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(fold_rtx, case SUBREG): If paradoxical SUBREG of a constant, return 

the constant.

From-SVN: r5346
This commit is contained in:
Richard Kenner 1993-09-17 18:10:33 -04:00
parent c1719013cf
commit 31c85c78b1
1 changed files with 10 additions and 4 deletions
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14
gcc/cse.c
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@ -4582,7 +4582,9 @@ fold_rtx (x, insn)
extra bits would have. However, if the operand is equivalent
to a SUBREG whose operand is the same as our mode, and all the
modes are within a word, we can just use the inner operand
because these SUBREGs just say how to treat the register. */
because these SUBREGs just say how to treat the register.
Similarly if we find an integer constant. */
if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
{
@ -4593,9 +4595,13 @@ fold_rtx (x, insn)
&& GET_MODE_SIZE (imode) <= UNITS_PER_WORD
&& (elt = lookup (SUBREG_REG (x), HASH (SUBREG_REG (x), imode),
imode)) != 0)
{
for (elt = elt->first_same_value;
elt; elt = elt->next_same_value)
for (elt = elt->first_same_value;
elt; elt = elt->next_same_value)
{
if (CONSTANT_P (elt->exp)
&& GET_MODE (elt->exp) == VOIDmode)
return elt->exp;
if (GET_CODE (elt->exp) == SUBREG
&& GET_MODE (SUBREG_REG (elt->exp)) == mode
&& exp_equiv_p (elt->exp, elt->exp, 1, 0))