diff options
author | Andy Polyakov <appro@openssl.org> | 2001-05-28 20:02:51 +0000 |
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committer | Andy Polyakov <appro@openssl.org> | 2001-05-28 20:02:51 +0000 |
commit | 4cb73bf8e49113a843a1499cc9111011f1552dec (patch) | |
tree | 67b56df726f19c55100330c8b9ae7fbac2f85c61 | |
parent | 79bb8d0077b7b2d86658b7321d550d5e93d351d3 (diff) |
Assembler support for IA-64. See the source code commentary for further
details (performance numbers and accompanying discussions:-). Note that
the code is not engaged in ./Configure yet. I'll add it later this week
along with updates for .spec file.
Submitted by:
Reviewed by:
PR:
-rw-r--r-- | crypto/bn/asm/ia64.S | 1484 |
1 files changed, 1484 insertions, 0 deletions
diff --git a/crypto/bn/asm/ia64.S b/crypto/bn/asm/ia64.S new file mode 100644 index 0000000000..c7eaaa7e6c --- /dev/null +++ b/crypto/bn/asm/ia64.S @@ -0,0 +1,1484 @@ +.text +.asciz "ia64.S, Version 1.0" +.asciz "IA-64 ISA artwork by Andy Polyakov <appro@fy.chalmers.se>" + +// +// ==================================================================== +// Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL +// project. +// +// Rights for redistribution and usage in source and binary forms are +// granted according to the OpenSSL license. Warranty of any kind is +// disclaimed. +// ==================================================================== +// + +// Q. How much faster does it get? +// A. Here is the output from 'openssl speed rsa dsa' for vanilla +// 0.9.6a compiled with gcc version 2.96 20000731 (Red Hat +// Linux 7.1 2.96-81): +// +// sign verify sign/s verify/s +// rsa 512 bits 0.0036s 0.0003s 275.3 2999.2 +// rsa 1024 bits 0.0203s 0.0011s 49.3 894.1 +// rsa 2048 bits 0.1331s 0.0040s 7.5 250.9 +// rsa 4096 bits 0.9270s 0.0147s 1.1 68.1 +// sign verify sign/s verify/s +// dsa 512 bits 0.0035s 0.0043s 288.3 234.8 +// dsa 1024 bits 0.0111s 0.0135s 90.0 74.2 +// +// And here is similar output but for this assembler +// implementation:-) +// +// sign verify sign/s verify/s +// rsa 512 bits 0.0021s 0.0001s 549.4 9638.5 +// rsa 1024 bits 0.0055s 0.0002s 183.8 4481.1 +// rsa 2048 bits 0.0244s 0.0006s 41.4 1726.3 +// rsa 4096 bits 0.1295s 0.0018s 7.7 561.5 +// sign verify sign/s verify/s +// dsa 512 bits 0.0012s 0.0013s 891.9 756.6 +// dsa 1024 bits 0.0023s 0.0028s 440.4 376.2 +// +// Yes, you may argue that it's not fair comparison as it's +// possible to craft the C implementation with BN_UMULT_HIGH +// inline assembler macro. But of course! Here is the output +// with the macro: +// +// sign verify sign/s verify/s +// rsa 512 bits 0.0020s 0.0002s 495.0 6561.0 +// rsa 1024 bits 0.0086s 0.0004s 116.2 2235.7 +// rsa 2048 bits 0.0519s 0.0015s 19.3 667.3 +// rsa 4096 bits 0.3464s 0.0053s 2.9 187.7 +// sign verify sign/s verify/s +// dsa 512 bits 0.0016s 0.0020s 613.1 510.5 +// dsa 1024 bits 0.0045s 0.0054s 221.0 183.9 +// +// My code is still way faster, huh:-) And I believe that even +// higher performance can be achieved. Note that as keys get +// longer, performance gain is larger. Why? According to the +// profiler there is another player in the field, namely +// BN_from_montgomery consuming larger and larger portion of CPU +// time as keysize decreases. I therefore consider putting effort +// to assembler implementation of the following routine: +// +// void bn_mul_add_mont (BN_ULONG *rp,BN_ULONG *np,int nl,BN_ULONG n0) +// { +// int i,j; +// BN_ULONG v; +// +// for (i=0; i<nl; i++) +// { +// v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2); +// nrp++; +// rp++; +// if (((nrp[-1]+=v)&BN_MASK2) < v) +// for (j=0; ((++nrp[j])&BN_MASK2) == 0; j++) ; +// } +// } +// +// It might as well be beneficial to implement even combaX +// variants, as it appears as it can literally unleash the +// performance (see comment section to bn_mul_comba8 below). +// +// And finally for your reference the output for 0.9.6a compiled +// with SGIcc version 0.01.0-12 (keep in mind that for the moment +// of this writing it's not possible to convince SGIcc to use +// BN_UMULT_HIGH inline