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Transformations to increase parallelism
- From: "Jan Hoogerbrugge" <hoogerbrugge at hotmail dot com>
- To: gcc at gcc dot gnu dot org
- Date: Mon, 21 Jul 2003 15:24:50 +0200
- Subject: Transformations to increase parallelism
- Bcc:
Hi,
Are there optimizations in gcc that increase instruction level parallelism?
For example:
void foo(int *p, int a)
{
a += 2;
p[0] = a;
a += 2;
p[1] = a;
}
compiles to
add a, 2 -> tmp1
store p[0], tmp1
add tmp1, 2 -> tmp2
store p[1], tmp2
However, a more parallel translation would be:
add a, 2 -> tmp1
store p[0], tmp1
add a, 4 -> tmp2
store p[1], tmp2
In this case the two adds and the two stores can be executed in parallel.
Jan
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