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expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use consistent.

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* expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use
        consistent.
        * tm.texi (Costs): Say MOVE_RATIO is number of mem-mem move
        *sequences* *below* which scalar moves will be used.

From-SVN: r22107
This commit is contained in:
Hans-Peter Nilsson 1998-08-30 21:21:22 +02:00 committed by Jeff Law
parent e916423b59
commit 9862dea924
3 changed files with 13 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
Sun Aug 30 20:19:43 1998 Hans-Peter Nilsson <hp@axis.se>
* expr.c (expand_expr): Change ">" to ">=" making MOVE_RATIO use
consistent.
* tm.texi (Costs): Say MOVE_RATIO is number of mem-mem move
*sequences* *below* which scalar moves will be used.
Sun Aug 30 17:18:43 1998 Jeffrey A Law (law@cygnus.com)
* collect2.c (mktemp): Delete unused declaration.

2
gcc/expr.c
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@ -5889,7 +5889,7 @@ expand_expr (exp, target, tmode, modifier)
&& (move_by_pieces_ninsns
(TREE_INT_CST_LOW (TYPE_SIZE (type))/BITS_PER_UNIT,
TYPE_ALIGN (type) / BITS_PER_UNIT)
> MOVE_RATIO)
>= MOVE_RATIO)
&& ! mostly_zeros_p (exp))))
|| (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp)))
{

6
gcc/tm.texi
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@ -4727,10 +4727,14 @@ than good.)
@findex MOVE_RATIO
@item MOVE_RATIO
The number of scalar move insns which should be generated instead of a
The threshold of number of scalar memory-to-memory move insns, @emph{below}
which a sequence of insns should be generated instead of a
string move insn or a library call. Increasing the value will always
make code faster, but eventually incurs high cost in increased code size.
Note that on machines with no memory-to-memory move insns, this macro denotes
the corresponding number of memory-to-memory @emph{sequences}.
If you don't define this, a reasonable default is used.
@findex NO_FUNCTION_CSE