assembler macro, yet the code is fast, +// i.e. for a compiler generated one:-): +// +// sign verify sign/s verify/s +// rsa 512 bits 0.0022s 0.0002s 452.7 5894.3 +// rsa 1024 bits 0.0097s 0.0005s 102.7 2002.9 +// rsa 2048 bits 0.0578s 0.0017s 17.3 600.2 +// rsa 4096 bits 0.3838s 0.0061s 2.6 164.5 +// sign verify sign/s verify/s +// dsa 512 bits 0.0018s 0.0022s 547.3 459.6 +// dsa 1024 bits 0.0051s 0.0062s 196.6 161.3 +// +// Oh! Benchmarks were performed on 733MHz Lion-class Itanium +// system running Redhat Linux 7.1 (very special thanks to Ray +// McCaffity of Williams Communications for providing an account). +// +// Q. What's the heck with 'rum 1<<5' at the end of every function? +// A. Well, by clearing the "upper FP registers written" bit of the +// User Mask I want to excuse the kernel from preserving upper +// (f32-f128) FP register bank over process context switch, thus +// minimizing bus bandwidth consumption during the switch (i.e. +// after PKI opration completes and the program is off doing +// something else like bulk symmetric encryption). Having said +// this, I also want to point out that it might be good idea +// to compile the whole toolkit (as well as majority of the +// programs for that matter) with -mfixed-range=f32-f127 command +// line option. No, it doesn't prevent the compiler from writing +// to upper bank, but at least discourages to do so. If you don't +// like the idea you have the option to compile the module with +// -Drum=nop.m in command line. +// + +#if 1 +// +// bn_[add|sub]_words routines. +// +// Loops are spinning in 2*(n+5) ticks on Itanuim (provided that the +// data reside in L1 cache, i.e. 2 ticks away). It's possible to +// compress the epilogue and get down to 2*n+6, but at the cost of +// scalability (the neat feature of this implementation is that it +// shall automagically spin in n+5 on "wider" IA-64 implementations:-) +// I consider that the epilogue is short enough as it is to trade tiny +// performance loss on Itanium for scalability. +// +// BN_ULONG bn_add_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp,int num) +// +.global bn_add_words# +.proc bn_add_words# +.align 64 +.space 32 // makes the loop body aligned at 64-byte boundary +bn_add_words: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,4,12,0,16 + cmp4.le p6,p0=r35,r0 };; +{ .mfb mov r8=r0 // return value +(p6) br.ret.spnt.many b0 };; + + .save ar.lc,r3 +{ .mib sub r10=r35,r0,1 + mov r3=ar.lc + brp.loop.imp .L_bn_add_words_ctop,.L_bn_add_words_cend-16 + } + .body +{ .mib mov r14=r32 // rp + mov r9=pr };; +{ .mii mov r15=r33 // ap + mov ar.lc=r10 + mov ar.ec=6 } +{ .mib mov r16=r34 // bp + mov pr.rot=1<<16 } + +.L_bn_add_words_ctop: ;; +{ .mii (p16) ld8 r32=[r16],8 // b=*(bp++) + (p18) add r39=r37,r34 + (p19) cmp.ltu.unc p56,p0=r40,r38 } +{ .mfb (p0) nop.m 0x0 + (p0) nop.f 0x0 + (p0) nop.b 0x0 } +{ .mii (p16) ld8 r35=[r15],8 // a=*(ap++) + (p58) cmp.eq.or p57,p0=-1,r41 // (p20) + (p58) add r41=1,r41 } // (p20) +{ .mfb (p21) st8 [r14]=r42,8 // *(rp++)=r + (p0) nop.f 0x0 + br.ctop.sptk .L_bn_add_words_ctop };; +.L_bn_add_words_cend: + +{ .mii +(p59) add r8=1,r8 // return value + mov pr=r9,-1 + mov ar.lc=r3 } +{ .mbb nop.b 0x0 + br.ret.sptk.many b0 };; +.endp bn_add_words# + +// +// BN_ULONG bn_sub_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp,int num) +// +.global bn_sub_words# +.proc bn_sub_words# +.align 64 +.space 32 // makes the loop body aligned at 64-byte boundary +bn_sub_words: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,4,12,0,16 + cmp4.le p6,p0=r35,r0 };; +{ .mfb mov r8=r0 // return value +(p6) br.ret.spnt.many b0 };; + + .save ar.lc,r3 +{ .mib sub r10=r35,r0,1 + mov r3=ar.lc + brp.loop.imp .L_bn_sub_words_ctop,.L_bn_sub_words_cend-16 + } + .body +{ .mib mov r14=r32 // rp + mov r9=pr };; +{ .mii mov r15=r33 // ap + mov ar.lc=r10 + mov ar.ec=6 } +{ .mib mov r16=r34 // bp + mov pr.rot=1<<16 } + +.L_bn_sub_words_ctop: ;; +{ .mii (p16) ld8 r32=[r16],8 // b=*(bp++) + (p18) sub r39=r37,r34 + (p19) cmp.gtu.unc p56,p0=r40,r38 } +{ .mfb (p0) nop.m 0x0 + (p0) nop.f 0x0 + (p0) nop.b 