search for: vadd

...Cortex-A8? The TRM referrs to them jumping across pipelines > in odd ways, and that was a very primitive core so it's almost > certainly not going to be just as good as a vmul (in fact if I'm > reading correctly, it takes pretty much exactly the same time as > separate vmul and vadd instructions, 10 cycles vs 2 * 5). > It may seem that total number of cycles are more or less same for single vmla and vmul+vadd. However, when vmul+vadd combination is used instead of vmla, then intermediate results will be generated which needs to be stored in memory for future access. This w...

On 19 December 2013 08:50, suyog sarda <sardask01 at gmail.com> wrote: > It may seem that total number of cycles are more or less same for single > vmla and vmul+vadd. However, when vmul+vadd combination is used instead of > vmla, then intermediate results will be generated which needs to be stored > in memory for future access. This will lead to lot of load/store ops being > inserted which degrade performance. Correct me if i am wrong on this, but >...

Thank You. How to do the same for add please see the following; it gives duplication error. def VADD : I<0x0E, MRMDestReg, (outs VRR128:$dst), (ins VRR128:$src1, VRR128:$src2),"VADD\t{$src1, $src2, $dst|$dst, $src1, $src2}", [(set VRR128:$dst, (add VRR128:$src1, VRR128:$src2))]>, TA; def : Pat<(add VRR128:$src1, VRR128:$src2), (VADD VRPIM128:$src1, VRPIM128:$src2)>; Where...

...n of the ARM architecture reference manual (v7 A & R) lists versions requiring NEON and versions requiring VFP. (Section A8.8.337). Split in just the way you'd expect (SIMD variants need NEON). > It may seem that total number of cycles are more or less same for single vmla > and vmul+vadd. However, when vmul+vadd combination is used instead of vmla, > then intermediate results will be generated which needs to be stored in memory > for future access. Well, it increases register pressure slightly I suppose, but there's no need to store anything to memory unless that gets cr...

On Thu, Dec 19, 2013 at 4:36 PM, Renato Golin <renato.golin at linaro.org>wrote: > On 19 December 2013 08:50, suyog sarda <sardask01 at gmail.com> wrote: > >> It may seem that total number of cycles are more or less same for single >> vmla and vmul+vadd. However, when vmul+vadd combination is used instead of >> vmla, then intermediate results will be generated which needs to be stored >> in memory for future access. This will lead to lot of load/store ops being >> inserted which degrade performance. Correct me if i am wrong on th...

...fferent > instructions. > > ~Craig > > On Tue, Jul 11, 2017 at 8:55 AM, hameeza ahmed <hahmed2305 at gmail.com> > wrote: > >> Thank You. >> >> How to do the same for add please see the following; it gives duplication >> error. >> >> def VADD : I<0x0E, MRMDestReg, (outs VRR128:$dst), (ins VRR128:$src1, >> VRR128:$src2),"VADD\t{$src1, $src2, $dst|$dst, $src1, $src2}", [(set >> VRR128:$dst, (add VRR128:$src1, VRR128:$src2))]>, TA; >> >> def : Pat<(add VRR128:$src1, VRR128:$src2), (VADD VRPIM128...

...artially implemented support for deciding to split a value between multiple registers and I’m wondering if it’s actually intended to solve the problem I’m trying to use it for. RegisterBankInfo.h has this example mapping table: /// E.g., /// Let say we have a 32-bit add and a <2 x 32-bit> vadd. We /// can expand the /// <2 x 32-bit> add into 2 x 32-bit add. /// /// Currently the TableGen-like file would look like: /// \code /// PartialMapping[] = { /// /*32-bit add*/ {0, 32, GPR}, /// /*2x32-bit add*/ {0, 32, GPR}, {0, 32, GPR}, // <-- Same entry 3x /// /*<2...

On 21 September 2012 09:28, Sebastien DELDON-GNB <sebastien.deldon at st.com> wrote: > declare <16 x float> @llvm.arm.neon.vmaxs.v16f32(<16 x float>, <16 x float>) nounwind readnone > > llc fails with following message: > > SplitVectorResult #0: 0x2258350: v16f32 = llvm.arm.neon.vmaxs 0x2258250, 0x2258050, 0x2258150 [ORD=3] [ID=0] > > LLVM ERROR: Do not

...enato, You're pointing me at ARM intrinsics related to loads, problem that I've reported in original e-mail, is not support for vector loads, but support for 'vmaxs'. For instance, there is no vector loads of 16 floats in ARM ISA but it is legal to write in LLVM: ; ModuleID = 'vadd.ll' target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n32" target triple = "armv7-none-linux-androideabi" define void @vaddf32(<16 x float> *%C, <16 x float>* %A, <16 x float>*...

...versions requiring NEON and versions requiring VFP. (Section > A8.8.337). Split in just the way you'd expect (SIMD variants need > NEON). > I will check on this part. > > > It may seem that total number of cycles are more or less same for single > vmla > > and vmul+vadd. However, when vmul+vadd combination is used instead of > vmla, > > then intermediate results will be generated which needs to be stored in > memory > > for future access. > > Well, it increases register pressure slightly I suppose, but there's > no need to store anyt...

