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...). Maybe someone from ARM can answer the question ? Seb From: JF Bastien [mailto:jfb at google.com] Sent: Friday, November 09, 2012 5:36 PM To: Sebastien DELDON-GNB Cc: Anitha Boyapati; llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] fmac generation for cortex-a9 AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I don't know what LLVM does, but it shouldn't emit VFMA when you target A9. VMLA isn't a fused multiply-add, it's a multiply followed by an add and has different latency as well as precision. On Thu, Nov 8, 2012 at 4:57 AM, Sebastien DELDON-GNB <seb...

AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I don't know what LLVM does, but it shouldn't emit VFMA when you target A9. VMLA isn't a fused multiply-add, it's a multiply followed by an add and has different latency as well as precision. On Thu, Nov 8, 2012 at 4:57 AM, Sebastien DELDON-GNB < s...

Hi Anitha, Thanks for your answer but -mcpu=cortex-a9 -mattr=+vfp4 doesn' t enable fused mac generation for me. I would like just to understand why -mtriple=armv7-eabi enables it while -mcpu=cortex-a9 seems to disable it ? Seb > -----Original Message----- > From: Anitha Boyapati [mailto:anitha.boyapati at gmail.com] > Sent: Thursday, November 08, 2012 10:22 AM > To: Sebastien

...m] > > Sent: Friday, November 09, 2012 5:36 PM > > To: Sebastien DELDON-GNB > > Cc: Anitha Boyapati; llvmdev at cs.uiuc.edu > > > > > > Subject: Re: [LLVMdev] fmac generation for cortex-a9 > > > > > > > > AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I > > don't know what LLVM does, but it shouldn't emit VFMA when you target > > A9. VMLA isn't a fused multiply-add, it's a multiply followed by an > > add and has different latency as well as precision. > > > > > > &...

...gt; > From: JF Bastien [mailto:jfb at google.com] > Sent: Friday, November 09, 2012 5:36 PM > To: Sebastien DELDON-GNB > Cc: Anitha Boyapati; llvmdev at cs.uiuc.edu > > > Subject: Re: [LLVMdev] fmac generation for cortex-a9 > > > > AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I don't > know what LLVM does, but it shouldn't emit VFMA when you target A9. VMLA > isn't a fused multiply-add, it's a multiply followed by an add and has > different latency as well as precision. > > > > On Thu, Nov 8, 2012 at 4:5...

...5:36 PM > > > To: Sebastien DELDON-GNB > > > Cc: Anitha Boyapati; llvmdev at cs.uiuc.edu > > > > > > > > > Subject: Re: [LLVMdev] fmac generation for cortex-a9 > > > > > > > > > > > > AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I > > > don't know what LLVM does, but it shouldn't emit VFMA when you target > > > A9. VMLA isn't a fused multiply-add, it's a multiply followed by an > > > add and has different latency as well as precision. > > > &...

...9, 2012 5:36 PM > > To: Sebastien DELDON-GNB > > Cc: Anitha Boyapati; llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu> > > > > > > Subject: Re: [LLVMdev] fmac generation for cortex-a9 > > > > > > > > AFAIK A9 doesn't have VFPv4 or AdvSIMDv2, so it doesn't have VFMA. I > > don't know what LLVM does, but it shouldn't emit VFMA when you target > > A9. VMLA isn't a fused multiply-add, it's a multiply followed by an > > add and has different latency as well as precision. > > > > > > &...