Arm® A32/T32 Instruction Set Architecture: Armv8, for Armv8-A architecture profile Documentation | VPUSH: Push SIMD&FP registers to Stack: an alias of VSTM, VSTMDB, VSTMIA.

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VPUSH

Push SIMD&FP registers to Stack stores multiple consecutive registers from the Advanced SIMD and floating-point register file to the stack.

This is an alias of VSTM, VSTMDB, VSTMIA. This means:

The encodings in this description are named to match the encodings of VSTM, VSTMDB, VSTMIA.
The description of VSTM, VSTMDB, VSTMIA gives the operational pseudocode for this instruction.

It has encodings from the following instruction sets: A32 ( A1 and A2 ) and T32 ( T1 and T2 ) .

A1

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
!= 1111				1	1	0	1	0	D	1	0	1	1	0	1	Vd				1	0	1	1	imm8<7:1>							0
cond							P	U		W		Rn																			imm8<0>

Decrement Before

VPUSH{<c>}{<q>}{.<size>} <dreglist>

is equivalent to

VSTMDB{<c>}{<q>}{.<size>} SP!, <dreglist>

and is always the preferred disassembly.

A2

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
!= 1111				1	1	0	1	0	D	1	0	1	1	0	1	Vd				1	0	1	0	imm8
cond							P	U		W		Rn

Decrement Before

VPUSH{<c>}{<q>}{.<size>} <sreglist>

is equivalent to

VSTMDB{<c>}{<q>}{.<size>} SP!, <sreglist>

and is always the preferred disassembly.

T1

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	1	0	1	1	0	1	0	D	1	0	1	1	0	1	Vd				1	0	1	1	imm8<7:1>							0
							P	U		W		Rn																			imm8<0>

Decrement Before

VPUSH{<c>}{<q>}{.<size>} <dreglist>

is equivalent to

VSTMDB{<c>}{<q>}{.<size>} SP!, <dreglist>

and is always the preferred disassembly.

T2

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	1	0	1	1	0	1	0	D	1	0	1	1	0	1	Vd				1	0	1	0	imm8
							P	U		W		Rn

Decrement Before

VPUSH{<c>}{<q>}{.<size>} <sreglist>

is equivalent to

VSTMDB{<c>}{<q>}{.<size>} SP!, <sreglist>

and is always the preferred disassembly.

Assembler Symbols

<c>	See Standard assembler syntax fields.

<q>	See Standard assembler syntax fields.

<size>

An optional data size specifier. If present, it must be equal to the size in bits, 32 or 64, of the registers being transferred.

Is the list of consecutively numbered 32-bit SIMD&FP registers to be transferred. The first register in the list is encoded in "Vd:D", and "imm8" is set to the number of registers in the list. The list must contain at least one register.

Is the list of consecutively numbered 64-bit SIMD&FP registers to be transferred. The first register in the list is encoded in "D:Vd", and "imm8" is set to twice the number of registers in the list. The list must contain at least one register, and must not contain more than 16 registers.

Operation

The description of VSTM, VSTMDB, VSTMIA gives the operational pseudocode for this instruction.

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