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rtlanal.c (subreg_offset_representable_p): Handle objects with holes. 

* rtlanal.c (subreg_offset_representable_p): Handle objects
	with holes.

From-SVN: r100700
This commit is contained in:
Geoffrey Keating 2005-06-07 08:18:15 +00:00 committed by Geoffrey Keating
parent bd127a7515
commit dd79bb7eb7
2 changed files with 88 additions and 13 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-06-07 Geoffrey Keating <geoffk@apple.com>
* rtlanal.c (subreg_offset_representable_p): Handle objects
with holes.
2005-06-06 Uros Bizjak <uros@kss-loka.si>
* mode-switching.c (optimize_mode_switching): Fix n_exprs parameter

96
gcc/rtlanal.c
View File

@ -3033,13 +3033,37 @@ unsigned int
subreg_regno_offset (unsigned int xregno, enum machine_mode xmode,
unsigned int offset, enum machine_mode ymode)
{
int nregs_xmode, nregs_ymode;
int nregs_xmode, nregs_ymode, nregs_xmode_unit_int;
int mode_multiple, nregs_multiple;
int y_offset;
enum machine_mode xmode_unit, xmode_unit_int;
gcc_assert (xregno < FIRST_PSEUDO_REGISTER);
nregs_xmode = hard_regno_nregs[xregno][xmode];
if (GET_MODE_INNER (xmode) == VOIDmode)
xmode_unit = xmode;
else
xmode_unit = GET_MODE_INNER (xmode);
if (FLOAT_MODE_P (xmode_unit))
{
xmode_unit_int = int_mode_for_mode (xmode_unit);
if (xmode_unit_int == BLKmode)
/* It's probably bad to be here; a port should have an integer mode
that's the same size as anything of which it takes a SUBREG. */
xmode_unit_int = xmode_unit;
}
else
xmode_unit_int = xmode_unit;
nregs_xmode_unit_int = hard_regno_nregs[xregno][xmode_unit_int];
/* Adjust nregs_xmode to allow for 'holes'. */
if (nregs_xmode_unit_int != hard_regno_nregs[xregno][xmode_unit])
nregs_xmode = nregs_xmode_unit_int * GET_MODE_NUNITS (xmode);
else
nregs_xmode = hard_regno_nregs[xregno][xmode];
nregs_ymode = hard_regno_nregs[xregno][ymode];
/* If this is a big endian paradoxical subreg, which uses more actual
@ -3054,7 +3078,7 @@ subreg_regno_offset (unsigned int xregno, enum machine_mode xmode,
if (offset == 0 || nregs_xmode == nregs_ymode)
return 0;
/* size of ymode must not be greater than the size of xmode. */
/* Size of ymode must not be greater than the size of xmode. */
mode_multiple = GET_MODE_SIZE (xmode) / GET_MODE_SIZE (ymode);
gcc_assert (mode_multiple != 0);
@ -3069,36 +3093,82 @@ subreg_regno_offset (unsigned int xregno, enum machine_mode xmode,
xmode - The mode of xregno.
offset - The byte offset.
ymode - The mode of a top level SUBREG (or what may become one).
RETURN - The regno offset which would be used. */
RETURN - Whether the offset is representable. */
bool
subreg_offset_representable_p (unsigned int xregno, enum machine_mode xmode,
unsigned int offset, enum machine_mode ymode)
{
int nregs_xmode, nregs_ymode;
int nregs_xmode, nregs_ymode, nregs_xmode_unit, nregs_xmode_unit_int;
int mode_multiple, nregs_multiple;
int y_offset;
enum machine_mode xmode_unit, xmode_unit_int;
gcc_assert (xregno < FIRST_PSEUDO_REGISTER);
nregs_xmode = hard_regno_nregs[xregno][xmode];
if (GET_MODE_INNER (xmode) == VOIDmode)
xmode_unit = xmode;
else
xmode_unit = GET_MODE_INNER (xmode);
if (FLOAT_MODE_P (xmode_unit))
{
xmode_unit_int = int_mode_for_mode (xmode_unit);
if (xmode_unit_int == BLKmode)
/* It's probably bad to be here; a port should have an integer mode
that's the same size as anything of which it takes a SUBREG. */
xmode_unit_int = xmode_unit;
}
else
xmode_unit_int = xmode_unit;
nregs_xmode_unit = hard_regno_nregs[xregno][xmode_unit];
nregs_xmode_unit_int = hard_regno_nregs[xregno][xmode_unit_int];
/* If there are holes in a non-scalar mode in registers, we expect
that it is made up of its units concatenated together. */
if (nregs_xmode_unit != nregs_xmode_unit_int)
{
gcc_assert (nregs_xmode_unit * GET_MODE_NUNITS (xmode)
== hard_regno_nregs[xregno][xmode]);
/* You can only ask for a SUBREG of a value with holes in the middle
if you don't cross the holes. (Such a SUBREG should be done by
picking a different register class, or doing it in memory if
necessary.) An example of a value with holes is XCmode on 32-bit
x86 with -m128bit-long-double; it's represented in 6 32-bit registers,
3 for each part, but in memory it's two 128-bit parts.
Padding is assumed to be at the end (not necessarily the 'high part')
of each unit. */
if (nregs_xmode_unit != nregs_xmode_unit_int
&& (offset / GET_MODE_SIZE (xmode_unit_int) + 1
< GET_MODE_NUNITS (xmode))
&& (offset / GET_MODE_SIZE (xmode_unit_int)
!= ((offset + GET_MODE_SIZE (ymode) - 1)
/ GET_MODE_SIZE (xmode_unit_int))))
return false;
nregs_xmode = nregs_xmode_unit_int * GET_MODE_NUNITS (xmode);
}
else
nregs_xmode = hard_regno_nregs[xregno][xmode];
nregs_ymode = hard_regno_nregs[xregno][ymode];
/* Paradoxical subregs are always valid. */
/* Paradoxical subregs are otherwise valid. */
if (offset == 0
&& nregs_ymode > nregs_xmode
&& (GET_MODE_SIZE (ymode) > UNITS_PER_WORD
? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN))
return true;
/* Lowpart subregs are always valid. */
/* Lowpart subregs are otherwise valid. */
if (offset == subreg_lowpart_offset (ymode, xmode))
return true;
/* This should always pass, otherwise we don't know how to verify the
constraint. These conditions may be relaxed but subreg_offset would
need to be redesigned. */
/* This should always pass, otherwise we don't know how to verify
the constraint. These conditions may be relaxed but
subreg_regno_offset would need to be redesigned. */
gcc_assert ((GET_MODE_SIZE (xmode) % GET_MODE_SIZE (ymode)) == 0);
gcc_assert ((GET_MODE_SIZE (ymode) % nregs_ymode) == 0);
gcc_assert ((nregs_xmode % nregs_ymode) == 0);
/* The XMODE value can be seen as a vector of NREGS_XMODE
@ -3109,7 +3179,7 @@ subreg_offset_representable_p (unsigned int xregno, enum machine_mode xmode,
/ nregs_xmode,
MODE_INT, 0));
/* size of ymode must not be greater than the size of xmode. */
/* Size of ymode must not be greater than the size of xmode. */
mode_multiple = GET_MODE_SIZE (xmode) / GET_MODE_SIZE (ymode);
gcc_assert (mode_multiple != 0);