MEM : ALU ratio

Article: Knights Landing Details
By: Michael S (already5chosen.delete@this.yahoo.com), January 18, 2014 4:57 pm
Room: Moderated Discussions
Stubabe (Stubabe.delete@this.nospam.com) on January 17, 2014 1:42 pm wrote:
> Even simpler explanation. Insufficient PRF read resources could lead to a serious stall during
> co-issue of 2x FMA reg, reg, reg if too few of the registers come from the bypass network
> (pure speculation on my part). If true, it could simply be an overly aggressively applied
> compiler heuristic that favours the reg, reg, [mem] form of the FMA instruction.
>
>
>

Nice theory. I thought in that direction myself. But facts are against us.


void Demo (const double * srcX, const double * srcY, double* __restrict dst, int size)
{
#pragma noprefetch
int i;
// Avoid the code for unaligned
__assume_aligned(srcX, 64);
__assume_aligned(srcY, 64);
__assume_aligned(dst, 64);

for(i = 0; i < size; i++) {
double x = srcX[i];
double y = srcY[i];
dst[i] = ((((x*y)*x)*x))*x;
}
}


KNL compiler output (icl /QxMIC-AVX512 /S /O3):

.B1.4:: ; Preds .B1.4 .B1.3
vmovups zmm0, ZMMWORD PTR [r15+r11*8] ;11.16
vmovups zmm5, ZMMWORD PTR [64+r15+r11*8] ;11.16
vmovups zmm20, ZMMWORD PTR [128+r15+r11*8] ;11.16
vmovups zmm25, ZMMWORD PTR [192+r15+r11*8] ;11.16
vmulpd zmm1, zmm0, ZMMWORD PTR [r14+r11*8] ;13.20
vmulpd zmm16, zmm5, ZMMWORD PTR [64+r14+r11*8] ;13.20
vmulpd zmm21, zmm20, ZMMWORD PTR [128+r14+r11*8] ;13.20
vmulpd zmm26, zmm25, ZMMWORD PTR [192+r14+r11*8] ;13.20
vmulpd zmm2, zmm1, ZMMWORD PTR [r15+r11*8] ;13.23
vmulpd zmm17, zmm16, ZMMWORD PTR [64+r15+r11*8] ;13.23
vmulpd zmm22, zmm21, ZMMWORD PTR [128+r15+r11*8] ;13.23
vmulpd zmm27, zmm26, ZMMWORD PTR [192+r15+r11*8] ;13.23
vmulpd zmm3, zmm2, ZMMWORD PTR [r15+r11*8] ;13.26
vmulpd zmm18, zmm17, ZMMWORD PTR [64+r15+r11*8] ;13.26
vmulpd zmm23, zmm22, ZMMWORD PTR [128+r15+r11*8] ;13.26
vmulpd zmm28, zmm27, ZMMWORD PTR [192+r15+r11*8] ;13.26
vmulpd zmm4, zmm3, ZMMWORD PTR [r15+r11*8] ;13.30
vmovups ZMMWORD PTR [r12+r11*8], zmm4 ;13.5
vmulpd zmm19, zmm18, ZMMWORD PTR [64+r15+r11*8] ;13.30
vmovups ZMMWORD PTR [64+r12+r11*8], zmm19 ;13.5
vmulpd zmm24, zmm23, ZMMWORD PTR [128+r15+r11*8] ;13.30
vmovups ZMMWORD PTR [128+r12+r11*8], zmm24 ;13.5
vmulpd zmm29, zmm28, ZMMWORD PTR [192+r15+r11*8] ;13.30
vmovups ZMMWORD PTR [192+r12+r11*8], zmm29 ;13.5
add r11, 32 ;10.3
cmp r11, rdx ;10.3
jb .B1.4 ; Prob 82% ;10.3


KNC compiler output (icl /Qmic -S -O3):

..B1.4: # Preds ..B1.4 ..B1.3 Latency 89
vmovapd (%r15,%r9,8), %zmm0 #11.16 c1
vmovapd 64(%r15,%r9,8), %zmm5 #11.16 c5
vmovapd 128(%r15,%r9,8), %zmm10 #11.16 c9
vmovapd 192(%r15,%r9,8), %zmm15 #11.16 c13
vmulpd (%r11,%r9,8), %zmm0, %zmm1 #13.20 c17
vmulpd 64(%r11,%r9,8), %zmm5, %zmm6 #13.20 c21
vmulpd 128(%r11,%r9,8), %zmm10, %zmm11 #13.20 c25
vmulpd 192(%r11,%r9,8), %zmm15, %zmm16 #13.20 c29
vmulpd (%r15,%r9,8), %zmm1, %zmm2 #13.23 c33
vmulpd 64(%r15,%r9,8), %zmm6, %zmm7 #13.23 c37
vmulpd 128(%r15,%r9,8), %zmm11, %zmm12 #13.23 c41
vmulpd 192(%r15,%r9,8), %zmm16, %zmm17 #13.23 c45
vmulpd (%r15,%r9,8), %zmm2, %zmm3 #13.26 c49
vmulpd 64(%r15,%r9,8), %zmm7, %zmm8 #13.26 c53
vmulpd 128(%r15,%r9,8), %zmm12, %zmm13 #13.26 c57
vmulpd 192(%r15,%r9,8), %zmm17, %zmm18 #13.26 c61
vmulpd (%r15,%r9,8), %zmm3, %zmm4 #13.30 c65
vmulpd 64(%r15,%r9,8), %zmm8, %zmm9 #13.30 c69
vmulpd 128(%r15,%r9,8), %zmm13, %zmm14 #13.30 c73
vmovaps %zmm4, (%r10,%r9,8) #13.5 c73
vmulpd 192(%r15,%r9,8), %zmm18, %zmm19 #13.30 c77
vmovaps %zmm9, 64(%r10,%r9,8) #13.5 c77
vmovaps %zmm14, 128(%r10,%r9,8) #13.5 c81
vmovaps %zmm19, 192(%r10,%r9,8) #13.5 c85
addq $32, %r9 #10.3 c85
cmpq %r8, %r9 #10.3 c89
jb ..B1.4 # Prob 82% #10.3 c89


Here we have no fma at all and very light pressure on RF read ports (one of two inputs most of the time is coming from pipeline bypass), but compiler still prefers load+op over reg-to-reg.
It's Weird. Broken compiler back end appears to be the only logical explanation.


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      Knights Landing L/S bandwidthNicolas Capens2014/01/04 02:55 PM
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            Knights Landing L/S bandwidthEric Bron2014/01/04 05:20 PM
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                Knights Landing L/S bandwidthEric Bron2014/01/05 03:49 AM
                  Knights Landing L/S bandwidthPatrick Chase2014/01/11 08:13 PM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/13 08:39 PM
                Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:18 PM
                  Knights Landing L/S bandwidthMichael S2014/01/06 04:09 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 05:11 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 05:40 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 05:54 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/08 09:00 AM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/07 03:31 PM
