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fold-const.c (fold): Even with otherwise constant trees...

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* fold-const.c (fold): Even with otherwise constant trees, look for
        opportunities to combine integer constants.

From-SVN: r20392
This commit is contained in:
Richard Henderson 1998-06-09 15:05:49 -07:00 committed by Richard Henderson
parent 1c5d60f501
commit ac1fdb22b8
2 changed files with 22 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Tue Jun 9 22:05:34 1998 Richard Henderson <rth@cygnus.com>
* fold-const.c (fold): Even with otherwise constant trees, look for
opportunities to combine integer constants.
Wed Jun 3 23:41:24 EDT 1998 John Wehle (john@feith.com)
* i386.md (movsfcc, movdfcc, movxfcc): The floating point

22
gcc/fold-const.c
View File

@ -4433,9 +4433,12 @@ fold (expr)
return convert (TREE_TYPE (t), con);
/* If ARG0 is a constant, don't change things around;
instead keep all the constant computations together. */
instead keep all the constant computations together.
Notice, however, if we can merge integer constants. */
if (TREE_CONSTANT (arg0))
if (TREE_CONSTANT (arg0)
&& !(TREE_CODE (con) == INTEGER_CST
&& TREE_CODE (arg1) == INTEGER_CST))
return t;
/* Otherwise return (CON +- ARG1) - VAR. */
@ -4450,9 +4453,12 @@ fold (expr)
return convert (TREE_TYPE (t), con);
/* If ARG0 is a constant, don't change things around;
instead keep all the constant computations together. */
instead keep all the constant computations together.
Notice, however, if we can merge integer constants. */
if (TREE_CONSTANT (arg0))
if (TREE_CONSTANT (arg0)
&& !(TREE_CODE (con) == INTEGER_CST
&& TREE_CODE (arg1) == INTEGER_CST))
return t;
/* Otherwise return VAR +- (ARG1 +- CON). */
@ -4481,7 +4487,13 @@ fold (expr)
if (split_tree (arg1, code, &var, &con, &varsign))
{
if (TREE_CONSTANT (arg1))
/* If ARG1 is a constant, don't change things around;
instead keep all the constant computations together.
Notice, however, if we can merge integer constants. */
if (TREE_CONSTANT (arg1)
&& !(TREE_CODE (con) == INTEGER_CST
&& TREE_CODE (arg0) == INTEGER_CST))
return t;
if (varsign == -1)