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commit 311424833d5b7060c8381a6460030b2f38b30158 Author: Alexandre Oliva aoliva@redhat.com Date: Tue Aug 18 01:20:14 2015 -0300

incremental fixes for m68k and armeb --- gcc/cfgexpand.c | 44 +++++++++++++++++++++++++++++++++---------- gcc/cfgexpand.h | 2 +- gcc/function.c | 50 +++++++++++++++++++++++++++++++++++++++---------- gcc/tree-ssa-coalesce.c | 4 ++-- 4 files changed, 77 insertions(+), 23 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..147dc33 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -2934,6 +2934,21 @@ 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)); + + return result; +} + /* A subroutine of assign_parms. Arrange for the parameter to be present and valid in DATA->STACK_RTL. */

@@ -2956,8 +2971,7 @@ 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 +2982,7 @@ 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 +3030,11 @@ 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 +3139,7 @@ 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)) @@ -3349,7 +3367,7 @@ 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 +3473,15 @@ assign_parm_setup_stack (struct assign_parm_data_all *all, [...] 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 +3493,16 @@ assign_parm_setup_stack (struct assign_parm_data_all *all, t [...] = 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)); }