                      Knights Landing L/S bandwidthMichael S2014/01/07 04:17 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 09:55 PM
                          Knights Landing L/S bandwidthMichael S2014/01/08 01:42 AM
                            Knights Landing L/S bandwidthGabriele Svelto2014/01/08 08:30 AM
                              Occam's razorNicolas Capens2014/01/08 02:33 PM
                                Occam's razorGabriele Svelto2014/01/08 02:51 PM
                                  Occam's razorEric Bron2014/01/08 03:28 PM
                                    Occam's razorbakaneko2014/01/09 04:45 AM
                                      Occam's razoranon2014/01/09 05:02 AM
                                        Occam's razorbakaneko2014/01/09 06:24 AM
                                          Occam's razorbakaneko2014/01/09 06:51 AM
                                            Occam's razoranon2014/01/09 07:18 AM
                                          Occam's razoranon2014/01/09 07:16 AM
                                            Occam's razorbakaneko2014/01/09 08:43 AM
                                              Occam's razoranon2014/01/09 09:17 AM
                                                Occam's razorbakaneko2014/01/09 11:12 AM
                                                  Occam's razorEric Bron2014/01/09 11:18 AM
                                                    Occam's razorbakaneko2014/01/09 11:58 AM
                                                  Occam's razoranon2014/01/09 12:35 PM
                                                    Occam's razorbakaneko2014/01/12 10:48 AM
                                                  99.9% not a new extensionNicolas Capens2014/01/10 11:39 AM
                                                    Compiler complexityGabriele Svelto2014/01/11 03:58 AM
                                                      Compiler complexityNicolas Capens2014/01/11 01:20 PM
                                                        Compiler complexityGabriele Svelto2014/01/11 03:17 PM
                                                          Patent pendingNicolas Capens2014/01/14 07:21 PM
                                                    99.9% not a new extensionbakaneko2014/01/12 11:08 AM
                                  L0 data cacheEric Bron2014/01/08 04:52 PM
                                  Occam's razorDavid Kanter2014/01/08 04:53 PM
                                    Occam's razorNicolas Capens2014/01/09 03:07 AM
                                      Occam's razorRicardo B2014/01/09 05:21 AM
                                        Virtually indexed, untaggedNicolas Capens2014/01/10 11:27 AM
                                          Virtually indexed, untaggedGabriele Svelto2014/01/11 04:08 AM
                                            Virtually indexed, untaggedNicolas Capens2014/01/11 09:45 PM
                                              Virtually indexed, untaggedDavid Kanter2014/01/12 02:13 AM
                                                Virtually indexed, untaggedanon2014/01/12 04:02 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 09:55 AM
                                              Virtually indexed, untaggedMichael S2014/01/12 04:09 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 10:47 AM
                                      Occam's razorDavid Kanter2014/01/09 06:42 PM
                                        Occam's razorNicolas Capens2014/01/10 02:22 PM
                                          Occam's razorDavid Kanter2014/01/10 04:06 PM
                                            MEM : ALU ratioNicolas Capens2014/01/11 12:24 AM
                                              MEM : ALU ratioGabriele Svelto2014/01/11 03:47 AM
                                                MEM : ALU ratioEric Bron2014/01/11 04:41 AM
                                                  MEM : ALU ratioEric Bron2014/01/11 05:06 AM
                                                    MEM : ALU ratioDavid Kanter2014/01/11 08:28 PM
                                                      MEM : ALU ratioEric Bron nli2014/01/12 02:54 AM
                                                  MEM : ALU ratioGabriele Svelto2014/01/11 10:15 AM
                                                MEM : ALU ratioNicolas Capens2014/01/14 06:56 PM
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                                                  MEM : ALU ratioanon2014/01/14 08:32 PM
