From f9029004eeb1deedb91c4133df2e99ed73414830 Mon Sep 17 00:00:00 2001 From: akr Date: Sat, 13 Jul 2013 15:16:23 +0000 Subject: * bignum.c (bary_mul_precheck): Use bary_small_lshift or bary_mul_normal if xl is 1. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41955 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- ChangeLog | 5 +++++ bignum.c | 25 +++++++++++++++++-------- 2 files changed, 22 insertions(+), 8 deletions(-) diff --git a/ChangeLog b/ChangeLog index f92cb39fd2..4c555d39aa 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +Sun Jul 14 00:14:15 2013 Tanaka Akira + + * bignum.c (bary_mul_precheck): Use bary_small_lshift or + bary_mul_normal if xl is 1. + Sat Jul 13 22:58:16 2013 Tanaka Akira * bignum.c (big_shift3): New function. diff --git a/bignum.c b/bignum.c index 856ad99eb1..a20f8369fd 100644 --- a/bignum.c +++ b/bignum.c @@ -1903,14 +1903,23 @@ bary_mul_precheck(BDIGIT **zdsp, size_t *zlp, BDIGIT **xdsp, size_t *xlp, BDIGIT return 1; } - if (xl == 1 && xds[0] == 1) { - MEMCPY(zds, yds, BDIGIT, yl); - MEMZERO(zds + yl, BDIGIT, zl - yl); - return 1; - } - if (yl == 1 && yds[0] == 1) { - MEMCPY(zds, xds, BDIGIT, xl); - MEMZERO(zds + xl, BDIGIT, zl - xl); + if (xl == 1) { + if (xds[0] == 1) { + MEMCPY(zds, yds, BDIGIT, yl); + MEMZERO(zds+yl, BDIGIT, zl-yl); + return 1; + } + if (POW2_P(xds[0])) { + zds[yl] = bary_small_lshift(zds, yds, yl, bitsize(xds[0])-1); + MEMZERO(zds+yl+1, BDIGIT, zl-yl-1); + return 1; + } + if (yl == 1 && yds[0] == 1) { + zds[0] = xds[0]; + MEMZERO(zds+1, BDIGIT, zl-1); + return 1; + } + bary_mul_normal(zds, zl, xds, xl, yds, yl); return 1; } -- cgit v1.2.3