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.text .globl bn_mul_mont .type bn_mul_mont,@function bn_mul_mont: lgf %r1,96(%r15) # pull %r1 sla %r1,2 # %r1 to enumerate bytes la %r4,0(%r1,%r4) st %r2,2*4(%r15) cghi %r1,16 # lghi %r2,0 # blr %r14 # if(%r1<16) return 0; tmll %r1,4 bnzr %r14 # if (%r1&1) return 0; stm %r3,%r15,3*4(%r15) lghi %r2,-96-8 # leave room for carry bit lcgr %r7,%r1 # -%r1 lgr %r0,%r15 la %r2,0(%r2,%r15) la %r15,0(%r7,%r2) # alloca st %r0,0(%r15) # back chain sra %r1,3 # restore %r1 la %r4,0(%r7,%r4) # restore %r4 ahi %r1,-1 # adjust %r1 for inner loop lg %r6,0(%r6) # pull n0 rllg %r6,%r6,32 lg %r2,0(%r4) rllg %r2,%r2,32 lg %r9,0(%r3) rllg %r9,%r9,32 mlgr %r8,%r2 # ap[0]*bp[0] lgr %r12,%r8 lgr %r0,%r9 # "tp[0]"*n0 msgr %r0,%r6 lg %r11,0(%r5) # rllg %r11,%r11,32 mlgr %r10,%r0 # np[0]*m1 algr %r11,%r9 # +="tp[0]" lghi %r13,0 alcgr %r13,%r10 la %r7,8(%r0) # j=1 lr %r14,%r1 .align 16 .L1st: lg %r9,0(%r7,%r3) rllg %r9,%r9,32 mlgr %r8,%r2 # ap[j]*bp[0] algr %r9,%r12 lghi %r12,0 alcgr %r12,%r8 lg %r11,0(%r7,%r5) rllg %r11,%r11,32 mlgr %r10,%r0 # np[j]*m1 algr %r11,%r13 lghi %r13,0 alcgr %r10,%r13 # +="tp[j]" algr %r11,%r9 alcgr %r13,%r10 stg %r11,96-8(%r7,%r15) # tp[j-1]= la %r7,8(%r7) # j++ brct %r14,.L1st algr %r13,%r12 lghi %r12,0 alcgr %r12,%r12 # upmost overflow bit stg %r13,96-8(%r7,%r15) stg %r12,96(%r7,%r15) la %r4,8(%r4) # bp++ .Louter: lg %r2,0(%r4) # bp[i] rllg %r2,%r2,32 lg %r9,0(%r3) rllg %r9,%r9,32 mlgr %r8,%r2 # ap[0]*bp[i] alg %r9,96(%r15) # +=tp[0] lghi %r12,0 alcgr %r12,%r8 lgr %r0,%r9 msgr %r0,%r6 # tp[0]*n0 lg %r11,0(%r5) # np[0] rllg %r11,%r11,32 mlgr %r10,%r0 # np[0]*m1 algr %r11,%r9 # +="tp[0]" lghi %r13,0 alcgr %r13,%r10 la %r7,8(%r0) # j=1 lr %r14,%r1 .align 16 .Linner: lg %r9,0(%r7,%r3) rllg %r9,%r9,32 mlgr %r8,%r2 # ap[j]*bp[i] algr %r9,%r12 lghi %r12,0 alcgr %r8,%r12 alg %r9,96(%r7,%r15)# +=tp[j] alcgr %r12,%r8 lg %r11,0(%r7,%r5) rllg %r11,%r11,32 mlgr %r10,%r0 # np[j]*m1 algr %r11,%r13 lghi %r13,0 alcgr %r10,%r13 algr %r11,%r9 # +="tp[j]" alcgr %r13,%r10 stg %r11,96-8(%r7,%r15) # tp[j-1]= la %r7,8(%r7) # j++ brct %r14,.Linner algr %r13,%r12 lghi %r12,0 alcgr %r12,%r12 alg %r13,96(%r7,%r15)# accumulate previous upmost overflow bit lghi %r8,0 alcgr %r12,%r8 # new upmost overflow bit stg %r13,96-8(%r7,%r15) stg %r12,96(%r7,%r15) la %r4,8(%r4) # bp++ cl %r4,120(%r7,%r15) # compare to &bp[num] jne .Louter l %r2,112(%r7,%r15) # reincarnate rp la %r3,96(%r15) ahi %r1,1 # restore %r1, incidentally clears "borrow" la %r7,0(%r0) lr %r14,%r1 .Lsub: lg %r9,0(%r7,%r3) lg %r11,0(%r7,%r5) rllg %r11,%r11,32 slbgr %r9,%r11 stg %r9,0(%r7,%r2) la %r7,8(%r7) brct %r14,.Lsub lghi %r8,0 slbgr %r12,%r8 # handle upmost carry lghi %r13,-1 xgr %r13,%r12 la %r7,0(%r0) lgr %r14,%r1 .Lcopy: lg %r8,96(%r7,%r15) # conditional copy lg %r9,0(%r7,%r2) ngr %r8,%r12 ngr %r9,%r13 ogr %r9,%r8 rllg %r9,%r9,32 stg %r7,96(%r7,%r15) # zap tp stg %r9,0(%r7,%r2) la %r7,8(%r7) brct %r14,.Lcopy la %r1,128(%r7,%r15) lm %r6,%r15,0(%r1) lghi %r2,1 # signal "processed" br %r14 .size bn_mul_mont,.-bn_mul_mont .string "Montgomery Multiplication for s390x, CRYPTOGAMS by <appro@openssl.org>"