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Documentation patch for -floop-interchange and -floop-unroll-and-jam.

Message ID 98c60f5c-cd60-3826-6f4c-d8940980e011@moene.org
State New
Headers show
Series Documentation patch for -floop-interchange and -floop-unroll-and-jam. | expand

Commit Message

Toon Moene May 17, 2018, 6:36 p.m. UTC 
The documentation of both options is still inconsistent, in both the 
trunk and the gcc-8 branch.

The following is my suggestion to clear this up (and move 
-floop-unroll-and-jam close to -floop-interchange.

ChangeLog:

2018-05-17  Toon Moene  <toon@moene.org>

	* doc/invoke.texi: Move -floop-unroll-and-jam documentation
	directly after that of -floop-interchange. Indicate that both
	options are enabled by default when specifying -O3.

OK for trunk and gcc-8 ?

Comments

Richard Biener May 18, 2018, 7:28 a.m. UTC | #1 
On Thu, May 17, 2018 at 8:36 PM Toon Moene <toon@moene.org> wrote:

> The documentation of both options is still inconsistent, in both the
> trunk and the gcc-8 branch.

> The following is my suggestion to clear this up (and move
> -floop-unroll-and-jam close to -floop-interchange.

> ChangeLog:

> 2018-05-17  Toon Moene  <toon@moene.org>

>          * doc/invoke.texi: Move -floop-unroll-and-jam documentation
>          directly after that of -floop-interchange. Indicate that both
>          options are enabled by default when specifying -O3.

> OK for trunk and gcc-8 ?

OK.

Richard.


> --
> Toon Moene - e-mail: toon@moene.org - phone: +31 346 214290
> Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
> At home: http://moene.org/~toon/; weather: http://moene.org/~hirlam/
> Progress of GNU Fortran: http://gcc.gnu.org/wiki/GFortran#news
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Patch

Index: invoke.texi
===================================================================
--- invoke.texi	(revision 260287)
+++ invoke.texi	(working copy)
@@ -8866,7 +8866,14 @@ 
     for (int j = 0; j < N; j++)
       c[i][j] = c[i][j] + a[i][k]*b[k][j];
 @end smallexample
+This flag is enabled by default at @option{-O3}.
 
+@item -floop-unroll-and-jam
+@opindex floop-unroll-and-jam
+Apply unroll and jam transformations on feasible loops.  In a loop
+nest this unrolls the outer loop by some factor and fuses the resulting
+multiple inner loops.  This flag is enabled by default at @option{-O3}.
+
 @item -ftree-loop-im
 @opindex ftree-loop-im
 Perform loop invariant motion on trees.  This pass moves only invariants that
@@ -10038,12 +10045,6 @@ 
 Move branches with loop invariant conditions out of the loop, with duplicates
 of the loop on both branches (modified according to result of the condition).
 
-@item -floop-unroll-and-jam
-@opindex floop-unroll-and-jam
-Apply unroll and jam transformations on feasible loops.  In a loop
-nest this unrolls the outer loop by some factor and fuses the resulting
-multiple inner loops.
-
 @item -ffunction-sections
 @itemx -fdata-sections
 @opindex ffunction-sections