diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b856ca2..8648405 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -6675,7 +6675,9 @@ Graphite loop transformation infrastructure. Perform loop strip mining transformations on loops. Strip mining splits a loop into two nested loops. The outer loop has strides equal to the strip size and the inner loop has strides of the -original loop within a strip. For example, given a loop like: +original loop within a strip. The strip length can be changed +using the @option{loop-block-tile-size} parameter. For example, +given a loop like: @smallexample DO I = 1, N A(I) = A(I) + C @@ -6683,8 +6685,8 @@ ENDDO @end smallexample loop strip mining will transform the loop as if the user had written: @smallexample -DO II = 1, N, 4 - DO I = II, min (II + 3, N) +DO II = 1, N, 51 + DO I = II, min (II + 50, N) A(I) = A(I) + C ENDDO ENDDO @@ -6697,7 +6699,9 @@ enable the Graphite loop transformation infrastructure. @item -floop-block Perform loop blocking transformations on loops. Blocking strip mines each loop in the loop nest such that the memory accesses of the -element loops fit inside caches. For example, given a loop like: +element loops fit inside caches. The strip length can be changed +using the @option{loop-block-tile-size} parameter. For example, given +a loop like: @smallexample DO I = 1, N DO J = 1, M @@ -6707,10 +6711,10 @@ ENDDO @end smallexample loop blocking will transform the loop as if the user had written: @smallexample -DO II = 1, N, 64 - DO JJ = 1, M, 64 - DO I = II, min (II + 63, N) - DO J = JJ, min (JJ + 63, M) +DO II = 1, N, 51 + DO JJ = 1, M, 51 + DO I = II, min (II + 50, N) + DO J = JJ, min (JJ + 50, M) A(J, I) = B(I) + C(J) ENDDO ENDDO @@ -8501,6 +8505,11 @@ To avoid exponential effects in the detection of SCoPs, the functions with more than 100 basic blocks are not handled by the Graphite loop transforms. +@item loop-block-tile-size +The default factor for the loop blocking or strip mining transforms, +enabled with @option{-floop-block} or @option{-floop-strip-mine}, is +51. + @end table @end table |