0x0 } +{ .mii (p16) ld8 r35=[r15],8 // a=*(ap++) + (p58) cmp.eq.or p57,p0=0,r41 // (p20) + (p58) add r41=-1,r41 } // (p20) +{ .mbb (p21) st8 [r14]=r42,8 // *(rp++)=r + (p0) nop.b 0x0 + br.ctop.sptk .L_bn_sub_words_ctop };; +.L_bn_sub_words_cend: + +{ .mii +(p59) add r8=1,r8 // return value + mov pr=r9,-1 + mov ar.lc=r3 } +{ .mbb nop.b 0x0 + br.ret.sptk.many b0 };; +.endp bn_sub_words# +#endif + +#if 0 +#define XMA_TEMPTATION +#endif + +#if 1 +// +// BN_ULONG bn_mul_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w) +// +.global bn_mul_words# +.proc bn_mul_words# +.align 64 +.space 32 // makes the loop body aligned at 64-byte boundary +bn_mul_words: + .prologue + .fframe 0 + .save ar.pfs,r2 +#ifdef XMA_TEMPTATION +{ .mfi alloc r2=ar.pfs,4,0,0,0 };; +#else +{ .mfi alloc r2=ar.pfs,4,4,0,8 };; +#endif +{ .mib mov r8=r0 // return value + cmp4.le p6,p0=r34,r0 +(p6) br.ret.spnt.many b0 };; + + .save ar.lc,r3 +{ .mii sub r10=r34,r0,1 + mov r3=ar.lc + mov r9=pr };; + + .body +{ .mib setf.sig f8=r35 // w + mov pr.rot=0x400001<<16 + // ------^----- serves as (p48) at first (p26) + brp.loop.imp .L_bn_mul_words_ctop,.L_bn_mul_words_cend-16 + } + +#ifndef XMA_TEMPTATION + +{ .mii mov r14=r32 // rp + mov r15=r33 // ap + mov ar.lc=r10 } +{ .mii mov r39=0 // serves as r33 at first (p26) + mov ar.ec=12 } + +// This loop spins in 2*(n+11) ticks. It's scheduled for data in L2 +// cache (i.e. 9 ticks away) as floating point load/store instructions +// bypass L1 cache and L2 latency is actually best-case scenario for +// ldf8. The loop is not scalable and shall run in 2*(n+11) even on +// "wider" IA-64 implementations. It's a trade-off here. n+22 loop +// would give us ~5% in *overall* performance improvement on "wider" +// IA-64, but would hurt Itanium for about same because of longer +// epilogue. As it's a matter of few percents in either case I've +// chosen to trade the scalability for development time (you can see +// this very instruction sequence in bn_mul_add_words loop which in +// turn is scalable). +.L_bn_mul_words_ctop: ;; +{ .mfi (p25) getf.sig r36=f49 // low + (p21) xmpy.lu f45=f37,f8 + (p27) cmp.ltu p52,p48=r39,r38 } +{ .mfi (p16) ldf8 f32=[r15],8 + (p21) xmpy.hu f38=f37,f8 + (p0) nop.i 0x0 };; +{ .mii (p26) getf.sig r32=f43 // high + (p48) add r38=r37,r33 // (p26) + (p52) add r38=r37,r33,1 } // (p26) +{ .mfb (p27) st8 [r14]=r39,8 + (p0) nop.f 0x0 + br.ctop.sptk .L_bn_mul_words_ctop };; +.L_bn_mul_words_cend: + +{ .mii nop.m 0x0 +(p49) add r8=r34,r0 +(p53) add r8=r34,r0,1 } +{ .mfb nop.m 0x0 + nop.f 0x0 + nop.b 0x0 } + +#else // XMA_TEMPTATION + + setf.sig f37=r0 // serves as carry at (p18) tick + mov ar.lc=r10 + mov ar.ec=5 + +// Most of you examining this code very likely wonder why in the name +// of Intel the following loop is commented out? Indeed, it looks so +// neat that you find it hard to believe that it's something wrong +// with it, right? The catch is that every iteration depends on the +// result from previous one and the latter isn't available instantly. +// The loop therefore spins at the latency of xma minus 1, or in other +// words at 6*(n+4) ticks:-( Compare to the "production" loop above +// that runs in 2*(n+11) where the low latency problem is worked around +// by moving the dependency to one-tick latent interger ALU. Note that +// "distance" between ldf8 and xma is not latency of ldf8, but the +// *difference* between xma and ldf8 latencies. +.L_bn_mul_words_ctop: ;; +{ .mfi (p16) ldf8 f32=[r33],8 + (p18) xma.hu f38=f34,f8,f39 } +{ .mfb (p20) stf8 [r32]=f37,8 + (p18) xma.lu f35=f34,f8,f39 + br.ctop.sptk .L_bn_mul_words_ctop };; +.L_bn_mul_words_cend: + + getf.sig r8=f41 // the return value + +#endif // XMA_TEMPTATION + +{ .mii nop.m 0x0 + mov pr=r9,-1 + mov ar.lc=r3 } +{ .mfb rum 1<<5 // clear um.mfh + nop.f 0x0 + br.ret.sptk.many b0 };; +.endp bn_mul_words# +#endif + +#if 1 +// +// BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w) +// +.global bn_mul_add_words# +.proc bn_mul_add_words# +.align 64 +//.space 0 // makes the loop split at 64-byte boundary +bn_mul_add_words: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,4,12,0,16 + cmp4.le p6,p0=r34,r0 };; +{ .mfb mov r8=r0 // return value +(p6) br.ret.spnt.many b0 };; + + .save ar.lc,r3 +{ .mii sub r10=r34,r0,1 + mov r3=ar.lc + mov r9=pr };; + + .body +{ .mib setf.sig f8=r35 // w + mov pr.rot=0x400001<<16 + // ------^----- serves as (p48) at first (p26) + brp.loop.imp .L_bn_mul_add_words_ctop,.L_bn_mul_add_words_cend-16 + } +{ .mii mov r14=r32 // rp + mov r15=r33 // ap + mov ar.lc=r10 } +{ .mii mov r39=0 // serves as r33 at first (p26) + mov r18=r32 // rp copy + mov ar.ec=14 } + +// This loop spins in 3*(n+13) ticks on Itanium and should spin in +// 2*(n+13) on "wider" IA-64 implementations (to be verified with new +// µ-architecture manuals as they become available). As usual it's +// possible to compress the epilogue, down to 10 in this case, at the +// cost of scalability. Compressed (and therefore non-scalable) loop +// running at 3*(n+10) would buy you ~10% on Itanium but take ~35% +// from "wider" IA-64 so let it be scalable! Special attention was +// paid for having the loop body split at 64-byte boundary. ld8 is +// scheduled for L1 cache as the data is more than likely there. +// Indeed, bn_mul_words has put it there a moment ago:-) +.L_bn_mul_add_words_ctop: ;; +{ .mfi (p25) getf.sig r36=f49 // low + (p21) xmpy.lu f45=f37,f8 + (p27) cmp.ltu p52,p48=r39,r38 } +{ .mfi (p16) ldf8 f32=[r15],8 + (p21) xmpy.hu f38=f37,f8 + (p27) add r43=r43,r39 };; +{ .mii (p26) getf.sig r32=f43 // high + (p48) add r38=r37,r33 // (p26) + (p52) add r38=r37,r33,1 } // (p26) +{ .mfb (p27) cmp.ltu.unc p56,p0=r43,r39 + (p0) nop.f 0x0 + (p0) nop.b 0x0 } +{ .mii (p26) ld8 r42=[r18],8 + (p58) cmp.eq.or p57,p0=-1,r44 + (p58) add r44=1,r44 } +{ .mfb (p29) st8 [r14]=r45,8 + (p0) nop.f 0x0 + br.ctop.sptk .L_bn_mul_add_words_ctop};; +.L_bn_mul_add_words_cend: + +{ .mii nop.m 0x0 +(p51) add r8=r36,r0 +(p55) add r8=r36,r0,1 } +{ .mfb nop.m 0x0 + nop.f 0x0 + nop.b 0x0 };; +{ .mii +(p59) add r8=1,r8 + mov pr=r9,-1 + mov ar.lc=r3 } +{ .mfb rum 1<<5 // clear um.mfh + nop.f 0x0 + br.ret.sptk.many b0 };; +.endp bn_mul_add_words# +#endif + +#if 1 +// +// void bn_sqr_words(BN_ULONG *rp, BN_ULONG *ap, int num) +// +.global bn_sqr_words# +.proc bn_sqr_words# +.align 64 +.space 32 // makes the loop body aligned at 64-byte boundary +bn_sqr_words: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,3,0,0,0 + sxt4 r34=r34 };; +{ .mii cmp.le p6,p0=r34,r0 + mov r8=r0 } // return value +{ .mfb nop.f 0x0 +(p6) br.ret.spnt.many b0 };; + + .save ar.lc,r3 +{ .mii sub r10=r34,r0,1 + mov r3=ar.lc + mov r9=pr };; + + .body +{ .mib + mov pr.rot=1<<16 + brp.loop.imp .L_bn_sqr_words_ctop,.L_bn_sqr_words_cend-16 + } +{ .mii add r34=8,r32 + mov ar.lc=r10 + mov ar.ec=18 } + +// 2*(n+17) on Itanium, (n+17) on "wider" IA-64 implementations. It's +// possible to compress the epilogue (I'm getting tired to write this +// comment over and over) and get down to 2*n+16 at the cost of +// scalability. The decision will very likely be reconsidered after the +// benchmark program is profiled. I.e. if perfomance gain on Itanium +// will appear larger than loss on "wider" IA-64, then the loop should +// be explicitely split and the epilogue compressed. +.L_bn_sqr_words_ctop: ;; +{ .mfi (p16) ldf8 f32=[r33],8 + (p25) xmpy.lu f42=f41,f41 + (p0) nop.i 0x0 } +{ .mib (p33) stf8 [r32]=f50,16 + (p0) nop.i 0x0 + (p0) nop.b 0x0 } +{ .mfi (p0) nop.m 0x0 + (p25) xmpy.hu f52=f41,f41 + (p0) nop.i 0x0 } +{ .mib (p33) stf8 [r34]=f60,16 + (p0) nop.i 0x0 + br.ctop.sptk .L_bn_sqr_words_ctop };; +.L_bn_sqr_words_cend: + +{ .mii nop.m 0x0 + mov pr=r9,-1 + mov ar.lc=r3 } +{ .mfb rum 1<<5 // clear um.mfh + nop.f 0x0 + br.ret.sptk.many b0 };; +.endp bn_sqr_words# +#endif + +#if 1 +// Apparently we win nothing by implementing special bn_mul_comba8. +// Yes, it is possible to reduce the number of multiplications by +// almost factor of two, but then the amount of additions would +// increase by factor of two (as we would have to perform those +// otherwise performed by xma ourselves). Normally we would trade +// anyway as multiplications