Hello all, I'm working on a prototype LLVM pass that would take a function operating on 'magic' vectors and produce a function operating on concrete vectors. For example, given vadd function operating on magic 17-element vectors: typedef float vfloat __attribute__((ext_vector_type(17))); vfloat vadd(vfloat a, vfloat b) { return a+b; } it should produce vadd operating on 4-element vectors: typedef float float4 __attribute__((ext_vector_type(4))); float4 vadd(float4 a, float4...

...intrinsics. Some of them are direct operations (types are the same, return type is the same), some of them are intrinsics. So far so good, but why not make them all intrinsics? I mean, it's ok to have ADD <i8 x 8> transform into a NEON operation, but why not have *also* the intrinsic for VADD? I've seen some intrinsics get changed to raw instructions in the validator, VADD and others could also be done the same way. If no one objects, I'll create them in the table gen files. It's not important, just would be good to keep consistency (and easier to generate IR). -- cheers,...

...d this. And we have load/store instructions for vr. move vpr to vr for v32i16 (from vpr0 to vr1): 1 vclr vr0 // clear vr0 2 ldi r5, 0x00010001 // load immediate (compare bit mask for v32i16) to scalar register r5 3 movr2vr.dup vr2, r5 // duplicate content in r5 into vr2, 4 vadd.t.s16 vr1, vr0, vr2, vpr0 //vector add if element compare bit is set, element type is 16 bit signed integer, now we have moved compare bits from vpr0 to vr1 5 ldi r5, 0x00020002 // load immediate (carry bit mask for v32i16) to scalar register r5 6 movr2vr.dup vr2, r5 // duplicate c...

...q10, q11}, [%[a]]!\n" + " subs %[len], %[len], #16\n" + " vmla.f32 q0, q4, q8\n" + " vmla.f32 q1, q5, q9\n" + " vmla.f32 q2, q6, q10\n" + " vmla.f32 q3, q7, q11\n" + " bne 2b\n" + "3:" + " vadd.f32 q4, q0, q1\n" + " vadd.f32 q5, q2, q3\n" + " cmp %[remainder], #0\n" + " vadd.f32 q0, q4, q5\n" + " beq 5f\n" + "4:" + " vld1.32 {q6}, [%[b]]!\n" + " vld1.32 {q10}, [%[a]]!\n" + " subs...

...is huge. Is it, on Cortex-A8? The TRM referrs to them jumping across pipelines in odd ways, and that was a very primitive core so it's almost certainly not going to be just as good as a vmul (in fact if I'm reading correctly, it takes pretty much exactly the same time as separate vmul and vadd instructions, 10 cycles vs 2 * 5). Cheers. Tim.

I think this test case demonstrates it: ; RUN: llc -march=thumb -mcpu=cortex-a8 -mtriple=thumbv7-eabi -float-abi=hard < %s | FileCheck %s define <4 x i64> @f_4_i64(<4 x i64> %a, <4 x i64> %b) nounwind { ; CHECK: vadd.i64 %y = add <4 x i64> %a, %b ret <4 x i64> %y } (I hope I got that right.) -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not di...

...d this. And we have load/store instructions for vr. move vpr to vr for v32i16 (from vpr0 to vr1): 1 vclr vr0 // clear vr0 2 ldi r5, 0x00010001 // load immediate (compare bit mask for v32i16) to scalar register r5 3 movr2vr.dup vr2, r5 // duplicate content in r5 into vr2, 4 vadd.t.s16 vr1, vr0, vr2, vpr0 //vector add if element compare bit is set, element type is 16 bit signed integer, now we have moved compare bits from vpr0 to vr1 5 ldi r5, 0x00020002 // load immediate (carry bit mask for v32i16) to scalar register r5 6 movr2vr.dup vr2, r5 // duplicate c...

Hi all, I would like to know if LLVM Neon intrinsics are designed to support only 'Legal' types for NEON units. Using llc -march=arm -mcpu=cortex-a9 vmax4.ll -o vmax4.s on following ll code: ; ModuleID = 'vmax.ll' target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n32" target triple =

hello, i need to use v32i32 and v32f32 in store instructions. I defined my register as; def VRR128 : RegisterClass<"X86", [v32i32, v32f32], 1024, (add R_0_V_0, R_1_V_0, R_2_V_0)>; def STORE_DWORD : I<0x70, MRMDestMem, (outs), (ins i2048mem:$dst, VRR128:$src), "STORE_DWORD\t{$src, $dst|$dst, $src}",

...e taken for a 4x4 matrix > multiplication: > What hardware? A7? A8? A9? A15? Also, as stated by Renato - "there is a pipeline stall between two > sequential VMLAs (possibly due to the need of re-use of some registers) and > this made code much slower than a sequence of VMLA+VMUL+VADD" , when i use > -mcpu=cortex-a15 as option, clang emits vmla instructions back to > back(sequential) . Is there something different with cortex-a15 regarding > pipeline stalls, that we are ignoring back to back vmla hazards? > A8 and A15 are quite different beasts. I haven't r...