OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(try_combine): Don't make complemented NOT for constant out of range.

Browse Source 
From-SVN: r7370
This commit is contained in:
Richard Kenner 1994-05-27 16:42:08 -04:00
parent d46f42a50a
commit 8080be5fdd
1 changed files with 0 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
gcc/combine.c
View File

@ -1704,32 +1704,6 @@ try_combine (i3, i2, i1)
insn_code_number = recog_for_combine (&newpat, i3, &new_i3_notes);
}
/* See if this is an XOR. If so, perhaps the problem is that the
constant is out of range. Replace it with a complemented XOR with
a complemented constant; it might be in range. */
else if (insn_code_number < 0 && GET_CODE (newpat) == SET
&& GET_CODE (SET_SRC (newpat)) == XOR
&& GET_CODE (XEXP (SET_SRC (newpat), 1)) == CONST_INT
&& ((temp = simplify_unary_operation (NOT,
GET_MODE (SET_SRC (newpat)),
XEXP (SET_SRC (newpat), 1),
GET_MODE (SET_SRC (newpat))))
!= 0))
{
enum machine_mode i_mode = GET_MODE (SET_SRC (newpat));
rtx pat
= gen_rtx_combine (SET, VOIDmode, SET_DEST (newpat),
gen_unary (NOT, i_mode,
gen_binary (XOR, i_mode,
XEXP (SET_SRC (newpat), 0),
temp)));
insn_code_number = recog_for_combine (&pat, i3, &new_i3_notes);
if (insn_code_number >= 0)
newpat = pat;
}
/* If we were combining three insns and the result is a simple SET
with no ASM_OPERANDS that wasn't recognized, try to split it into two
insns. There are two ways to do this. It can be split using a