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md.texi: Mention that a target shouldn't implement vec_widen_(s|u)mul_even/odd pair if...

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2014-01-29  Bingfeng Mei  <bmei@broadcom.com>

	* doc/md.texi: Mention that a target shouldn't implement 
	vec_widen_(s|u)mul_even/odd pair if it is less efficient
	than hi/lo pair.

From-SVN: r207228
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Bingfeng Mei 2014-01-29 10:10:20 +00:00 committed by Bingfeng Mei
parent 3d54b29d70
commit 4a271b7ef0
2 changed files with 8 additions and 1 deletions
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@ -1,3 +1,9 @@
2014-01-29 Bingfeng Mei <bmei@broadcom.com>
* doc/md.texi: Mention that a target shouldn't implement
vec_widen_(s|u)mul_even/odd pair if it is less efficient
than hi/lo pair.
2014-01-29 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/59594

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gcc/doc/md.texi
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@ -4918,7 +4918,8 @@ the output vector (operand 0).
Signed/Unsigned widening multiplication. The two inputs (operands 1 and 2)
are vectors with N signed/unsigned elements of size S@. Multiply the high/low
or even/odd elements of the two vectors, and put the N/2 products of size 2*S
in the output vector (operand 0).
in the output vector (operand 0). A target shouldn't implement even/odd pattern
pair if it is less efficient than lo/hi one.
@cindex @code{vec_widen_ushiftl_hi_@var{m}} instruction pattern
@cindex @code{vec_widen_ushiftl_lo_@var{m}} instruction pattern