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(find_comparison_args): New args PMODE1, PMODE2.

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(fold_rtx, record_jump_equiv): Use them to get modes of comparison.
(fold_rtx): Associate MINUS with nested PLUS.

From-SVN: r2197
This commit is contained in:
Richard Stallman 1992-09-21 03:51:25 +00:00
parent e64ff1039c
commit 13c9910fdd
1 changed files with 29 additions and 22 deletions
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49
gcc/cse.c
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@ -2629,9 +2629,10 @@ find_best_addr (insn, loc)
A or the code corresponding to the inverse of the comparison. */
static enum rtx_code
find_comparison_args (code, parg1, parg2)
find_comparison_args (code, parg1, parg2, pmode1, pmode2)
enum rtx_code code;
rtx *parg1, *parg2;
enum machine_mode *pmode1, *pmode2;
{
rtx arg1, arg2;
@ -2770,7 +2771,9 @@ find_comparison_args (code, parg1, parg2)
code = reverse_condition (code);
}
/* Return our results. */
/* Return our results. Return the modes from before fold_rtx
because fold_rtx might produce const_int, and then it's too late. */
*pmode1 = GET_MODE (arg1), *pmode2 = GET_MODE (arg2);
*parg1 = fold_rtx (arg1, 0), *parg2 = fold_rtx (arg2, 0);
return code;
@ -4848,6 +4851,7 @@ fold_rtx (x, insn)
{
struct table_elt *p0, *p1;
rtx true = const_true_rtx, false = const0_rtx;
enum machine_mode mode_arg1;
#ifdef FLOAT_STORE_FLAG_VALUE
if (GET_MODE_CLASS (mode) == MODE_FLOAT)
@ -4857,23 +4861,14 @@ fold_rtx (x, insn)
}
#endif
code = find_comparison_args (code, &folded_arg0, &folded_arg1);
code = find_comparison_args (code, &folded_arg0, &folded_arg1,
&mode_arg0, &mode_arg1);
const_arg0 = equiv_constant (folded_arg0);
const_arg1 = equiv_constant (folded_arg1);
/* Get a mode from the values actually being compared, or from the
old value of MODE_ARG0 if both are constants. If the resulting
mode is VOIDmode or a MODE_CC mode, we don't know what kinds
of things are being compared, so we can't do anything with this
comparison. */
if (GET_MODE (folded_arg0) != VOIDmode
&& GET_MODE_CLASS (GET_MODE (folded_arg0)) != MODE_CC)
mode_arg0 = GET_MODE (folded_arg0);
else if (GET_MODE (folded_arg1) != VOIDmode
&& GET_MODE_CLASS (GET_MODE (folded_arg1)) != MODE_CC)
mode_arg0 = GET_MODE (folded_arg1);
/* If the mode is VOIDmode or a MODE_CC mode, we don't know
what kinds of things are being compared, so we can't do
anything with this comparison. */
if (mode_arg0 == VOIDmode || GET_MODE_CLASS (mode_arg0) == MODE_CC)
break;
@ -5020,10 +5015,21 @@ fold_rtx (x, insn)
&& XEXP (XEXP (y, 1), 0) == XEXP (const_arg1, 0))
return XEXP (y, 0);
}
goto from_plus;
case MINUS:
/* If we have (MINUS Y C), see if Y is known to be (PLUS Z C2).
If so, produce (PLUS Z C2-C). */
if (const_arg1 != 0 && GET_CODE (const_arg1) == CONST_INT)
{
rtx y = lookup_as_function (XEXP (x, 0), PLUS);
if (y && GET_CODE (XEXP (y, 1)) == CONST_INT)
return fold_rtx (plus_constant (y, -INTVAL (const_arg1)));
}
/* ... fall through ... */
case MINUS:
from_plus:
case SMIN: case SMAX: case UMIN: case UMAX:
case IOR: case AND: case XOR:
case MULT: case DIV: case UDIV:
@ -5241,7 +5247,7 @@ record_jump_equiv (insn, taken)
{
int cond_known_true;
rtx op0, op1;
enum machine_mode mode;
enum machine_mode mode, mode0, mode1;
int reversed_nonequality = 0;
enum rtx_code code;
@ -5262,7 +5268,7 @@ record_jump_equiv (insn, taken)
op0 = fold_rtx (XEXP (XEXP (SET_SRC (PATTERN (insn)), 0), 0), insn);
op1 = fold_rtx (XEXP (XEXP (SET_SRC (PATTERN (insn)), 0), 1), insn);
code = find_comparison_args (code, &op0, &op1);
code = find_comparison_args (code, &op0, &op1, &mode0, &mode1);
if (! cond_known_true)
{
reversed_nonequality = (code != EQ && code != NE);
@ -5270,8 +5276,9 @@ record_jump_equiv (insn, taken)
}
/* The mode is the mode of the non-constant. */
mode = GET_MODE (op0);
if (mode == VOIDmode) mode = GET_MODE (op1);
mode = mode0;
if (mode1 != VOIDmode)
mode = mode1;
record_jump_cond (code, mode, op0, op1, reversed_nonequality);
}