This is a collection of Intel®’ IA32® Software Developer's Manuals (URL of the day) and AMD' AMD64 Architecture Programmer's Manual together with the related specifications, application notes, white papers, and change logs. The collection aims to keep all available revisions. It was originally created by Michal Necasek, see OS/2 Museum.

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VSTR

Store SIMD&FP register stores a single register from the Advanced SIMD and floating-point register file to memory, using an address from a general-purpose register, with an optional offset.

Depending on settings in the CPACR, NSACR, HCPTR, and FPEXC registers, and the Security state and PE mode in which the instruction is executed, an attempt to execute the instruction might be UNDEFINED, or trapped to Hyp mode. For more information, see Enabling Advanced SIMD and floating-point support.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1

Decode for all variants of this encoding

if size == '00' || (size == '01' && !IsFeatureImplemented(FEAT_FP16)) then Undefined(); end; if size == '01' && cond != '1110' then UnpredictableProcedure(); end; let add : boolean = (U == '1'); let esize : integer{} = 8 << UInt(size); let imm32 : integer = UInt(imm8) << (if size == '01' then 1 else 2); let d : integer = if size == '11' then UInt(D::Vd) else UInt(Vd::D); let n : integer = UInt(Rn); if n == 15 && CurrentInstrSet() != InstrSet_A32 then UnpredictableProcedure(); end;

CONSTRAINED UNPREDICTABLE behavior

If size == '01' && cond != '1110', then one of the following behaviors must occur:

• The instruction is undefined.
• The instruction executes as if it passes the Condition code check.
• The instruction executes as NOP. This means it behaves as if it fails the Condition code check.

T1

Decode for all variants of this encoding

if size == '00' || (size == '01' && !IsFeatureImplemented(FEAT_FP16)) then Undefined(); end; if size == '01' && InITBlock() then UnpredictableProcedure(); end; let add : boolean = (U == '1'); let esize : integer{} = 8 << UInt(size); let imm32 : integer = UInt(imm8) << (if size == '01' then 1 else 2); let d : integer = if size == '11' then UInt(D::Vd) else UInt(Vd::D); let n : integer = UInt(Rn); if n == 15 && CurrentInstrSet() != InstrSet_A32 then UnpredictableProcedure(); end;

CONSTRAINED UNPREDICTABLE behavior

If size == '01' && InITBlock(), then one of the following behaviors must occur:

• The instruction is undefined.
• The instruction executes as if it passes the Condition code check.
• The instruction executes as NOP. This means it behaves as if it fails the Condition code check.

Assembler Symbols