                                                    L0 power costNicolas Capens2014/01/16 02:05 PM
                                                      L0 power costanon2014/01/16 10:01 PM
                                                        L0 power costNicolas Capens2014/01/19 12:30 AM
                                                          Links revealedPaul A. Clayton2014/01/19 04:47 PM
                                                          L0 power costanon2014/01/20 01:19 AM
                                                            L0 power costNicolas Capens2014/01/20 02:49 PM
                                                              L0 power costanon2014/01/21 01:18 AM
                                                                Q.E.D.Nicolas Capens2014/01/21 08:44 PM
                                                                  Q.E.D.anon2014/01/21 09:24 PM
                                                                    Straw manNicolas Capens2014/01/23 11:56 PM
                                                                      Straw mananon2014/01/25 06:46 AM
                                                                        Still waiting for an explanationNicolas Capens2014/01/26 12:19 AM
                                                                          Still waiting for an explanationExophase2014/01/26 01:13 PM
                                                                            Still waiting for an explanationbakaneko2014/01/26 11:52 PM
                                                                  Q.E.D.Ricardo B2014/01/22 06:58 PM
                                                                    Q.E.D.Michael S2014/01/23 04:59 AM
                                                                      L0 entry countNicolas Capens2014/01/24 01:11 AM
                                                                        L0 entry countEric Bron2014/01/24 02:08 AM
                                                                          L0 entry countMichael S2014/01/24 06:18 AM
                                                                            L0 entry countEric Bron2014/01/24 07:15 AM
                                                                              L0 entry countMichael S2014/01/24 08:10 AM
                                                                                L0 entry countEric Bron2014/01/24 08:20 AM
                                                                          L0 entry countNicolas Capens2014/01/24 02:33 PM
                                                                            L0 entry countEric Bron2014/01/24 03:20 PM
                                                                              L0 entry count and L1 read port orthogonalityNicolas Capens2014/01/26 01:14 AM
                                                                                L0 entry count and L1 read port orthogonalityEric Bron2014/01/26 03:49 AM
                                                                    L0 hit rateNicolas Capens2014/01/24 12:49 AM
                                                                      L0 hit rateRicardo B2014/01/24 06:42 AM
                                                                        L0 hit rateExophase2014/01/24 01:37 PM
                                                                          L0 hit rateEric Bron2014/01/24 02:12 PM
                                                                        L0 vs RF powerNicolas Capens2014/01/24 02:43 PM
                                              MEM : ALU ratioDavid Kanter2014/01/11 01:47 PM
                                                MEM : ALU ratioNicolas Capens2014/01/16 09:23 AM
                                                  MEM : ALU ratioStubabe2014/01/17 12:58 PM
                                                    MEM : ALU ratioStubabe2014/01/17 01:42 PM
                                                      MEM : ALU ratioMichael S2014/01/18 04:57 PM
                                                        MEM : ALU ratiobakaneko2014/01/19 12:47 AM
                                                    MEM : ALU ratioNicolas Capens2014/01/20 03:48 PM
                                                      It's called "tunnel vision" (NT)iz2014/01/20 04:36 PM
                                                      MEM : ALU ratioMichael S2014/01/20 04:37 PM
                                                        MEM : ALU ratioStubabe2014/01/21 04:54 PM
                                                        MEM : ALU ratioNicolas Capens2014/01/21 10:07 PM
                                                          MEM : ALU ratioMichael S2014/01/22 08:17 AM
