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rs6000: Factor out emit_split_stack_prologue

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This is a first patch to make the prologue code more manageable.


	* config/rs6000/rs6000.c (emit_split_stack_prologue): New function,
	factored out from ...
	(rs6000_emit_prologue): ... here.

From-SVN: r249095
This commit is contained in:
Segher Boessenkool 2017-06-11 00:21:34 +02:00 committed by Segher Boessenkool
parent e525ddf40f
commit 85e71e3505
2 changed files with 53 additions and 39 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-06-10 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.c (emit_split_stack_prologue): New function,
factored out from ...
(rs6000_emit_prologue): ... here.
2017-06-10 Jan Hubicka <hubicka@ucw.cz>
* predict.c (drop_profile): Also drop individual bb/edge and cgraph

86
gcc/config/rs6000/rs6000.c
View File

@ -28106,6 +28106,51 @@ rs6000_set_handled_components (sbitmap components)
cfun->machine->lr_is_wrapped_separately = true;
}
/* Set up the arg pointer (r12) for -fsplit-stack code. If __morestack was
called, it left the arg pointer to the old stack in r29. Otherwise, the
arg pointer is the top of the current frame. */
static void
emit_split_stack_prologue (rs6000_stack_t *info, rtx_insn *sp_adjust,
HOST_WIDE_INT frame_off, rtx frame_reg_rtx)
{
cfun->machine->split_stack_argp_used = true;
if (sp_adjust)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
rtx sp_reg_rtx = gen_rtx_REG (Pmode, STACK_POINTER_REGNUM);
rtx set_r12 = gen_rtx_SET (r12, sp_reg_rtx);
emit_insn_before (set_r12, sp_adjust);
}
else if (frame_off != 0 || REGNO (frame_reg_rtx) != 12)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
if (frame_off == 0)
emit_move_insn (r12, frame_reg_rtx);
else
emit_insn (gen_add3_insn (r12, frame_reg_rtx, GEN_INT (frame_off)));
}
if (info->push_p)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
rtx r29 = gen_rtx_REG (Pmode, 29);
rtx cr7 = gen_rtx_REG (CCUNSmode, CR7_REGNO);
rtx not_more = gen_label_rtx ();
rtx jump;
jump = gen_rtx_IF_THEN_ELSE (VOIDmode,
gen_rtx_GEU (VOIDmode, cr7, const0_rtx),
gen_rtx_LABEL_REF (VOIDmode, not_more),
pc_rtx);
jump = emit_jump_insn (gen_rtx_SET (pc_rtx, jump));
JUMP_LABEL (jump) = not_more;
LABEL_NUSES (not_more) += 1;
emit_move_insn (r12, r29);
emit_label (not_more);
}
}
/* Emit function prologue as insns. */
void
@ -29006,46 +29051,9 @@ rs6000_emit_prologue (void)
emit_insn (gen_frame_store (reg, sp_reg_rtx, RS6000_TOC_SAVE_SLOT));
}
/* Set up the arg pointer (r12) for -fsplit-stack code. */
if (using_split_stack && split_stack_arg_pointer_used_p ())
{
/* Set up the arg pointer (r12) for -fsplit-stack code. If
__morestack was called, it left the arg pointer to the old
stack in r29. Otherwise, the arg pointer is the top of the
current frame. */
cfun->machine->split_stack_argp_used = true;
if (sp_adjust)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
rtx set_r12 = gen_rtx_SET (r12, sp_reg_rtx);
emit_insn_before (set_r12, sp_adjust);
}
else if (frame_off != 0 || REGNO (frame_reg_rtx) != 12)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
if (frame_off == 0)
emit_move_insn (r12, frame_reg_rtx);
else
emit_insn (gen_add3_insn (r12, frame_reg_rtx, GEN_INT (frame_off)));
}
if (info->push_p)
{
rtx r12 = gen_rtx_REG (Pmode, 12);
rtx r29 = gen_rtx_REG (Pmode, 29);
rtx cr7 = gen_rtx_REG (CCUNSmode, CR7_REGNO);
rtx not_more = gen_label_rtx ();
rtx jump;
jump = gen_rtx_IF_THEN_ELSE (VOIDmode,
gen_rtx_GEU (VOIDmode, cr7, const0_rtx),
gen_rtx_LABEL_REF (VOIDmode, not_more),
pc_rtx);
jump = emit_jump_insn (gen_rtx_SET (pc_rtx, jump));
JUMP_LABEL (jump) = not_more;
LABEL_NUSES (not_more) += 1;
emit_move_insn (r12, r29);
emit_label (not_more);
}
}
emit_split_stack_prologue (info, sp_adjust, frame_off, frame_reg_rtx);
}
/* Output .extern statements for the save/restore routines we use. */