are way more expensive, but not this +// time... Multiplication kernel is fully pipelined and as we drain +// one 128-bit multiplication result per clock cycle multiplications +// are effectively as inexpensive as additions. Special implementation +// might become of interest for "wider" IA-64 implementation as you'll +// be able to get through the multiplication phase faster (there won't +// be any stall issues as discussed in the commentary section below and +// you therefore will be able to employ all 4 FP units)... But these +// Itanium days it's simply too hard to justify the effort so I just +// drop down to bn_mul_comba8 code:-) +// +// void bn_sqr_comba8(BN_ULONG *r, BN_ULONG *a) +// +.global bn_sqr_comba8# +.proc bn_sqr_comba8# +.align 64 +bn_sqr_comba8: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,2,1,0,0 + mov r34=r33 + add r14=8,r33 };; + .body +{ .mii add r17=8,r34 + add r15=16,r33 + add r18=16,r34 } +{ .mfb add r16=24,r33 + br .L_cheat_entry_point8 };; +#endif + +#if 1 +// I've estimated this routine to run in ~120 ticks, but in reality +// (i.e. according to ar.itc) it takes ~160 ticks. Are those extra +// cycles consumed for instructions fetch? Or did I misinterpret some +// clause in Itanium µ-architecture manual? Comments are welcomed and +// highly appreciated. +// +// However! It should be noted that even 160 ticks is darn good result +// as it's over 10 (yes, ten, spelled as t-e-n) times faster than the +// C version (compiled with gcc with inline assembler). I really +// kicked compiler's butt here, didn't I? Yeah! This brings us to the +// following statement. It's damn shame that this routine isn't called +// very often nowadays! According to the profiler most CPU time is +// consumed by bn_mul_add_words called from BN_from_montgomery. In +// order to estimate what we're missing, I've compared the performance +// of this routine against "traditional" implementation, i.e. against +// following routine: +// +// void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b) +// { r[ 8]=bn_mul_words( &(r[0]),a,8,b[0]); +// r[ 9]=bn_mul_add_words(&(r[1]),a,8,b[1]); +// r[10]=bn_mul_add_words(&(r[2]),a,8,b[2]); +// r[11]=bn_mul_add_words(&(r[3]),a,8,b[3]); +// r[12]=bn_mul_add_words(&(r[4]),a,8,b[4]); +// r[13]=bn_mul_add_words(&(r[5]),a,8,b[5]); +// r[14]=bn_mul_add_words(&(r[6]),a,8,b[6]); +// r[15]=bn_mul_add_words(&(r[7]),a,8,b[7]); +// } +// +// The one below is over 8 times faster than the one above:-( Even +// more reasons to "combafy" bn_mul_add_mont... +// +// And yes, this routine really made me wish there were an optimizing +// assembler! It also feels like it deserves a dedication. +// +// To my wife for being there and to my kids... +// +// void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b) +// +#define carry1 r14 +#define carry2 r15 +#define carry3 r34 +.global bn_mul_comba8# +.proc bn_mul_comba8# +.align 64 +bn_mul_comba8: + .prologue + .fframe 0 + .save ar.pfs,r2 +{ .mii alloc r2=ar.pfs,3,0,0,0 + add r14=8,r33 + add r17=8,r34 } + .body +{ .mii add r15=16,r33 + add r18=16,r34 + add r16=24,r33 };; +.L_cheat_entry_point8: +{ .mmi add r19=24,r34 + + ldf8 f32=[r33],32 } + +{ .mmi ldf8 f120=[r34],32 + ldf8 f121=[r17],32 };; +{ .mmi ldf8 f122=[r18],32 + ldf8 f123=[r19],32 } +{ .mmi ldf8 f124=[r34] + ldf8 f125=[r17] } +{ .mmi ldf8 f126=[r18] + ldf8 f127=[r19] } + +{ .mmi ldf8 f33=[r14],32 + ldf8 f34=[r15],32 } +{ .mmi ldf8 f35=[r16],32 + ldf8 f36=[r33] } +{ .mmi ldf8 f37=[r14] + ldf8 f38=[r15] } +{ .mfi ldf8 f39=[r16] +// -------\ Entering multiplier's heaven /------- +// ------------\ /------------ +// -----------------\ /----------------- +// ----------------------\/---------------------- + xma.hu f41=f32,f120,f0 } +{ .mfi xma.lu f40=f32,f120,f0 };; // (*) +{ .mfi xma.hu f51=f32,f121,f0 } +{ .mfi xma.lu f50=f32,f121,f0 };; +{ .mfi xma.hu f61=f32,f122,f0 } +{ .mfi xma.lu f60=f32,f122,f0 };; +{ .mfi xma.hu f71=f32,f123,f0 } +{ .mfi xma.lu f70=f32,f123,f0 };; +{ .mfi xma.hu f81=f32,f124,f0 } +{ .mfi xma.lu f80=f32,f124,f0 };; +{ .mfi xma.hu f91=f32,f125,f0 } +{ .mfi xma.lu