[RFC][PATCH] Clean up of histogram allocation and release.

[Martin Liška]

Hi.

Attempt of the patch is to remove all histograms right after
"profile_estimate" pass. Then nobody should use them. That
will simplify code we'll not need verification and currently
we leaked some histograms till the end of compilation.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.

Ready to be installed?
Martin

gcc/ChangeLog:

2018-07-31  Martin Liska  <mliska@suse.cz>

	* auto-profile.c (afdo_indirect_call): Do not remove
        histograms.
	* cfgexpand.c (pass_expand::execute): Likewise.
	* cgraph.c (release_function_body): Likewise.
	* gimple-iterator.c (gsi_replace): Likewise.
	(gsi_remove): Likewise.
	* ipa-profile.c (ipa_profile_generate_summary):
        Release all histograms.
	* tree-cfg.c (verify_gimple_in_cfg): Do not
        verify histograms.
	(move_block_to_fn): Do not remove histograms.
	* value-prof.c (gimple_remove_histogram_value):
        Remove.
	(gimple_remove_stmt_histograms): Likewise.
	(visit_hist): Likewise.
	(verify_histograms): Likewise.
	(gimple_divmod_fixed_value_transform): Do not
        remove histograms.
	(gimple_mod_pow2_value_transform): Likewise.
	(gimple_mod_subtract_transform): Likewise.
	(gimple_ic_transform): Likewise.
	(gimple_stringops_transform): Likewise.
	(stringop_block_profile): Likewise.
	(gimple_find_values_to_profile): Do not produce
        extra dump file output.
	* value-prof.h: Remove declarations.

gcc/testsuite/ChangeLog:

2018-07-31  Martin Liska  <mliska@suse.cz>

	* gcc.dg/tree-prof/val-prof-6.c: Do not scan histograms
        in optimized dump, it's already removed in that pass.
---
 gcc/auto-profile.c                          |   1 -
 gcc/cfgexpand.c                             |   1 -
 gcc/cgraph.c                                |   2 -
 gcc/gimple-iterator.c                       |   2 -
 gcc/ipa-profile.c                           |   6 +-
 gcc/testsuite/gcc.dg/tree-prof/val-prof-6.c |   6 +-
 gcc/tree-cfg.c                              |   2 -
 gcc/value-prof.c                            | 127 +-------------------
 gcc/value-prof.h                            |   3 -
 9 files changed, 11 insertions(+), 139 deletions(-)


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