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
+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
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