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1263633
2013 Dec 19
0
[LLVMdev] LLVM ARM VMLA instruction
> As per Renato comment above, vmla instruction is NEON instruction while vmfa is VFP instruction. Correct me if i am wrong on this.
My version 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
2013 Dec 19
1
[LLVMdev] LLVM ARM VMLA instruction
...this lead to
performance degradation?
I would also like to know about accuracy with vmla and pair of vmul and
vadd ops.
--
With regards,
Suyog Sarda
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2013 Dec 19
4
[LLVMdev] LLVM ARM VMLA instruction
Hi Tim,
> > cortex-a15 vfpv4 : vmla instruction emitted (which is a NEON instruction)
>
> I get a VFP vmla here rather than a NEON one (clang -target
> armv7-linux-gnueabihf -mcpu=cortex-a15): "vmla.f32 s0, s1, s2". Are
> you seeing something different?
>
As per Renato comment above, vmla instruction is NEON instruction while
vmfa is VFP instruction. Correct