------- Comment #8 from pranav dot bhandarkar at gmail dot com 2007-08-24
13:28 -------
Created an attachment (id=14102)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14102&action=view)
Another testcase displaying the said behaviour
IMHO, the code generated for the following can benefit from Strength reduction.
It will be possible to generate post_inc due to strength reduction.
for (dp = i = 0; i < c; i++) {
dp += a[i] * b[i];
}
The RTL code generated for the loop is of the form ( numbers represent pseudo
reg numbers)
137 and 136 hold the base addresses of the two arrays before entry into the
loop.
132 = 0 ; #i,
133 = 132 ; #dp
Label:
139 = *(137 + 132)
140 = *(136 + 132)
141 = 140 * 139
133 += 141 ;#dp
132 += 2
conditional_jump back to Label.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283