                                                            MEM : ALU ratioNicolas Capens2014/01/24 03:33 PM
                                                      MEM : ALU ratioStubabe2014/01/21 04:32 PM
                                                        MEM : ALU ratioMichael S2014/01/22 08:56 AM
                                                          MEM : ALU ratioStubabe2014/01/23 09:06 AM
                                                            MEM : ALU ratioEric Bron2014/01/23 09:45 AM
                                                              editEric Bron2014/01/23 09:49 AM
                                                            MEM : ALU ratioMichael S2014/01/23 09:58 AM
                                                              MEM : ALU ratioEric Bron2014/01/23 10:29 AM
                                                                MEM : ALU ratioMichael S2014/01/23 10:33 AM
                                                              MEM : ALU ratioStubabe2014/01/24 04:50 AM
                                                MEM : ALU ratiobakaneko2014/01/23 10:36 AM
                                              MEM : ALU ratioNoSpammer2014/01/11 03:39 PM
                                                L1 vs L0 access costNicolas Capens2014/01/16 03:17 PM
                                                  L1 vs L0 access costNoSpammer2014/01/19 01:48 PM
                                                    L1 vs L0 access costdmcq2014/01/22 05:45 AM
                                                      L1 vs L0 access costGabriele Svelto2014/01/22 07:29 AM
                                                        L1 vs L0 access costdmcq2014/01/22 01:33 PM
                                                          L1 vs L0 access costGabriele Svelto2014/01/22 04:33 PM
                                                            L1 vs L0 access costdmcq2014/01/24 04:19 AM
                                                    L1 vs L0 access costNicolas Capens2014/01/24 02:16 AM
                                      Occam's razorPatrick Chase2014/01/13 11:19 AM
                                  Occam's razorNicolas Capens2014/01/09 12:40 AM
                                    Occam's razorGabriele Svelto2014/01/09 02:41 AM
                                      Occam's razorEric Bron2014/01/09 02:54 AM
                                        Occam's razorGabriele Svelto2014/01/09 06:35 AM
                                          Occam's razorEric Bron2014/01/09 07:14 AM
                                            avoiding redundant loadsEric Bron2014/01/09 07:18 AM
                                            AVX2 versionEric Bron2014/01/09 07:32 AM
                                      Occam's razorAmiba Gelos2014/01/09 03:01 AM
                                        Occam's razorEric Bron2014/01/09 03:06 AM
                                          Occam's razorAmiba Gelos2014/01/09 03:43 AM
                                            Occam's razorEric Bron2014/01/09 04:02 AM
                                        L0 access latencyNicolas Capens2014/01/09 04:27 AM
                                          L0 access latencyAmiba Gelos2014/01/09 05:16 AM
                                            compared to L0$ i would say banking is far more likely (NT)Amiba Gelos2014/01/09 05:20 AM
                                            L0 access latencyNicolas Capens2014/01/10 03:20 PM
                                      Occam's razorNicolas Capens2014/01/09 04:19 AM
                                    Occam's razorNoSpammer2014/01/09 12:55 PM
                                      Occam's razorNicolas Capens2014/01/10 03:40 PM
                                        Occam's razorMichael S2014/01/11 10:21 AM
                                        Occam's razorMichael S2014/01/12 03:21 PM
                                          KNC compiler outputNicolas Capens2014/01/16 06:39 PM
                                            KNC compiler outputMichael S2014/01/18 05:13 PM
                                    L0 cache coherencyDavid Kanter2014/01/11 08:39 PM
                                Occam's razoranon2014/01/09 05:12 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 10:46 AM
                              Knights Landing L/S bandwidthMichael S2014/01/08 11:23 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 02:02 PM
                              Knights Landing L/S bandwidthMichael S2014/01/08 02:29 PM
                                Knights Landing L/S bandwidthEric Bron2014/01/08 02:54 PM
                                  Knights Landing L/S bandwidthMichael S2014/01/08 03:00 PM
                                    Knights Landing L/S bandwidthEric Bron2014/01/08 03:13 PM
