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m32c-protos.h (m32c_illegal_subreg_p): New. 

* config/m32c/m32c-protos.h (m32c_illegal_subreg_p): New.
* config/m32c/m32c.c (legal_subregs): New.
(m32c_illegal_subreg_p): New.
* config/m32c/predicates.md (m32c_any_operand): Use it to reject
unsupported subregs of hard regs.

From-SVN: r121725
This commit is contained in:
DJ Delorie 2007-02-08 17:22:52 -05:00 committed by DJ Delorie
parent ff39b79b8f
commit f9b8943888
4 changed files with 89 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2007-02-08 DJ Delorie <dj@redhat.com>
* config/m32c/m32c-protos.h (m32c_illegal_subreg_p): New.
* config/m32c/m32c.c (legal_subregs): New.
(m32c_illegal_subreg_p): New.
* config/m32c/predicates.md (m32c_any_operand): Use it to reject
unsupported subregs of hard regs.
2007-02-08 Jan Hubicka <jh@suse.cz>
* tree-cfg.c (bsi_replace): Shortcut when replacing the statement with

1
gcc/config/m32c/m32c-protos.h
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@ -74,6 +74,7 @@ int m32c_extra_constraint_p (rtx, char, const char *);
int m32c_extra_constraint_p2 (rtx, char, const char *);
int m32c_hard_regno_nregs (int, MM);
int m32c_hard_regno_ok (int, MM);
bool m32c_illegal_subreg_p (rtx);
bool m32c_immd_dbl_mov (rtx *, MM);
rtx m32c_incoming_return_addr_rtx (void);
void m32c_initialize_trampoline (rtx, rtx, rtx);

75
gcc/config/m32c/m32c.c
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@ -2749,6 +2749,81 @@ m32c_insert_attributes (tree node ATTRIBUTE_UNUSED,
/* Predicates */
/* This is a list of legal subregs of hard regs. */
static struct {
enum machine_mode outer_mode_size;
enum machine_mode inner_mode_size;
unsigned int regno;
int byte_mask;
int legal_when;
} legal_subregs[] = {
{1, 2, R0_REGNO, 0x03, 1}, /* r0h r0l */
{1, 2, R1_REGNO, 0x03, 1}, /* r1h r1l */
{1, 2, A0_REGNO, 0x01, 1},
{1, 2, A1_REGNO, 0x01, 1},
{1, 4, A0_REGNO, 0x01, 1},
{1, 4, A1_REGNO, 0x01, 1},
{2, 4, R0_REGNO, 0x05, 1}, /* r2 r0 */
{2, 4, R1_REGNO, 0x05, 1}, /* r3 r1 */
{2, 4, A0_REGNO, 0x05, 16}, /* a1 a0 */
{2, 4, A0_REGNO, 0x01, 24}, /* a1 a0 */
{2, 4, A1_REGNO, 0x01, 24}, /* a1 a0 */
{4, 8, R0_REGNO, 0x55, 1}, /* r3 r1 r2 r0 */
};
/* Returns TRUE if OP is a subreg of a hard reg which we don't
support. */
bool
m32c_illegal_subreg_p (rtx op)
{
rtx orig_op = op;
int offset;
unsigned int i;
int src_mode, dest_mode;
if (GET_CODE (op) != SUBREG)
return false;
dest_mode = GET_MODE (op);
offset = SUBREG_BYTE (op);
op = SUBREG_REG (op);
src_mode = GET_MODE (op);
if (GET_MODE_SIZE (dest_mode) == GET_MODE_SIZE (src_mode))
return false;
if (GET_CODE (op) != REG)
return false;
if (REGNO (op) >= MEM0_REGNO)
return false;
offset = (1 << offset);
for (i = 0; i < sizeof(legal_subregs)/sizeof(legal_subregs[0]); i ++)
if (legal_subregs[i].outer_mode_size == GET_MODE_SIZE (dest_mode)
&& legal_subregs[i].regno == REGNO (op)
&& legal_subregs[i].inner_mode_size == GET_MODE_SIZE (src_mode)
&& legal_subregs[i].byte_mask & offset)
{
switch (legal_subregs[i].legal_when)
{
case 1:
return false;
case 16:
if (TARGET_A16)
return false;
break;
case 24:
if (TARGET_A24)
return false;
break;
}
}
return true;
}
/* Returns TRUE if we support a move between the first two operands.
At the moment, we just want to discourage mem to mem moves until
after reload, because reload has a hard time with our limited

6
gcc/config/m32c/predicates.md
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@ -27,7 +27,11 @@
(define_predicate "m32c_any_operand"
(ior (match_operand 0 "general_operand")
(match_operand 1 "memory_operand")))
(match_operand 1 "memory_operand"))
{
return ! m32c_illegal_subreg_p (op);
}
)
; Likewise for nonimmediate_operand.