VLDMXCSR instruction (AVX)

Forms

Every encoding of VLDMXCSR that Intel XED knows, one row per XED instruction form (iform). How to read the notation.

Instruction	Encoding	Requires
`VLDMXCSR m32` VLDMXCSR_MEMd	`VEX.LZ.NP.0F.WIG AE /2`	AVX

Operation

What the forms do, in pseudocode that our tests run against results recorded on real processors. How to read.

v = src.read()
if v & ~mxcsr_mask:                  # a bit the processor does not have
    fault(GP, 0)
mxcsr = v                            # a flag set with its mask clear
                                     # raises nothing here, nor later:
                                     # an instruction raises only what
                                     # it reports itself

Run on AMD Zen 5 (EPYC 9645): 4 cases.

Operands

What each form reads and writes, as Intel XED records it: the operands of its syntax, in order, and the implicit ones that the syntax does not name. How to read.

Operand	Kind	Action
`VLDMXCSR m32`
`m32`	explicit	read
`MXCSR`	implicit	write

Flags

None: XED records no flag that the forms test or change.

Exceptions

The exception class is XED's name for the set of exception conditions that a form follows. How to read.

All forms: avx-type-5L

Attributes

What else XED records about the forms. How to read.

All forms: follows MXCSR

CPUID and processors

Each form belongs to an XED ISA set. A form can be used when the processor reports every CPUID bit of one of its ISA set's alternatives.

CPUID requirements and processors of the XED ISA sets above. Alternatives are separated by “or”; processors follow XED’s chip model, whose AMD processors end with Zen 2, and the CPU data of this site for Zen 3 to Zen 6.

ISA set	CPUID	Processors
`AVX` AVX	AVX `CPUID.01H:ECX[28]` AVX	Sandy Bridge, Ivy Bridge, Haswell, Broadwell, Skylake, Comet Lake, Cannon Lake, Ice Lake (client), Tiger Lake, Alder Lake, Arrow Lake, Panther Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Sierra Forest, Clearwater Forest, Knights Landing, Knights Mill, Bulldozer, Piledriver, Zen, Zen+, Zen 2, Zen 3, Zen 4, Zen 5, Zen 6

More AVX instructions

All 253 AVX instructions