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explow: Allow dynamic allocations after vregs

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This patch allows allocate_dynamic_stack_space to be called before
or after virtual registers have been instantiated.  It uses the
same approach as allocate_stack_local, which already supported this.

gcc/
	* function.h (get_stack_dynamic_offset): Declare.
	* function.cc (get_stack_dynamic_offset): New function,
	split out from...
	(get_stack_dynamic_offset): ...here.
	* explow.cc (allocate_dynamic_stack_space): Handle calls made
	after virtual registers have been instantiated.
This commit is contained in:
Richard Sandiford 2023-11-06 10:49:58 +00:00
parent 17df6ddcf1
commit a7a45364dd
3 changed files with 19 additions and 4 deletions
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10
gcc/explow.cc
View file

@ -1375,12 +1375,16 @@ allocate_dynamic_stack_space (rtx size, unsigned size_align,
HOST_WIDE_INT stack_usage_size = -1;
rtx_code_label *final_label;
rtx final_target, target;
rtx addr = (virtuals_instantiated
? plus_constant (Pmode, stack_pointer_rtx,
get_stack_dynamic_offset ())
: virtual_stack_dynamic_rtx);
/* If we're asking for zero bytes, it doesn't matter what we point
to since we can't dereference it. But return a reasonable
address anyway. */
if (size == const0_rtx)
return virtual_stack_dynamic_rtx;
return addr;
/* Otherwise, show we're calling alloca or equivalent. */
cfun->calls_alloca = 1;
@ -1532,7 +1536,7 @@ allocate_dynamic_stack_space (rtx size, unsigned size_align,
poly_int64 saved_stack_pointer_delta;
if (!STACK_GROWS_DOWNWARD)
emit_move_insn (target, virtual_stack_dynamic_rtx);
emit_move_insn (target, force_operand (addr, target));
/* Check stack bounds if necessary. */
if (crtl->limit_stack)
@ -1575,7 +1579,7 @@ allocate_dynamic_stack_space (rtx size, unsigned size_align,
stack_pointer_delta = saved_stack_pointer_delta;
if (STACK_GROWS_DOWNWARD)
emit_move_insn (target, virtual_stack_dynamic_rtx);
emit_move_insn (target, force_operand (addr, target));
}
suppress_reg_args_size = false;

12
gcc/function.cc
View file

@ -1943,6 +1943,16 @@ instantiate_decls (tree fndecl)
vec_free (cfun->local_decls);
}
/* Return the value of STACK_DYNAMIC_OFFSET for the current function.
This is done through a function wrapper so that the macro sees a
predictable set of included files. */
poly_int64
get_stack_dynamic_offset ()
{
return STACK_DYNAMIC_OFFSET (current_function_decl);
}
/* Pass through the INSNS of function FNDECL and convert virtual register
references to hard register references. */
@ -1954,7 +1964,7 @@ instantiate_virtual_regs (void)
/* Compute the offsets to use for this function. */
in_arg_offset = FIRST_PARM_OFFSET (current_function_decl);
var_offset = targetm.starting_frame_offset ();
dynamic_offset = STACK_DYNAMIC_OFFSET (current_function_decl);
dynamic_offset = get_stack_dynamic_offset ();
out_arg_offset = STACK_POINTER_OFFSET;
#ifdef FRAME_POINTER_CFA_OFFSET
cfa_offset = FRAME_POINTER_CFA_OFFSET (current_function_decl);

1
gcc/function.h
View file

@ -715,6 +715,7 @@ extern vec<edge> convert_jumps_to_returns (basic_block last_bb, bool simple_p,
extern basic_block emit_return_for_exit (edge exit_fallthru_edge,
bool simple_p);
extern void reposition_prologue_and_epilogue_notes (void);
extern poly_int64 get_stack_dynamic_offset ();
/* Returns the name of the current function. */
extern const char *fndecl_name (tree);