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

*** empty log message *** 

From-SVN: r1162
This commit is contained in:
Richard Stallman 1992-06-04 22:27:23 +00:00
parent d1c1397eeb
commit e4890d4537
1 changed files with 29 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
gcc/cse.c
View File

@ -4580,6 +4580,10 @@ fold_rtx (x, insn)
switch (GET_RTX_CLASS (code))
{
case '1':
/* We can't simplify extension ops unless we know the original mode. */
if ((code == ZERO_EXTEND || code == SIGN_EXTEND)
&& mode_arg0 == VOIDmode)
break;
new = simplify_unary_operation (code, mode,
const_arg0 ? const_arg0 : folded_arg0,
mode_arg0);
@ -6630,6 +6634,17 @@ cse_process_notes (x, object)
XEXP (x, 1) = cse_process_notes (XEXP (x, 1), 0);
return x;
case SIGN_EXTEND:
case ZERO_EXTEND:
{
rtx new = cse_process_notes (XEXP (x, 0), object);
/* We don't substitute VOIDmode constants into these rtx,
since they would impede folding. */
if (GET_MODE (new) != VOIDmode)
validate_change (object, &XEXP (x, 0), new, 0);
return x;
}
case REG:
i = reg_qty[REGNO (x)];
@ -7599,6 +7614,7 @@ delete_dead_from_cse (insns, nreg)
rtx insn;
rtx tem;
int i;
int in_libcall = 0;
/* First count the number of times each register is used. */
bzero (counts, sizeof (int) * nreg);
@ -7613,7 +7629,14 @@ delete_dead_from_cse (insns, nreg)
{
int live_insn = 0;
if (GET_CODE (PATTERN (insn)) == SET)
/* Don't delete any insns that are part of a libcall block.
Flow or loop might get confused if we did that. */
if (find_reg_note (insn, REG_LIBCALL, 0))
in_libcall = 1;
if (in_libcall)
live_insn = 1;
else if (GET_CODE (PATTERN (insn)) == SET)
{
if (GET_CODE (SET_DEST (PATTERN (insn))) == REG
&& SET_DEST (PATTERN (insn)) == SET_SRC (PATTERN (insn)))
@ -7665,16 +7688,17 @@ delete_dead_from_cse (insns, nreg)
live_insn = 1;
/* If this is a dead insn, delete it and show registers in it aren't
being used. If this is the last insn of a libcall sequence, don't
delete it even if it is dead because we don't know how to do so
here. */
being used. */
if (! live_insn && ! find_reg_note (insn, REG_RETVAL, 0))
if (! live_insn)
{
count_reg_usage (insn, counts, -1);
PUT_CODE (insn, NOTE);
NOTE_SOURCE_FILE (insn) = 0;
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
}
if (find_reg_note (insn, REG_RETVAL, 0))
in_libcall = 0;
}
}