f90=f32,f125,f0 };; +{ .mfi xma.hu f101=f32,f126,f0 } +{ .mfi xma.lu f100=f32,f126,f0 };; +{ .mfi xma.hu f111=f32,f127,f0 } +{ .mfi xma.lu f110=f32,f127,f0 };;;; +// (*) You can argue that splitting at every second bundle would +// prevent "wider" IA-64 implementations from achieving the peak +// performance. Well, not really... The catch is that if you +// intend to keep 4 FP units busy by splitting at every fourth +// bundle and thus perform these 16 multiplications in 4 ticks, +// the first bundle *below* would stall because the result from +// the first xma bundle *above* won't be available for another 3 +// ticks (if not more, being an optimist, I assume that "wider" +// implementation will have same latency:-). This stall will hold +// you back and the performance would be as if every second bundle +// were split *anyway*... +{ .mfi getf.sig r16=f40 + xma.hu f42=f33,f120,f41 + add r33=8,r32 } +{ .mfi xma.lu f41=f33,f120,f41 };; +{ .mfi getf.sig r24=f50 + xma.hu f52=f33,f121,f51 } +{ .mfi xma.lu f51=f33,f121,f51 };; +{ .mfi st8 [r32]=r16,16 + xma.hu f62=f33,f122,f61 } +{ .mfi xma.lu f61=f33,f122,f61 };; +{ .mfi xma.hu f72=f33,f123,f71 } +{ .mfi xma.lu f71=f33,f123,f71 };; +{ .mfi xma.hu f82=f33,f124,f81 } +{ .mfi xma.lu f81=f33,f124,f81 };; +{ .mfi xma.hu f92=f33,f125,f91 } +{ .mfi xma.lu f91=f33,f125,f91 };; +{ .mfi xma.hu f102=f33,f126,f101 } +{ .mfi xma.lu f101=f33,f126,f101 };; +{ .mfi xma.hu f112=f33,f127,f111 } +{ .mfi xma.lu f111=f33,f127,f111 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r25=f41 + xma.hu f43=f34,f120,f42 } +{ .mfi xma.lu f42=f34,f120,f42 };; +{ .mfi getf.sig r16=f60 + xma.hu f53=f34,f121,f52 } +{ .mfi xma.lu f52=f34,f121,f52 };; +{ .mfi getf.sig r17=f51 + xma.hu f63=f34,f122,f62 + add r25=r25,r24 } +{ .mfi xma.lu f62=f34,f122,f62 + mov carry1=0 };; +{ .mfi cmp.ltu p6,p0=r25,r24 + xma.hu f73=f34,f123,f72 } +{ .mfi xma.lu f72=f34,f123,f72 };; +{ .mfi st8 [r33]=r25,16 + xma.hu f83=f34,f124,f82 +(p6) add carry1=1,carry1 } +{ .mfi xma.lu f82=f34,f124,f82 };; +{ .mfi xma.hu f93=f34,f125,f92 } +{ .mfi xma.lu f92=f34,f125,f92 };; +{ .mfi xma.hu f103=f34,f126,f102 } +{ .mfi xma.lu f102=f34,f126,f102 };; +{ .mfi xma.hu f113=f34,f127,f112 } +{ .mfi xma.lu f112=f34,f127,f112 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r18=f42 + xma.hu f44=f35,f120,f43 + add r17=r17,r16 } +{ .mfi xma.lu f43=f35,f120,f43 };; +{ .mfi getf.sig r24=f70 + xma.hu f54=f35,f121,f53 } +{ .mfi mov carry2=0 + xma.lu f53=f35,f121,f53 };; +{ .mfi getf.sig r25=f61 + xma.hu f64=f35,f122,f63 + cmp.ltu p7,p0=r17,r16 } +{ .mfi add r18=r18,r17 + xma.lu f63=f35,f122,f63 };; +{ .mfi getf.sig r26=f52 + xma.hu f74=f35,f123,f73 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r18,r17 + xma.lu f73=f35,f123,f73 + add r18=r18,carry1 };; +{ .mfi + xma.hu f84=f35,f124,f83 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r18,carry1 + xma.lu f83=f35,f124,f83 };; +{ .mfi st8 [r32]=r18,16 + xma.hu f94=f35,f125,f93 +(p7) add carry2=1,carry2 } +{ .mfi xma.lu f93=f35,f125,f93 };; +{ .mfi xma.hu f104=f35,f126,f103 } +{ .mfi xma.lu f103=f35,f126,f103 };; +{ .mfi xma.hu f114=f35,f127,f113 } +{ .mfi mov carry1=0 + xma.lu f113=f35,f127,f113 + add r25=r25,r24 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r27=f43 + xma.hu f45=f36,f120,f44 + cmp.ltu p6,p0=r25,r24 } +{ .mfi xma.lu f44=f36,f120,f44 + add r26=r26,r25 };; +{ .mfi getf.sig r16=f80 + xma.hu f55=f36,f121,f54 +(p6) add carry1=1,carry1 } +{ .mfi xma.lu f54=f36,f121,f54 };; +{ .mfi getf.sig r17=f71 + xma.hu f65=f36,f122,f64 + cmp.ltu p6,p0=r26,r25 } +{ .mfi xma.lu f64=f36,f122,f64 + add r27=r27,r26 };; +{ .mfi getf.sig r18=f62 + xma.hu f75=f36,f123,f74 +(p6) add carry1=1,carry1 } +{ .mfi cmp.ltu p6,p0=r27,r26 + xma.lu f74=f36,f123,f74 + add r27=r27,carry2 };; +{ .mfi getf.sig r19=f53 + xma.hu f85=f36,f124,f84 +(p6) add carry1=1,carry1 } +{ .mfi xma.lu f84=f36,f124,f84 + cmp.ltu p6,p0=r27,carry2 };; +{ .mfi st8 [r33]=r27,16 + xma.hu f95=f36,f125,f94 +(p6) add carry1=1,carry1 } +{ .mfi xma.lu f94=f36,f125,f94 };; +{ .mfi xma.hu f105=f36,f126,f104 } +{ .mfi mov carry2=0 + xma.lu f104=f36,f126,f104 + add r17=r17,r16 };; +{ .mfi xma.hu f115=f36,f127,f114 + cmp.ltu p7,p0=r17,r16 } +{ .mfi xma.lu f114=f36,f127,f114 + add r18=r18,r17 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r20=f44 + xma.hu f46=f37,f120,f45 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r18,r17 + xma.lu f45=f37,f120,f45 + add r19=r19,r18 };; +{ .mfi getf.sig r24=f90 + xma.hu f56=f37,f121,f55 } +{ .mfi xma.lu f55=f37,f121,f55 };; +{ .mfi getf.sig r25=f81 + xma.hu f66=f37,f122,f65 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r19,r18 + xma.lu f65=f37,f122,f65 + add r20=r20,r19 };; +{ .mfi getf.sig r26=f72 + xma.hu f76=f37,f123,f75 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r20,r19 + xma.lu f75=f37,f123,f75 + add r20=r20,carry1 };; +{ .mfi getf.sig r27=f63 + xma.hu f86=f37,f124,f85 +(p7) add carry2=1,carry2 } +{ .mfi xma.lu f85=f37,f124,f85 + cmp.ltu p7,p0=r20,carry1 };; +{ .mfi getf.sig r28=f54 + xma.hu f96=f37,f125,f95 +(p7) add carry2=1,carry2 } +{ .mfi st8 [r32]=r20,16 + xma.lu f95=f37,f125,f95 };; +{ .mfi xma.hu f106=f37,f126,f105 } +{ .mfi mov carry1=0 + xma.lu f105=f37,f126,f105 + add r25=r25,r24 };; +{ .mfi xma.hu f116=f37,f127,f115 + cmp.ltu p6,p0=r25,r24 } +{ .mfi xma.lu f115=f37,f127,f115 + add r26=r26,r25 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r29=f45 + xma.hu f47=f38,f120,f46 +(p6) add carry1=1,carry1 } +{ .mfi cmp.ltu p6,p0=r26,r25 + xma.lu f46=f38,f120,f46 + add r27=r27,r26 };; +{ .mfi getf.sig r16=f100 + xma.hu f57=f38,f121,f56 +(p6) add carry1=1,carry1 } +{ .mfi cmp.ltu p6,p0=r27,r26 + xma.lu f56=f38,f121,f56 + add r28=r28,r27 };; +{ .mfi getf.sig r17=f91 + xma.hu f67=f38,f122,f66 +(p6) add carry1=1,carry1 } +{ .mfi cmp.ltu p6,p0=r28,r27 + xma.lu f66=f38,f122,f66 + add r29=r29,r28 };; +{ .mfi getf.sig r18=f82 + xma.hu f77=f38,f123,f76 +(p6) add carry1=1,carry1 } +{ .mfi cmp.ltu p6,p0=r29,r28 + xma.lu f76=f38,f123,f76 + add r29=r29,carry2 };; +{ .mfi getf.sig r19=f73 + xma.hu f87=f38,f124,f86 +(p6) add carry1=1,carry1 } +{ .mfi xma.lu f86=f38,f124,f86 + cmp.ltu p6,p0=r29,carry2 };; +{ .mfi getf.sig r20=f64 + xma.hu f97=f38,f125,f96 +(p6) add carry1=1,carry1 } +{ .mfi st8 [r33]=r29,16 + xma.lu f96=f38,f125,f96 };; +{ .mfi getf.sig r21=f55 + xma.hu f107=f38,f126,f106 } +{ .mfi mov carry2=0 + xma.lu f106=f38,f126,f106 + add r17=r17,r16 };; +{ .mfi xma.hu f117=f38,f127,f116 + cmp.ltu p7,p0=r17,r16 } +{ .mfi xma.lu f116=f38,f127,f116 + add r18=r18,r17 };;;; +//-------------------------------------------------// +{ .mfi getf.sig r22=f46 + xma.hu f48=f39,f120,f47 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r18,r17 + xma.lu f47=f39,f120,f47 + add r19=r19,r18 };; +{ .mfi getf.sig r24=f110 + xma.hu f58=f39,f121,f57 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r19,r18 + xma.lu f57=f39,f121,f57 + add r20=r20,r19 };; +{ .mfi getf.sig r25=f101 + xma.hu f68=f39,f122,f67 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r20,r19 + xma.lu f67=f39,f122,f67 + add r21=r21,r20 };; +{ .mfi getf.sig r26=f92 + xma.hu f78=f39,f123,f77 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r21,r20 + xma.lu f77=f39,f123,f77 + add r22=r22,r21 };; +{ .mfi getf.sig r27=f83 + xma.hu f88=f39,f124,f87 +(p7) add carry2=1,carry2 } +{ .mfi cmp.ltu p7,p0=r22,r21 + xma.lu f87=f39,f124,f87 + add r22=r22,carry1 };; +{ .mfi getf.sig r28=f74 + xma.hu f98=f39,f125,f97 +(p7) add carry2=1,carry2 } +{ .mfi xma.lu f97=f39,f125,f97 + cmp.ltu p7,p0=r22,carry1 };; +{ .mfi getf.sig r29=f65 + xma.hu f108=f39,f126,f107 +(p7) add carry2=1,carry2 } +{ .mfi st8 [r32]=r22,16 + xma.lu f107=f39,f126,f107 };; +{ .mfi getf.sig r30=f56 + xma.hu f118=f39,f127,f117 } +{ .mfi xma.lu f117=f39,f127,f117 };;;; +//-------------------------------------------------// +// Leaving muliplier's heaven... Quite a ride, huh? + +{ .mii getf.sig r31=f47 + add r25=r25,r24 + mov carry1=0 };; +{ .mii getf.sig r16=f111 + cmp.ltu p6,p0=r25,r24 + add r26=r26,r25 };; +{ .mfb getf.sig r17=f102 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r26,r25 + add r27=r27,r26 };; +{ .mfb nop.m 0x0 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r27,r26 + add r28=r28,r27 };; +{ .mii getf.sig r18=f93 + add r17=r17,r16 + mov carry3=0 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r28,r27 + add r29=r29,r28 };; +{ .mii getf.sig r19=f84 + cmp.ltu p7,p0=r17,r16 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r29,r28 + add r30=r30,r29 };; +{ .mii getf.sig r20=f75 + add r18=r18,r17 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r30,r29 + add r31=r31,r30 };; +{ .mfb getf.sig r21=f66 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r18,r17 + add r19=r19,r18 } +{ .mfb nop.m 0x0 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r31,r30 + add r31=r31,carry2 };; +{ .mfb getf.sig r22=f57 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r19,r18 + add r20=r20,r19 } +{ .mfb nop.m 0x0 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r31,carry2 };; +{ .mfb getf.sig r23=f48 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r20,r19 + add r21=r21,r20 } +{ .mii +(p6) add carry1=1,carry1 } +{ .mfb st8 [r33]=r31,16 };; + +{ .mfb getf.sig r24=f112 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r21,r20 + add r22=r22,r21 };; +{ .mfb getf.sig r25=f103 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r22,r21 + add r23=r23,r22 };; +{ .mfb getf.sig r26=f94 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r23,r22 + add r23=r23,carry1 };; +{ .mfb getf.sig r27=f85 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p8=r23,carry1};; +{ .mii getf.sig r28=f76 + add r25=r25,r24 + mov carry1=0 } +{ .mii st8 [r32]=r23,16 + (p7) add carry2=1,carry3 + (p8) add carry2=0,carry3 };; + +{ .mfb nop.m 0x0 } +{ .mii getf.sig r29=f67 + cmp.ltu p6,p0=r25,r24 + add r26=r26,r25 };; +{ .mfb getf.sig r30=f58 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r26,r25 + add r27=r27,r26 };; +{ .mfb getf.sig r16=f113 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r27,r26 + add r28=r28,r27 };; +{ .mfb getf.sig r17=f104 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r28,r27 + add r29=r29,r28 };; +{ .mfb getf.sig r18=f95 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r29,r28 + add r30=r30,r29 };; +{ .mii getf.sig r19=f86 + add r17=r17,r16 + mov carry3=0 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r30,r29 + add r30=r30,carry2 };; +{ .mii getf.sig r20=f77 + cmp.ltu p7,p0=r17,r16 + add r18=r18,r17 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r30,carry2 };; +{ .mfb getf.sig r21=f68 } +{ .mii st8 [r33]=r30,16 +(p6) add carry1=1,carry1 };; + +{ .mfb getf.sig r24=f114 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r18,r17 + add r19=r19,r18 };; +{ .mfb getf.sig r25=f105 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r19,r18 + add r20=r20,r19 };; +{ .mfb getf.sig r26=f96 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r20,r19 + add r21=r21,r20 };; +{ .mfb getf.sig r27=f87 } +{ .mii (p7) add carry3=1,carry3 + cmp.ltu p7,p0=r21,r20 + add r21=r21,carry1 };; +{ .mib getf.sig r28=f78 + add r25=r25,r24 } +{ .mib (p7) add carry3=1,carry3 + cmp.ltu p7,p8=r21,carry1};; +{ .mii st8 [r32]=r21,16 + (p7) add carry2=1,carry3 + (p8) add carry2=0,carry3 } + +{ .mii mov carry1=0 + cmp.ltu p6,p0=r25,r24 + add r26=r26,r25 };; +{ .mfb getf.sig r16=f115 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r26,r25 + add r27=r27,r26 };; +{ .mfb getf.sig r17=f106 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r27,r26 + add r28=r28,r27 };; +{ .mfb getf.sig r18=f97 } +{ .mii +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r28,r27 + add r28=r28,carry2 };; +{ .mib getf.sig r19=f88 + add r17=r17,r16 } +{ .mib +(p6) add carry1=1,carry1 + cmp.ltu p6,p0=r28,carry2 };; +{ .mii st8 [r33]=r28,16 +(p6) add carry1=1,carry1 } + +{ .mii mov carry2=0 + cmp.ltu p7,p0=r17,r16 + add r18=r18,r17 };; +{ .mfb getf.sig r24=f116 } +{ .mii (p7) add carry2=1,carry2 + cmp.ltu p7,p0=r18,r17 + add r19=r19,r18 };; +{ .mfb getf.sig r25=f107 } +{ .mii (p7) add carry2=1,carry2 + cmp.ltu p7,p0=r19,r18 + add r19=r19,carry1 };; +{ .mfb getf.sig r26=f98 } +{ .mii (p7) add carry2=1,carry2 + cmp.ltu p7,p0=r19,carry1};; +{ .mii st8 [r32]=r19,16 + (p7) add carry2=1 |