                                      Knights Landing L/S bandwidthMichael S2014/01/08 03:28 PM
                                        Knights Landing L/S bandwidthEric Bron2014/01/08 03:32 PM
                                          Knights Landing L/S bandwidthMichael S2014/01/08 03:40 PM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 03:51 PM
                                              Knights Landing L/S bandwidthMichael S2014/01/09 12:18 PM
                          Knights Landing L/S bandwidthPatrick Chase2014/01/12 10:03 PM
                            Also page/line splits?David Kanter2014/01/12 10:50 PM
                              Also page/line splits?anon2014/01/13 01:44 AM
                                Also page/line splits?none2014/01/13 03:09 AM
                                  Also page/line splits?anon2014/01/13 04:19 AM
                            Knights Landing L/S bandwidthExophase2014/01/13 12:15 AM
                            Knights Landing L/S bandwidthanon2014/01/13 01:41 AM
                              Knights Landing L/S bandwidthPatrick Chase2014/01/13 11:14 AM
                            Aliased writesNicolas Capens2014/01/14 09:46 PM
                      Knights Landing L/S bandwidthRicardo B2014/01/07 04:27 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 10:28 PM
                          Knights Landing L/S bandwidthRicardo B2014/01/08 02:13 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 11:10 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 03:31 PM
                              Knights Landing L/S bandwidthRicardo B2014/01/08 03:58 PM
                                Knights Landing L/S bandwidthG. Gouvine2014/01/09 09:10 AM
                                  Knights Landing L/S bandwidthRicardo B2014/01/09 11:19 AM
                                    Efficient load queue vs. efficient L0 cacheNicolas Capens2014/01/11 12:28 PM
                                      Efficient load queue vs. efficient L0 cacheG. Gouvine2014/01/13 02:11 AM
                                        Efficient load queue vs. efficient L0 cacheMichael S2014/01/13 03:43 AM
                                Register file read port requirementsNicolas Capens2014/01/11 12:55 AM
                                  Register file read port requirementsRicardo B2014/01/11 05:24 AM
                                    Register file read port requirementsEric Bron2014/01/11 05:32 AM
                                      Register file read port requirementsMichael S2014/01/11 09:57 AM
                                        Register file read port requirementsEric Bron2014/01/11 11:16 AM
                                          Register file read port requirementsMichael S2014/01/11 11:46 AM
                                            Register file read port requirementsEric Bron2014/01/11 12:12 PM
                                              Register file read port requirementsMichael S2014/01/11 12:36 PM
                                                Register file read port requirementsEric Bron2014/01/11 12:51 PM
                                              Register file read port requirementsPatrick Chase2014/01/13 02:27 PM
                                                Register file read port requirementsEric Bron2014/01/13 04:24 PM
                                                  Register file read port requirementsPatrick Chase2014/01/13 06:02 PM
                                                    Register file read port requirementsEric Bron2014/01/14 04:50 AM
                                                      Register file read port requirementsMichael S2014/01/14 11:36 AM
                                                        Register file read port requirementsEric Bron nli2014/01/14 01:04 PM
                                            Register file read port requirementsPatrick Chase2014/01/13 02:17 PM
                                              Register file read port requirementsMichael S2014/01/15 04:27 AM
                                        Register file read port requirementsEric Bron2014/01/11 11:28 AM
                                          Register file read port requirementsMichael S2014/01/11 12:07 PM
                                            Register file read port requirementsPatrick Chase2014/01/13 02:40 PM
                                          Register file read port requirementsPatrick Chase2014/01/13 02:34 PM
                                      Register file read port requirementsRicardo B2014/01/11 12:55 PM
                                        Register file read port requirementsEric Bron2014/01/11 01:17 PM
