. Thanks, Claudiu
0001-Refurbish-emitting-DWARF2-related-information-when-e.patch
Description: 0001-Refurbish-emitting-DWARF2-related-information-when-e.patch
