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[PATCH, moxie] clean up function prologues
- From: Anthony Green <green at moxielogic dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 7 Sep 2012 21:12:29 -0400
- Subject: [PATCH, moxie] clean up function prologues
The prologue code for functions with large static stack space
requirements was really ugly on moxie. This patch cleans things up
and I am committing this change.
2012-09-07 Anthony Green <green@moxielogic.com>
* config/moxie/moxie.c (moxie_expand_prologue): Optimize prologue
for functions with large static stack requirements.
(moxie_expand_epilogue): Use $r12 instead of $r5 for pulling saved
values off of the stack.
diff --git a/gcc/gcc/config/moxie/moxie.c b/gcc/gcc/config/moxie/moxie.c
index d70eaac..567e759 100644
--- a/gcc/gcc/config/moxie/moxie.c
+++ b/gcc/gcc/config/moxie/moxie.c
@@ -1,5 +1,5 @@
/* Target Code for moxie
- Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation
+ Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation
Contributed by Anthony Green.
This file is part of GCC.
@@ -293,8 +293,8 @@ moxie_expand_prologue (void)
if (cfun->machine->size_for_adjusting_sp > 0)
{
- int i = cfun->machine->size_for_adjusting_sp;
- while (i > 255)
+ int i = cfun->machine->size_for_adjusting_sp;
+ while ((i >= 255) && (i <= 510))
{
insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
stack_pointer_rtx,
@@ -302,13 +302,23 @@ moxie_expand_prologue (void)
RTX_FRAME_RELATED_P (insn) = 1;
i -= 255;
}
- if (i > 0)
+ if (i <= 255)
{
insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
stack_pointer_rtx,
GEN_INT (i)));
RTX_FRAME_RELATED_P (insn) = 1;
}
+ else
+ {
+ rtx reg = gen_rtx_REG (SImode, MOXIE_R12);
+ insn = emit_move_insn (reg, GEN_INT (i));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
+ stack_pointer_rtx,
+ reg));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
}
}
@@ -320,7 +330,7 @@ moxie_expand_epilogue (void)
if (cfun->machine->callee_saved_reg_size != 0)
{
- reg = gen_rtx_REG (Pmode, MOXIE_R5);
+ reg = gen_rtx_REG (Pmode, MOXIE_R12);
if (cfun->machine->callee_saved_reg_size <= 255)
{
emit_move_insn (reg, hard_frame_pointer_rtx);