                                          Register file read port requirementsRicardo B2014/01/11 02:36 PM
                                            Register file read port requirementsEric Bron2014/01/11 02:42 PM
                                              Register file read port requirementsRicardo B2014/01/11 03:20 PM
                                                Register file read port requirementsEric Bron2014/01/11 03:26 PM
                                                  Register file read port requirementsMichael S2014/01/11 04:07 PM
                                                    Register file read port requirementsRicardo B2014/01/11 04:38 PM
                                                      Register file read port requirementsMichael S2014/01/11 04:49 PM
                                                Register file read port requirementsEric Bron2014/01/11 03:39 PM
                                                  Register file read port requirementsEric Bron2014/01/11 03:41 PM
                                                  Register file read port requirementsRicardo B2014/01/11 04:30 PM
                                    Register file read port requirementsNicolas Capens2014/01/11 12:09 PM
              Knights Landing L/S bandwidthanon2014/01/05 06:55 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 07:30 AM
                  Knights Landing L/S bandwidthanon2014/01/06 01:07 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 02:38 AM
                      Knights Landing L/S bandwidthanon2014/01/06 04:01 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 04:44 AM
                          Knights Landing L/S bandwidthanon2014/01/06 05:39 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/06 06:00 AM
                              Knights Landing L/S bandwidthanon2014/01/06 06:44 AM
                                Knights Landing L/S bandwidthMichael S2014/01/06 08:54 AM
                                  Knights Landing L/S bandwidthEric Bron2014/01/06 10:11 AM
                                    Knights Landing L/S bandwidthMichael S2014/01/06 10:14 AM
                                      Knights Landing L/S bandwidthEric Bron2014/01/06 11:37 AM
                                        Knights Landing L/S bandwidthRicardo B2014/01/08 06:25 AM
                                          Knights Landing L/S bandwidthEric Bron2014/01/08 08:36 AM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 08:41 AM
                                            KNC code generator with EVEX back-end?Michael S2014/01/08 09:43 AM
                                              KNC code generator with EVEX back-end?Exophase2014/01/08 10:00 AM
                                                KNC code generator with EVEX back-end?Ricardo B2014/01/08 11:39 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 12:15 PM
                                                    KNC code generator with EVEX back-end?Exophase2014/01/08 01:17 PM
                                                      KNC code generator with EVEX back-end?Ricardo B2014/01/08 02:06 PM
                                                        KNC code generator with EVEX back-end?Exophase2014/01/08 02:24 PM
                                                        KNC code generator with EVEX back-end?Eric Bron2014/01/08 02:38 PM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 01:54 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:25 AM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:35 AM
                                                KNC code generator with EVEX back-end?Michael S2014/01/08 11:07 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 11:24 AM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 11:43 AM
                                                      KNC code generator with EVEX back-end?Eric Bron2014/01/08 01:23 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:43 AM
                                          AVX2 code much different than AVX-512Eric Bron2014/01/08 08:52 AM
                                            evil questionhobold2014/01/08 10:22 AM
                                              evil questionEric Bron2014/01/08 10:27 AM
                                                evil questionhobold2014/01/08 02:33 PM
                                                  evil questionMichael S2014/01/08 02:37 PM
                                                    stupid question (was: evil question)hobold2014/01/09 05:41 AM
                                                      stupid question (was: evil question)Eric Bron2014/01/09 05:52 AM
                                                        stupid question (was: evil question)Michael S2014/01/09 08:00 AM
