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[SH] PR 52642 - libstdc++ failures
- From: Oleg Endo <oleg dot endo at t-online dot de>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Tue, 20 Mar 2012 21:40:20 +0100
- Subject: [SH] PR 52642 - libstdc++ failures
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;
}