ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition
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ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

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F.3 VFP register banks<br />

The Advanced SIMD <strong>and</strong> VFP registers are divided into banks as follows:<br />

VFP Vector Operation Support<br />

The single-precision registers are divided into four banks of eight. This is shown in Figure F-1. The<br />

first bank is a scalar bank, <strong>and</strong> the other three are vector banks.<br />

In a processor with 32 double-precision registers, the double-precision registers are divided into eight<br />

banks of four. This is shown in Figure F-2. The first <strong>and</strong> fifth banks are scalar banks, <strong>and</strong> the other<br />

six are vector banks.<br />

In a processor with 16 double-precision registers, the double-precision registers are divided into four<br />

banks of four. This is shown in Figure F-3 on page AppxF-6. The first bank is a scalar bank, <strong>and</strong> the<br />

other three are vector banks.<br />

Scalar<br />

bank<br />

d0<br />

d1<br />

d2<br />

d3<br />

Vector<br />

bank<br />

d4<br />

d5<br />

d6<br />

d7<br />

Scalar bank Vector bank Vector bank Vector bank<br />

s0<br />

s1<br />

s2<br />

s3<br />

s4<br />

s5<br />

s6<br />

s7<br />

Vector<br />

bank<br />

d8<br />

d9<br />

d10<br />

d11<br />

Vector<br />

bank<br />

d12<br />

d13<br />

d14<br />

d15<br />

Figure F-1 Single-precision register banks<br />

Figure F-2 Register banks, 32 double-precision register VFP<br />

<strong>ARM</strong> DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 <strong>ARM</strong> Limited. All rights reserved. AppxF-5<br />

s8<br />

s9<br />

s10<br />

s11<br />

s12<br />

s13<br />

s14<br />

s15<br />

Scalar<br />

bank<br />

d16<br />

d17<br />

d18<br />

d19<br />

s16<br />

s17<br />

s18<br />

s18<br />

s20<br />

s21<br />

s22<br />

s23<br />

Vector<br />

bank<br />

d20<br />

d21<br />

d22<br />

d23<br />

Vector<br />

bank<br />

d24<br />

d25<br />

d26<br />

d27<br />

s24<br />

s25<br />

s26<br />

s27<br />

s28<br />

s29<br />

s30<br />

s31<br />

Vector<br />

bank<br />

d28<br />

d29<br />

d30<br />

d31

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