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loop.c (express_from): Try harder to unify (* c N) and (* c M) where N and M are constant and N is an... 

* loop.c (express_from): Try harder to unify (* c N) and (* c M)
        where N and M are constant and N is an integer multiple of M.

From-SVN: r28868
This commit is contained in:
Richard Henderson 1999-08-25 11:14:11 -07:00 committed by Richard Henderson
parent 37f26d6499
commit e0485b850c
2 changed files with 29 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Aug 25 11:13:29 1999 Richard Henderson <rth@cygnus.com>
* loop.c (express_from): Try harder to unify (* c N) and (* c M)
where N and M are constant and N is an integer multiple of M.
Wed Aug 25 13:55:47 EDT 1999 Andrew MacLeod <amacleod@cygnus.com>
* sbitmap.h (sbitmap_intersection_of_succs): Add prototype.

24
gcc/loop.c
View File

@ -6842,6 +6842,30 @@ express_from (g1, g2)
}
add = express_from_1 (g1->add_val, g2->add_val, mult);
if (add == NULL_RTX)
{
/* Failed. If we've got a multiplication factor between G1 and G2,
scale G1's addend and try again. */
if (INTVAL (mult) > 1)
{
rtx g1_add_val = g1->add_val;
if (GET_CODE (g1_add_val) == MULT
&& GET_CODE (XEXP (g1_add_val, 1)) == CONST_INT)
{
HOST_WIDE_INT m;
m = INTVAL (mult) * INTVAL (XEXP (g1_add_val, 1));
g1_add_val = gen_rtx_MULT (GET_MODE (g1_add_val),
XEXP (g1_add_val, 0), GEN_INT (m));
}
else
{
g1_add_val = gen_rtx_MULT (GET_MODE (g1_add_val), g1_add_val,
mult);
}
add = express_from_1 (g1_add_val, g2->add_val, const1_rtx);
}
}
if (add == NULL_RTX)
return NULL_RTX;