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expmed.c (expand_divmod): Don't widen for computing remainder if we seem to have a divmod pattern for...

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* expmed.c (expand_divmod): Don't widen for computing remainder
        if we seem to have a divmod pattern for needed mode.

From-SVN: r22828
This commit is contained in:
Torbjorn Granlund 1998-10-05 02:08:56 +02:00 committed by Jeff Law
parent 4284b774e6
commit 32fdf36bb6
2 changed files with 21 additions and 4 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Oct 5 01:07:23 1998 Torbjorn Granlund <tege@matematik.su.se>
* expmed.c (expand_divmod): Don't widen for computing remainder
if we seem to have a divmod pattern for needed mode.
Mon Oct 5 01:01:42 1998 Zack Weinberg <zack@rabi.phys.columbia.edu>
* cpplib.c (macroexpand): Correct off-by-one error in handling

20
gcc/expmed.c
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@ -3709,10 +3709,22 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
if (rem_flag)
{
/* Try to produce the remainder directly without a library call. */
remainder = sign_expand_binop (compute_mode, umod_optab, smod_optab,
op0, op1, target,
unsignedp, OPTAB_WIDEN);
/* Try to produce the remainder without producing the quotient.
If we seem to have a divmod patten that does not require widening,
don't try windening here. We should really have an WIDEN argument
to expand_twoval_binop, since what we'd really like to do here is
1) try a mod insn in compute_mode
2) try a divmod insn in compute_mode
3) try a div insn in compute_mode and multiply-subtract to get
remainder
4) try the same things with widening allowed. */
remainder
= sign_expand_binop (compute_mode, umod_optab, smod_optab,
op0, op1, target,
unsignedp,
((optab2->handlers[(int) compute_mode].insn_code
!= CODE_FOR_nothing)
? OPTAB_DIRECT : OPTAB_WIDEN));
if (remainder == 0)
{
/* No luck there. Can we do remainder and divide at once