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m68hc11.c (m68hc11_override_options): Don't use soft registers by default for 68HC12.

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* config/m68hc11/m68hc11.c (m68hc11_override_options): Don't use
	soft registers by default for 68HC12.
	(m68hc11_conditional_register_usage): Don't use Z register for 68HC12
	when compiling with -fomit-frame-pointer.
	(expand_prologue): Use push/pop to allocate 4-bytes of locals on 68HC12.
	(expand_epilogue): Likewise.
	(m68hc11_gen_rotate): Use exg when rotating by 8.

From-SVN: r50882
This commit is contained in:
Stephane Carrez 2002-03-16 14:03:59 +01:00 • committed by Stephane Carrez
parent 840e2ff109
commit 121449b69b
2 changed files with 31 additions and 6 deletions
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10
gcc/ChangeLog
View file

@ -1,3 +1,13 @@
2002-03-16 Stephane Carrez <Stephane.Carrez@worldnet.fr>
* config/m68hc11/m68hc11.c (m68hc11_override_options): Don't use
soft registers by default for 68HC12.
(m68hc11_conditional_register_usage): Don't use Z register for 68HC12
when compiling with -fomit-frame-pointer.
(expand_prologue): Use push/pop to allocate 4-bytes of locals on 68HC12.
(expand_epilogue): Likewise.
(m68hc11_gen_rotate): Use exg when rotating by 8.
2002-03-16 Stephane Carrez <Stephane.Carrez@worldnet.fr>
* config/m68hc11/m68hc11-protos.h (ix_reg): Declare.

27
gcc/config/m68hc11/m68hc11.c
View file

@ -246,6 +246,8 @@ m68hc11_override_options ()
if (TARGET_DEFAULT != MASK_M6811)
target_flags &= ~TARGET_DEFAULT;
if (!TARGET_M6812)
target_flags &= ~TARGET_AUTO_INC_DEC;
m68hc11_cost = &m6811_cost;
m68hc11_min_offset = 0;
m68hc11_max_offset = 256;
@ -278,7 +280,7 @@ m68hc11_override_options ()
target_flags &= ~MASK_M6811;
target_flags |= MASK_NO_DIRECT_MODE;
if (m68hc11_soft_reg_count == 0)
m68hc11_soft_reg_count = "2";
m68hc11_soft_reg_count = "0";
}
return 0;
}
@ -301,6 +303,14 @@ m68hc11_conditional_register_usage ()
fixed_regs[i] = 1;
call_used_regs[i] = 1;
}
/* For 68HC12, the Z register emulation is not necessary when the
frame pointer is not used. The frame pointer is eliminated and
replaced by the stack register (which is a BASE_REG_CLASS). */
if (TARGET_M6812 && flag_omit_frame_pointer && optimize)
{
fixed_regs[HARD_Z_REGNUM] = 1;
}
}
@ -1664,7 +1674,7 @@ expand_prologue ()
emit_move_after_reload (stack_push_word, hard_frame_pointer_rtx, scratch);
/* Allocate local variables. */
if (TARGET_M6812 && size >= 2)
if (TARGET_M6812 && (size > 4 || size == 3))
{
emit_insn (gen_addhi3 (stack_pointer_rtx,
stack_pointer_rtx, GEN_INT (-size)));
@ -1752,7 +1762,7 @@ expand_epilogue ()
}
/* de-allocate auto variables */
if (TARGET_M6812 && size >= 2)
if (TARGET_M6812 && (size > 4 || size == 3))
{
emit_insn (gen_addhi3 (stack_pointer_rtx,
stack_pointer_rtx, GEN_INT (size)));
@ -3716,9 +3726,14 @@ m68hc11_gen_rotate (code, insn, operands)
/* Rotate by 8-bits if the shift is within [5..11]. */
if (val >= 5 && val <= 11)
{
output_asm_insn ("psha", operands);
output_asm_insn ("tba", operands);
output_asm_insn ("pulb", operands);
if (TARGET_M6812)
output_asm_insn ("exg\ta,b", operands);
else
{
output_asm_insn ("psha", operands);
output_asm_insn ("tba", operands);
output_asm_insn ("pulb", operands);
}
val -= 8;
}