procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

(force_reg): Don't make a REG_EQUAL note for an insn that doesn't set

Browse source 
TEMP.

From-SVN: r7771
This commit is contained in:
Richard Kenner 1994-07-14 09:42:18 -04:00
parent eb3a650753
commit 62874575d9
1 changed files with 7 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
gcc/explow.c
View file

@ -578,15 +578,19 @@ force_reg (mode, x)
enum machine_mode mode;
rtx x;
{
register rtx temp, insn;
register rtx temp, insn, set;
if (GET_CODE (x) == REG)
return x;
temp = gen_reg_rtx (mode);
insn = emit_move_insn (temp, x);
/* Let optimizers know that TEMP's value never changes
and that X can be substituted for it. */
if (CONSTANT_P (x))
and that X can be substituted for it. Don't get confused
if INSN set something else (such as a SUBREG of TEMP). */
if (CONSTANT_P (x)
&& (set = single_set (insn)) != 0
&& SET_DEST (set) == temp)
{
rtx note = find_reg_note (insn, REG_EQUAL, NULL_RTX);