                                                          stupid question (was: evil question)Michael S2014/01/09 08:12 AM
                                                            stupid question (was: evil question)Eric Bron2014/01/09 10:47 AM
                                                              stupid question (was: evil question)Michael S2014/01/09 11:48 AM
                                                                more decisive (hopefully) test caseMichael S2014/01/09 12:01 PM
                                                                  more decisive (hopefully) test caseEric Bron2014/01/09 12:08 PM
                                                                    more decisive (hopefully) test caseMichael S2014/01/09 12:24 PM
                                                                      more decisive (hopefully) test caseEric Bron2014/01/09 12:27 PM
                                                                        more decisive (hopefully) test caseMichael S2014/01/09 12:33 PM
                                                                  AVX2Eric Bron2014/01/09 12:14 PM
                                                                    AVX2Michael S2014/01/09 12:30 PM
                                                                      AVX2Eric Bron2014/01/09 12:40 PM
                                                                  another tryMichael S2014/01/09 03:02 PM
                                                                    another tryEric Bron2014/01/09 03:33 PM
                                                                      another tryMichael S2014/01/09 04:20 PM
                                                                      another try - ignore misformated mess aboveMichael S2014/01/09 04:24 PM
                                                                        another try - ignore misformated mess aboveGabriele Svelto2014/01/10 01:01 AM
                                                                          another try - ignore misformated mess aboveEric Bron2014/01/10 03:05 AM
                                                                            another try - ignore misformated mess aboveMichael S2014/01/11 10:23 AM
                                                                              another try - ignore misformated mess aboveEric Bron2014/01/11 11:08 AM
                                                                                another try - ignore misformated mess aboveMichael S2014/01/11 12:09 PM
                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 12:12 PM
                                                                                    another try - ignore misformated mess aboveEric Bron2014/01/11 12:24 PM
                                                                                      another try - ignore misformated mess aboveMichael S2014/01/11 01:24 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 02:11 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 02:18 PM
                                                                                            another try - ignore misformated mess aboveEric Bron2014/01/11 02:27 PM
                                                                                              another try - ignore misformated mess aboveMichael S2014/01/11 02:29 PM
                                                                                                another try - ignore misformated mess aboveEric Bron2014/01/11 02:46 PM
                                                                                                  another try - ignore misformated mess aboveEric Bron2014/01/11 02:46 PM
                                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 03:28 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 02:17 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 02:24 PM
                                                                    KNC versionMichael S2014/01/11 05:19 PM
                                                                      KNC versionEric Bron nli2014/01/12 02:59 AM
                                                                        KNC versionGabriele Svelto2014/01/12 09:06 AM
                                                  evil questionEric Bron2014/01/08 02:41 PM
              Knights Landing L/S bandwidthPatrick Chase2014/01/05 11:20 PM
                Knights Landing L/S bandwidthEric Bron2014/01/06 02:45 AM
                  Knights Landing L/S bandwidthanon2014/01/06 04:12 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 04:17 AM
