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[doc, committed] clarify documentation of cache parameters


Continuing to whack at trivial doc issues in bugzilla....

This patch is for PR 59634, which is to clarify that some cache-related parameters control attributes of the data cache and not the instruction cache.

-Sandra
2018-11-13  Sandra Loosemore  <sandra@codesourcery.com>

	PR middle-end/59634

	gcc/
	* doc/invoke.texi (Optimize Options): Clarify that the
	l1-cache-line-size, l1-cache-size, and l2-cache-size parameters
	apply to data cache size.
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi	(revision 266044)
+++ gcc/doc/invoke.texi	(working copy)
@@ -11164,13 +11164,13 @@ streams being prefetched (see @option{si
 Maximum number of prefetches that can run at the same time.
 
 @item l1-cache-line-size
-The size of cache line in L1 cache, in bytes.
+The size of cache line in L1 data cache, in bytes.
 
 @item l1-cache-size
-The size of L1 cache, in kilobytes.
+The size of L1 data cache, in kilobytes.
 
 @item l2-cache-size
-The size of L2 cache, in kilobytes.
+The size of L2 data cache, in kilobytes.
 
 @item prefetch-dynamic-strides
 Whether the loop array prefetch pass should issue software prefetch hints

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