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Allow XFree86-4 to build

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by not creating paradoxical FLOAT_MODE subregs.

Tested by:	se
Obtained from:	http://gcc.gnu.org/ml/gcc/2002-06/msg01709.html
This commit is contained in:
David E. O'Brien 2002-07-03 23:35:06 +00:00
parent 4f8a0c7e27
commit fffe57845a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=99396
2 changed files with 37 additions and 12 deletions
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7
contrib/gcc/emit-rtl.c
View file

@ -19,6 +19,8 @@ along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/* $FreeBSD$ */
/* Middle-to-low level generation of rtx code and insns.
@ -831,6 +833,11 @@ gen_lowpart_common (mode, x)
> ((xsize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)))
return 0;
/* Don't allow generating paradoxical FLOAT_MODE subregs. */
if (GET_MODE_CLASS (mode) == MODE_FLOAT
&& GET_MODE (x) != VOIDmode && msize > xsize)
return 0;
offset = subreg_lowpart_offset (mode, GET_MODE (x));
if ((GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND)

42
contrib/gcc/recog.c
View file

@ -19,6 +19,8 @@ along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/* $FreeBSD$ */
#include "config.h"
#include "system.h"
@ -950,11 +952,13 @@ general_operand (op, mode)
if (code == SUBREG)
{
rtx sub = SUBREG_REG (op);
#ifdef INSN_SCHEDULING
/* On machines that have insn scheduling, we want all memory
reference to be explicit, so outlaw paradoxical SUBREGs. */
if (GET_CODE (SUBREG_REG (op)) == MEM
&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))))
if (GET_CODE (sub) == MEM
&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (sub)))
return 0;
#endif
/* Avoid memories with nonzero SUBREG_BYTE, as offsetting the memory
@ -964,10 +968,16 @@ general_operand (op, mode)
??? This is a kludge. */
if (!reload_completed && SUBREG_BYTE (op) != 0
&& GET_CODE (SUBREG_REG (op)) == MEM)
&& GET_CODE (sub) == MEM)
return 0;
op = SUBREG_REG (op);
/* FLOAT_MODE subregs can't be paradoxical. Combine will occasionally
create such rtl, and we must reject it. */
if (GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT
&& GET_MODE_SIZE (GET_MODE (op)) > GET_MODE_SIZE (GET_MODE (sub)))
return 0;
op = sub;
code = GET_CODE (op);
}
@ -1040,28 +1050,36 @@ register_operand (op, mode)
if (GET_CODE (op) == SUBREG)
{
rtx sub = SUBREG_REG (op);
/* Before reload, we can allow (SUBREG (MEM...)) as a register operand
because it is guaranteed to be reloaded into one.
Just make sure the MEM is valid in itself.
(Ideally, (SUBREG (MEM)...) should not exist after reload,
but currently it does result from (SUBREG (REG)...) where the
reg went on the stack.) */
if (! reload_completed && GET_CODE (SUBREG_REG (op)) == MEM)
if (! reload_completed && GET_CODE (sub) == MEM)
return general_operand (op, mode);
#ifdef CLASS_CANNOT_CHANGE_MODE
if (GET_CODE (SUBREG_REG (op)) == REG
&& REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER
if (GET_CODE (sub) == REG
&& REGNO (sub) < FIRST_PSEUDO_REGISTER
&& (TEST_HARD_REG_BIT
(reg_class_contents[(int) CLASS_CANNOT_CHANGE_MODE],
REGNO (SUBREG_REG (op))))
&& CLASS_CANNOT_CHANGE_MODE_P (mode, GET_MODE (SUBREG_REG (op)))
&& GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_INT
&& GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_FLOAT)
REGNO (sub)))
&& CLASS_CANNOT_CHANGE_MODE_P (mode, GET_MODE (sub))
&& GET_MODE_CLASS (GET_MODE (sub)) != MODE_COMPLEX_INT
&& GET_MODE_CLASS (GET_MODE (sub)) != MODE_COMPLEX_FLOAT)
return 0;
#endif
op = SUBREG_REG (op);
/* FLOAT_MODE subregs can't be paradoxical. Combine will occasionally
create such rtl, and we must reject it. */
if (GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT
&& GET_MODE_SIZE (GET_MODE (op)) > GET_MODE_SIZE (GET_MODE (sub)))
return 0;
op = sub;
}
/* If we have an ADDRESSOF, consider it valid since it will be