From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 49866 invoked by alias); 19 Aug 2015 06:47:36 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 49856 invoked by uid 89); 19 Aug 2015 06:47:35 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.1 required=5.0 tests=AWL,BAYES_50,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=no version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Wed, 19 Aug 2015 06:47:33 +0000 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 94B2691FE6; Wed, 19 Aug 2015 06:47:31 +0000 (UTC) Received: from freie.home (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t7J6lMuJ031700 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 19 Aug 2015 02:47:30 -0400 Received: from livre.home (livre.home [172.31.160.2]) by freie.home (8.14.8/8.14.8) with ESMTP id t7J6jm40022806; Wed, 19 Aug 2015 03:45:48 -0300 From: Alexandre Oliva To: Christophe Lyon , Andreas Schwab Cc: GCC Patches , Patrick Marlier , Jeff Law , James Greenhalgh , "H.J. Lu" , Segher Boessenkool , Richard Biener , GCC Patches , Christophe Lyon , David Edelsohn , Eric Botcazou Subject: Re: [PR64164] drop copyrename, integrate into expand References: <20150723203112.GB27818@gate.crashing.org> <20150810082355.GA31149@arm.com> <55C8BFC3.3030603@redhat.com> Date: Wed, 19 Aug 2015 06:50:00 -0000 In-Reply-To: (Alexandre Oliva's message of "Tue, 18 Aug 2015 00:05:11 -0300") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-SW-Source: 2015-08/txt/msg01045.txt.bz2 On Aug 18, 2015, Alexandre Oliva wrote: >>> On Aug 17, 2015, Christophe Lyon wrote: >>>> Since this was committed (r226901), I can see that the compiler build >>>> fails for armeb targets, when building libgcc: > This patch fixes this particular case. I'll also add this configuration > to the cross build tests I'm going to rerun shortly, before submitting a > followup formally, to see whether other non-MEM mems need to be handled > explicitly. On Aug 17, 2015, Andreas Schwab wrote: > Andreas Schwab writes: >> Alexandre Oliva writes: >> >>> Would you be so kind as to give it a spin on a m68k native? TIA, >> >> I tried it on ia64, and it falls flat on the floor. > It fixes the m68k failures, though. On Aug 17, 2015, Alexandre Oliva wrote: >> I tried it on ia64, and it falls flat on the floor. > Doh, I see a logic flaw in the patch I posted. There were other shortcomings in the snippets I posted before, revealed by testing on on various other targets: remaining BLKmode asserts, failure to deal with parms without a default def and split complex args with an unassigned stack address. This patch fixes them all. It was regstrapped on x86_64-linux-gnu, i686-linux-gnu, ppc64-linux-gnu, ppc64el-linux-gnu, and further tested with a compile-only 'make all' on a binutils+gcc+newlib tree on all tens of cross targets mentioned before, plus the armeb configuration Christophe mentioned. Ok to install? [PR64164] fix regressions reported on m68k and armeb From: Alexandre Oliva Defer stack slot address assignment for all parms that can't live in pseudos, and accept pseudos assignments in assign_param_setup_block. for gcc/ChangeLog PR rtl-optimization/64164 * cfgexpand.c (parm_maybe_byref_p): Renamed to... (parm_in_stack_slot_p): ... this. Disregard mode, what matters is whether the parm will live in a pseudo or a stack slot. (expand_one_ssa_partition): Deal with params without a default def. Disregard mode. * cfgexpand.h: Renamed function declaration. * tree-ssa-coalesce.c: Adjust. * function.c (split_complex_args): Allocate