Hi, Attached is Kaz's patch from the PR.
Tested against rev 185555 with make -k check RUNTESTFLAGS="--target_board=sh-sim \{-m2/-ml,-m2/-mb,-m2a-single/-mb, -m4-single/-ml,-m4-single/-mb, -m4a-single/-ml,-m4a-single/-mb}" It fixes a few "sometimes failing" libstdc++ failures. No new failures otherwise. OK to apply? Maybe this one should be backported to 4.7.x, too? Cheers, Oleg ChangeLog: PR/target 52642 * config/sh/sh.c (sh_expand_prologue): Emit blockage at the end of prologue for unwinder and profiler.
Index: gcc/config/sh/sh.c =================================================================== --- gcc/config/sh/sh.c (revision 185554) +++ gcc/config/sh/sh.c (working copy) @@ -7239,6 +7239,13 @@ emit_insn (gen_shcompact_incoming_args ()); } + /* If we are profiling, make sure no instructions are scheduled before + the call to mcount. Similarly if some call instructions are swapped + before frame related insns, it'll confuse the unwinder because + currently SH has no unwind info for function epilogues. */ + if (crtl->profile || flag_exceptions || flag_unwind_tables) + emit_insn (gen_blockage ()); + if (flag_stack_usage_info) current_function_static_stack_size = stack_usage; }