In compiler theory, loop interchange is the process of exchanging the order of two iteration variables used by a nested loop. The variable used in the inner loop switches to the outer loop, and vice versa. It is often done to ensure that the elements of a multi-dimensional array are accessed in the order in which they are present in memory, improving locality of reference.
For example, in the code fragment:
for j from 0 to 20
for i from 0 to 10
a[i,j] = i + j
loop interchange would result in:
for i from 0 to 10
for j from 0 to 20
a[i,j] = i + j
On occasion, such a transformation may create opportunities to further optimize, such as automatic vectorization of the array assignments.
theory, loopinterchange is the process of exchanging the order of two iteration variables used by a nested loop. The variable used in the inner loop switches...
10 then passed under the QEW. The interchange was further modified between 2008 and 2010 by removing all but one loop ramp, creating a partial cloverleaf/diamond...
optimization is called loop tiling, also known as loop blocking or strip mine and interchange. Loop tiling partitions a loop's iteration space into smaller...
followed by a loop ramp and directional ramp entering the freeway. The on-ramps are in the same configuration as a cloverleaf interchange, but there is...
least-used left-turning ramp is built as a cloverleaf-like 270-degree loop). The stack interchange between I-10 and I-405 is a three-level stack, since the semi-directional...
A diamond interchange is a common type of road junction, used where a controlled-access highway crosses a minor road. The freeway itself is grade-separated...
there to an interchange with Interstate 10 (I-10) in Chandler. The Congressman Ed Pastor Freeway runs from there to I-10 in western Phoenix. Loop 202 was...
as it leaves Somerset, Loop 1604 heads north to an interchange with I-35. The highway heads north after the I-35 interchange to an intersection with...
interchange. After a single-point urban interchange with West Friendly Avenue, the Urban Loop curves north-northeast before coming to an interchange with...
The Springfield Interchange, also known as the Mixing Bowl, is the interchange of Interstate 95, Interstate 395, and Interstate 495 in Springfield, Virginia...
202 (Santan Freeway) Agua Fria Freeway Loop 101 begins as the Agua Fria Freeway at a three-level interchange with I-10 in Tolleson west of Phoenix. From...
Loop 820" and "SE Loop 820". The loop is often considered the most congested road in North Texas, with the interchanges at Rufe Snow Drive, Holiday Lane...
end. The Loop 289 interchange is a cloverleaf between the oneway frontage roads of each highway, and with direct ramps from I-27 south to Loop 289 west...
Inner Loop within the US 1 interchange, to segregate through traffic from southbound I-95 and local traffic for US 1. The stump end of the interchange was...
Downtown Minneapolis. The "Can of Worms" interchange in Duluth, between I-35 and US 53/I-535. The Downtown Loopinterchange of 23 exits, four Interstate Highways...
to another interchange for Route 51 and Loop 202 (second of three junctions with the latter), called the Mini Stack. At this interchange, I‑10 turns...
freeway. Loop 303 currently begins at Van Buren Street, one mile south of I-10 in Goodyear. It becomes a six-lane freeway with a stack interchange at I-10...
Loop 1 continues as a limited-access toll road to the SH 45 North/Loop 1 interchange, spanning 3 miles (4.8 km). Frontage roads flank either side of the...
an array, this loop optimization can (when combined with loopinterchange) eliminate loop-carried dependencies, allowing an inner loop to be parallelized...
Route 120 Loop (SR 120 Loop) before route realignments in 2007. The full loop is approximately 9 miles (14 km) in circumference and has an interchange with...
Airport on the east side of the city. Loop 335 is not currently a continuous freeway. Instead, the highway has interchanges at select junctions and short segments...
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