stack slot for unassigned parms before splitting. (parm_in_unassigned_mem_p): New. Use it instead of parm_maybe_byref_p throughout this file. (assign_parm_setup_block): Use it. Accept pseudos in the expand-assigned rtl. (assign_parm_setup_reg): Drop BLKmode requirement. (assign_parm_setup_stack): Allocate and fill in the address of unassigned MEM parms. --- gcc/cfgexpand.c | 44 ++++++++++++++++++++++------ gcc/cfgexpand.h | 2 + gcc/function.c | 74 ++++++++++++++++++++++++++++++++++++++++------- gcc/tree-ssa-coalesce.c | 4 +-- 4 files changed, 100 insertions(+), 24 deletions(-) diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 0bc20f6..d567a87 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -172,17 +172,23 @@ leader_merge (tree cur, tree next) return cur; } -/* Return true if VAR is a PARM_DECL or a RESULT_DECL of type BLKmode. +/* Return true if VAR is a PARM_DECL or a RESULT_DECL that ought to be + assigned to a stack slot. We can't have expand_one_ssa_partition + choose their address: the pseudo holding the address would be set + up too late for assign_params to copy the parameter if needed. + Such parameters are likely passed as a pointer to the value, rather than as a value, and so we must not coalesce them, nor allocate stack space for them before determining the calling conventions for - them. For their SSA_NAMEs, expand_one_ssa_partition emits RTL as - MEMs with pc_rtx as the address, and then it replaces the pc_rtx - with NULL so as to make sure the MEM is not used before it is - adjusted in assign_parm_setup_reg. */ + them. + + For their SSA_NAMEs, expand_one_ssa_partition emits RTL as MEMs + with pc_rtx as the address, and then it replaces the pc_rtx with + NULL so as to make sure the MEM is not used before it is adjusted + in assign_parm_setup_reg. */ bool -parm_maybe_byref_p (tree var) +parm_in_stack_slot_p (tree var) { if (!var || VAR_P (var)) return false; @@ -190,7 +196,7 @@ parm_maybe_byref_p (tree var) gcc_assert (TREE_CODE (var) == PARM_DECL || TREE_CODE (var) == RESULT_DECL); - return TYPE_MODE (TREE_TYPE (var)) == BLKmode; + return !use_register_for_decl (var); } /* Return the partition of the default SSA_DEF for decl VAR. */ @@ -1343,17 +1349,35 @@ expand_one_ssa_partition (tree var) if (!use_register_for_decl (var)) { - if (parm_maybe_byref_p (SSA_NAME_VAR (var)) - && ssa_default_def_partition (SSA_NAME_VAR (var)) == part) + /* We can't risk having the parm assigned to a MEM location + whose address references a pseudo, for the pseudo will only + be set up after arguments are copied to the stack slot. + + If the parm doesn't have a default def (e.g., because its + incoming value is unused), then we want to let assign_params + do the allocation, too. In this case we want to make sure + SSA_NAMEs associated with the parm don't get assigned to more + than one partition, lest we'd create two unassigned stac + slots for the same parm, thus the assert at the end of the + block. */ + if (parm_in_stack_slot_p (SSA_NAME_VAR (var)) + && (ssa_default_def_partition (SSA_NAME_VAR (var)) == part + || !ssa_default_def (cfun, SSA_NAME_VAR (var)))) { expand_one_stack_var_at (var, pc_rtx, 0, 0); rtx x = SA.partition_to_pseudo[part]; gcc_assert (GET_CODE (x) == MEM); - gcc_assert (GET_MODE (x) == BLKmode); gcc_assert (XEXP (x, 0) == pc_rtx); /* Reset the address, so that any attempt to use it will ICE. It will be adjusted in assign_parm_setup_reg. */ XEXP (x, 0) = NULL_RTX; + /* If the RTL associated with the parm is not what we