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m68hc11.c (m68hc11_autoinc_compatible_p): New function.

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* config/m68hc11/m68hc11.c (m68hc11_autoinc_compatible_p): New function.
	(m68hc11_split_move): Call it to see if the source and destination
	operands use the same direction auto inc/dec mode, otherwise make the
	source an offsetable operand and generate an add.

From-SVN: r51264
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Stephane Carrez 2002-03-24 17:09:04 +01:00 committed by Stephane Carrez
parent 2e3d348133
commit 7590cfd0ca
2 changed files with 64 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2002-03-24 Stephane Carrez <Stephane.Carrez@worldnet.fr>
* config/m68hc11/m68hc11.c (m68hc11_autoinc_compatible_p): New function.
(m68hc11_split_move): Call it to see if the source and destination
operands use the same direction auto inc/dec mode, otherwise make the
source an offsetable operand and generate an add.
2002-03-24 Stephane Carrez <Stephane.Carrez@worldnet.fr>
* config/m68hc11/m68hc11.md ("*subsi3_zero_extendhi"): Allow address

57
gcc/config/m68hc11/m68hc11.c
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@ -2683,6 +2683,39 @@ m68hc11_expand_compare_and_branch (code, op0, op1, label)
return 0;
}
/* Return 1 if the TO and FROM operands contain compatible address
increment and decrement modes for a split_move. One of the two
operands must not use an autoinc mode or both must go in the
same direction. */
static int
m68hc11_autoinc_compatible_p (to, from)
rtx to, from;
{
enum { INCOP, DECOP } type_to, type_from;
/* If one of them is not a MEM, it is ok. */
if (GET_CODE (to) != MEM || GET_CODE (from) != MEM)
return 1;
to = XEXP (to, 0);
from = XEXP (from, 0);
if (GET_CODE (to) == PRE_INC || GET_CODE (to) == POST_INC)
type_to = INCOP;
else if (GET_CODE (to) == PRE_DEC || GET_CODE (to) == POST_DEC)
type_to = DECOP;
else
return 1;
if (GET_CODE (from) == PRE_INC || GET_CODE (from) == POST_INC)
type_from = INCOP;
else if (GET_CODE (from) == PRE_DEC || GET_CODE (from) == POST_DEC)
type_from = DECOP;
else
return 1;
return type_to == type_from;
}
/* Split a DI, SI or HI move into several smaller move operations.
The scratch register 'scratch' is used as a temporary to load
@ -2704,6 +2737,30 @@ m68hc11_split_move (to, from, scratch)
else
mode = QImode;
/* If the TO and FROM contain autoinc modes that are not compatible
together (one pop and the other a push), we must change one to
an offsetable operand and generate an appropriate add at the end. */
if (TARGET_M6812 && m68hc11_autoinc_compatible_p (to, from) == 0)
{
rtx reg;
int code;
/* Decide to change the source. */
code = GET_CODE (XEXP (from, 0));
reg = XEXP (XEXP (from, 0), 0);
offset = GET_MODE_SIZE (GET_MODE (from));
if (code == PRE_DEC || code == POST_DEC)
offset = -offset;
if (code == PRE_DEC || code == PRE_INC)
emit_insn (gen_addhi3 (reg, reg, GEN_INT (offset)));
m68hc11_split_move (to, gen_rtx_MEM (GET_MODE (from), reg), scratch);
if (code == POST_DEC || code == POST_INC)
emit_insn (gen_addhi3 (reg, reg, GEN_INT (offset)));
return;
}
if (TARGET_M6812
&& IS_STACK_PUSH (to)
&& reg_mentioned_p (gen_rtx (REG, HImode, HARD_SP_REGNUM), from))