search for: vlma

...quot; to generate instruction, no intrinsic is defined to generate it, correct ? Is it possible for an instruction that is generated through a "pattern" to add also an LLVM intrinsic. My goal here is to not rely on LLVM to generate VMLA but rather having my front-end to generate call to a VLMA intrinsic I would have defined when it thinks it's appropriate to generate one. Hope that's clear. Thanks for your answer Seb From: Renato Golin [mailto:renato.golin at linaro.org] Sent: Friday, February 08, 2013 1:49 PM To: Sebastien DELDON-GNB Cc: llvmdev at cs.uiuc.edu Subject: Re: [LLV...

...intrinsic is defined to generate it, correct ? > > > Correct. > > > Is it possible for an instruction that is generated through a “pattern” to add also an LLVM intrinsic. My goal here is to not rely on LLVM to generate VMLA but rather having my front-end to generate call to a VLMA intrinsic I would have defined when it thinks it’s appropriate to generate one. > > No, and I'm not sure we should have one. > > I understand why you want one, but that's too much back-end knowledge to a front-end, and any pass that can transform a pair of VMLAs into an intrin...

...instruction, no intrinsic is defined to generate it, correct ? > Correct. Is it possible for an instruction that is generated through a “pattern” to > add also an LLVM intrinsic. My goal here is to not rely on LLVM to generate > VMLA but rather having my front-end to generate call to a VLMA intrinsic I > would have defined when it thinks it’s appropriate to generate one. > No, and I'm not sure we should have one. I understand why you want one, but that's too much back-end knowledge to a front-end, and any pass that can transform a pair of VMLAs into an intrinsic call, c...

...ned to generate it, correct ? >> > > Correct. > > > Is it possible for an instruction that is generated through a “pattern” to >> add also an LLVM intrinsic. My goal here is to not rely on LLVM to generate >> VMLA but rather having my front-end to generate call to a VLMA intrinsic I >> would have defined when it thinks it’s appropriate to generate one. >> > No, and I'm not sure we should have one. > > I understand why you want one, but that's too much back-end knowledge to a > front-end, and any pass that can transform a pair of VMLA...

On 8 February 2013 12:28, Sebastien DELDON-GNB <sebastien.deldon at st.com>wrote: > Why for cortex-a9 vmlx-forwarding is enabled by default ? Is it to > guarantee correctness or for performance purpose ? I’ve made some > experiments and DISABLING vmlx-forwarding for cortex-a9 leads to generation > of more vmla/vmls .f32 and significantly improve some benchmarks. I’ve not >

Hi Renato, Thanks for the answer, it confirms what I was suspecting. My problem is that this behavior is controlled by vmlx forwarding on cortex-a9 for which despite asking on this list, I couldn't get a clear understanding what this option is meant for. So here are my new questions: Why for cortex-a9 vmlx-forwarding is enabled by default ? Is it to guarantee correctness or for performance

...rate instruction, no intrinsic is defined to generate it, correct ? Correct. Is it possible for an instruction that is generated through a "pattern" to add also an LLVM intrinsic. My goal here is to not rely on LLVM to generate VMLA but rather having my front-end to generate call to a VLMA intrinsic I would have defined when it thinks it's appropriate to generate one. No, and I'm not sure we should have one. I understand why you want one, but that's too much back-end knowledge to a front-end, and any pass that can transform a pair of VMLAs into an intrinsic call, can als...