have + just created, the parm has been split over multiple + partitions. In order for this to work, we must have a + default def for the parm, otherwise assign_params won't + know what to do. */ + gcc_assert (DECL_RTL_IF_SET (SSA_NAME_VAR (var)) == x + || ssa_default_def (cfun, SSA_NAME_VAR (var))); } else if (defer_stack_allocation (var, true)) add_stack_var (var); diff --git a/gcc/cfgexpand.h b/gcc/cfgexpand.h index 987cf356..d168672 100644 --- a/gcc/cfgexpand.h +++ b/gcc/cfgexpand.h @@ -22,7 +22,7 @@ along with GCC; see the file COPYING3. If not see extern tree gimple_assign_rhs_to_tree (gimple); extern HOST_WIDE_INT estimated_stack_frame_size (struct cgraph_node *); -extern bool parm_maybe_byref_p (tree); +extern bool parm_in_stack_slot_p (tree); extern rtx get_rtl_for_parm_ssa_default_def (tree var); diff --git a/gcc/function.c b/gcc/function.c index 715c19f..222c76f 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -153,6 +153,7 @@ static void do_clobber_return_reg (rtx, void *); static void do_use_return_reg (rtx, void *); static rtx rtl_for_parm (struct assign_parm_data_all *, tree); static void maybe_reset_rtl_for_parm (tree); +static bool parm_in_unassigned_mem_p (tree, rtx); /* Stack of nested functions. */ @@ -2326,6 +2327,22 @@ split_complex_args (struct assign_parm_data_all *all, vec *args) rtx rtl = rtl_for_parm (all, cparm); if (rtl) { + /* If this is parm is unassigned, assign it now: the + newly-created decls wouldn't expect the need for + assignment, and if they were assigned + independently, they might not end up in adjacent + slots, so unsplit wouldn't be able to fill in the + unassigned address of the complex MEM. */ + if (parm_in_unassigned_mem_p (cparm, rtl)) + { + int align = STACK_SLOT_ALIGNMENT + (TREE_TYPE (cparm), GET_MODE (rtl), MEM_ALIGN (rtl)); + rtx loc = assign_stack_local + (GET_MODE (rtl), GET_MODE_SIZE (GET_MODE (rtl)), + align); + XEXP (rtl, 0) = XEXP (loc, 0); + } + SET_DECL_RTL (p, read_complex_part (rtl, false)); SET_DECL_RTL (decl, read_complex_part (rtl, true)); @@ -2934,6 +2951,27 @@ assign_parm_setup_block_p (struct assign_parm_data_one *data) return false; } +/* Return true if FROM_EXPAND is a MEM with an address to be filled in + by assign_params. This should be the case if, and only if, + parm_in_stack_slot_p holds for the parm DECL that expanded to + FROM_EXPAND, so we check that, too. */ + +static bool +parm_in_unassigned_mem_p (tree decl, rtx from_expand) +{ + bool result = MEM_P (from_expand) && !XEXP (from_expand, 0); + + gcc_assert (result == parm_in_stack_slot_p (decl) + /* Maybe it was already assigned. That's ok, especially + for split complex args. */ + || (!result && MEM_P (from_expand) + && (XEXP (from_expand, 0) == virtual_stack_vars_rtx + || (GET_CODE (XEXP (from_expand, 0)) == PLUS + && XEXP (XEXP (from_expand, 0), 0) == virtual_stack_vars_rtx)))); + + return result; +} + /* A subroutine of assign_parms. Arrange for the parameter to be present and valid in DATA->STACK_RTL. */ @@ -2956,8 +2994,7 @@ assign_parm_setup_block (struct assign_parm_data_all *all, { DECL_ALIGN (parm) = MAX (DECL_ALIGN (parm), BITS_PER_WORD); rtx from_expand = rtl_for_parm (all, parm); - if (from_expand && (!parm_maybe_byref_p (parm) - || XEXP (from_expand, 0) != NULL_RTX)) + if (from_expand && !parm_in_unassigned_mem_p (parm, from_expand)) stack_parm = copy_rtx (from_expand); else { @@ -2968,8 +3005,7 @@ assign_parm_setup_block (struct assign_parm_data_all *all, if (from_expand) { gcc_assert (GET_CODE (stack_parm) == MEM); - gcc_assert (GET_CODE (from_expand) == MEM); - gcc_assert (XEXP (from_expand, 0) == NULL_RTX); + gcc_assert (parm_in_unassigned_mem_p (parm, from_expand)); XEXP (from_expand, 0) = XEXP (stack_parm, 0); PUT_MODE (from_expand, GET_MODE (stack_parm)); stack_parm = copy_rtx (from_expand); @@ -3017,6 +3053,11 @@ assign_parm_setup_block (struct assign_parm_data_all *all, else if (size == 0) ; + /* MEM may be a REG if coalescing assigns the param's partition + to a pseudo. */ + else if (REG_P (mem)) + emit_move_insn (mem, entry_parm); + /* If SIZE is that of a mode no bigger than a word, just use that mode's store operation. */ else if (size <= UNITS_PER_WORD) @@ -3121,7 +3162,7 @@ assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm, if (GET_MODE (parmreg) != promoted_nominal_mode) parmreg = gen_lowpart (promoted_nominal_mode, parmreg); } - else if (!from_expand || parm_maybe_byref_p (parm)) + else if (!from_expand || parm_in_unassigned_mem_p (parm, from_expand)) { parmreg = gen_reg_rtx (promoted_nominal_mode); if (!DECL_ARTIFICIAL (parm)) @@ -3131,7 +3172,6 @@ assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm, { gcc_assert (data->passed_pointer); gcc_assert (GET_CODE (from_expand) == MEM - && GET_MODE (from_expand) == BLKmode && XEXP (from_expand, 0) == NULL_RTX); XEXP (from_expand, 0) = parmreg; } @@ -3349,7 +3389,7 @@ assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm, did_conversion = true; } else if (GET_MODE (parmreg) == BLKmode) - gcc_assert (parm_maybe_byref_p (parm)); + gcc_assert (parm_in_stack_slot_p (parm)); else emit_move_insn (parmreg, src); @@ -3455,12 +3495,15 @@ assign_parm_setup_stack (struct assign_parm_data_all *all, tree parm, if (data->entry_parm != data->stack_parm) { rtx src, dest; + rtx from_expand = NULL_RTX; if (data->stack_parm == 0) { - rtx x = data->stack_parm = rtl_for_parm (all, parm); - if (x) - gcc_assert (GET_MODE (x) == GET_MODE (data->entry_parm)); + from_expand = rtl_for_parm (all, parm); + if (from_expand) + gcc_assert (GET_MODE (from_expand) == GET_MODE (data->entry_parm)); + if (from_expand && !parm_in_unassigned_mem_p (parm, from_expand)) + data->stack_parm = from_expand; } if (data->stack_parm == 0) @@ -3472,7 +3515,16 @@ assign_parm_setup_stack (struct assign_parm_data_all *all, tree parm, = assign_stack_local (GET_MODE (data->entry_parm), GET_MODE_SIZE (GET_MODE (data->entry_parm)), align); - set_mem_attributes (data->stack_parm, parm, 1); + if (!from_expand) + set_mem_attributes (data->stack_parm, parm, 1); + else + { + gcc_assert (GET_CODE (data->stack_parm) == MEM); + gcc_assert (parm_in_unassigned_mem_p (parm, from_expand)); + XEXP (from_expand, 0) = XEXP (data->stack_parm, 0); + PUT_MODE (from_expand, GET_MODE (data->stack_parm)); + data->stack_parm = copy_rtx (from_expand); + } } dest = validize_mem (copy_rtx (data->stack_parm)); diff --git a/gcc/tree-ssa-coalesce.c b/gcc/tree-ssa-coalesce.c index 08ce72c..6468012 100644 --- a/gcc/tree-ssa-coalesce.c +++ b/gcc/tree-ssa-coalesce.c @@ -1386,8 +1386,8 @@ gimple_can_coalesce_p (tree name1, tree name2) because it may be passed by reference. */ return ((!var1 || VAR_P (var1)) && (!var2 || VAR_P (var2))) || (/* The case var1 == var2 is already covered above. */ - !parm_maybe_byref_p (var1) - && !parm_maybe_byref_p (var2) + !parm_in_stack_slot_p (var1) + && !parm_in_stack_slot_p (var2) && promote_ssa_mode (name1, NULL) == promote_ssa_mode (name2, NULL)); } -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist|Red Hat Brasil GNU Toolchain Engineer