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Fix sparc builtin_memcpy miscompilation.

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* expmed.c (store_bit_field): If need to add a SUBREG, then remove
	existing SUBREG if we can, otherwise abort.

From-SVN: r23215
This commit is contained in:
Jim Wilson 1998-10-21 19:27:19 +00:00 committed by Jim Wilson
parent 822a4ff162
commit 7be7a07d27
2 changed files with 17 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Oct 21 19:23:59 1998 Jim Wilson <wilson@cygnus.com>
* expmed.c (store_bit_field): If need to add a SUBREG, then remove
existing SUBREG if we can, otherwise abort.
Wed Oct 21 09:58:51 1998 Mark Mitchell <mark@markmitchell.com>
* c-common.c (c_apply_type_quals_to_decl): Don't crash when

13
gcc/expmed.c
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@ -423,7 +423,18 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, align, total_size)
|| GET_MODE_SIZE (GET_MODE (op0)) > UNITS_PER_WORD)
{
if (GET_CODE (op0) != REG)
op0 = copy_to_reg (op0);
{
/* Since this is a destination (lvalue), we can't copy it to a
pseudo. We can trivially remove a SUBREG that does not
change the size of the operand. Such a SUBREG may have been
added above. Otherwise, abort. */
if (GET_CODE (op0) == SUBREG
&& (GET_MODE_SIZE (GET_MODE (op0))
== GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)))))
op0 = SUBREG_REG (op0);
else
abort ();
}
op0 = gen_rtx_SUBREG (mode_for_size (BITS_PER_WORD, MODE_INT, 0),
op0, offset);
}