                      Knights Landing L/S bandwidthanon2014/01/06 05:20 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/04 05:34 PM
            Knights Landing L/S bandwidthEric Bron2014/01/04 05:44 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/05 12:25 PM
                Knights Landing L/S bandwidthEric Bron2014/01/05 01:50 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:34 PM
                    Might even help with gatherNicolas Capens2014/01/05 03:40 PM
                      What is an L0 cache?David Kanter2014/01/05 10:44 PM
                        What is an L0 cache?anon2014/01/06 05:57 AM
                          What is an L0 cache?Nicolas Capens2014/01/06 12:57 PM
                            What is an L0 cache?anon2014/01/06 02:18 PM
    Knights Landing L/S bandwidthDavid Kanter2014/01/04 10:58 AM
      Knights Landing L/S bandwidthNicolas Capens2014/01/04 04:24 PM
        Knights Landing L/S bandwidthEric Bron2014/01/04 04:46 PM
          Knights Landing L/S bandwidthKonrad Schwarz2014/01/08 12:48 AM
            Knights Landing L/S bandwidthMichael S2014/01/08 02:45 AM
        Knights Landing L/S bandwidthDavid Kanter2014/01/05 01:44 AM
          Knights Landing L/S bandwidthEric Bron2014/01/05 03:55 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 12:18 PM
            Knights Landing L/S bandwidthMaynard Handley2014/01/05 11:33 PM
              Knights Landing L/S bandwidthEric Bron2014/01/06 04:02 AM
                Knights Landing L/S bandwidthMichael S2014/01/06 04:23 AM
                  Knights Landing L/S bandwidthEric Bron2014/01/06 04:35 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 05:20 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 05:32 AM
                      Knights Landing L/S bandwidthEric Bron2014/01/06 05:36 AM
                        Knights Landing L/S bandwidthMichael S2014/01/06 06:00 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 06:07 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 06:14 AM
                            editsEric Bron2014/01/06 06:22 AM
                              optimized versionEric Bron2014/01/06 06:35 AM
                                yet more optimized versionEric Bron2014/01/06 06:42 AM
                                  latest version for todayEric Bron2014/01/06 06:51 AM
                                    Probably just L2 bandwith limitedNicolas Capens2014/01/06 11:48 AM
                                  yet more optimized versionMaynard Handley2014/01/06 06:54 PM
                                optimized versionMaynard Handley2014/01/06 06:52 PM
                                  optimized versionMichael S2014/01/07 10:42 AM
                                    optimized versionNicolas Capens2014/01/07 12:36 PM
                                      optimized versionMichael S2014/01/07 03:41 PM
                                        optimized versionNicolas Capens2014/01/07 10:52 PM
                                          optimized versionMichael S2014/01/08 02:10 AM
                                    optimized versionEric Bron2014/01/07 02:34 PM
                                      optimized versionMichael S2014/01/07 03:18 PM
                                        optimized versionEric Bron2014/01/07 03:30 PM
                                          optimized versionEric Bron2014/01/07 03:33 PM
                                            optimized versionMichael S2014/01/07 03:57 PM
                                    optimized versionMaynard Handley2014/01/07 06:50 PM
                                      optimized versionMichael S2014/01/08 02:39 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 06:47 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 09:18 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 06:56 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/07 12:18 PM
        Knights Landing L/S bandwidthNoSpammer2014/01/05 01:15 PM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:06 PM
            Knights Landing L/S bandwidthNoSpammer2014/01/06 04:20 AM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 11:54 AM
                Knights Landing L/S bandwidthNoSpammer2014/01/06 01:24 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/06 09:15 PM
                    Knights Landing L/S bandwidthNoSpammer2014/01/07 03:58 AM
                      Knights Landing L/S bandwidthNicolas Capens2014/01/07 03:18 PM
                        Knights Landing L/S bandwidthNoSpammer2014/01/08 01:38 PM
                          Knights Landing L/S bandwidthNicolas Capens2014/01/08 11:14 PM
  AVX512F questionMichael S2014/01/06 10:18 AM
    AVX512F questionNicolas Capens2014/01/06 12:01 PM
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How do you spell green?