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STGP

Store Allocation Tag and pair of registers

This instruction stores an Allocation Tag and two 64-bit doublewords to memory, from two registers. The address used for the store is calculated from the base register and an immediate signed offset scaled by the Tag Granule. The Allocation Tag is calculated from the Logical Address Tag in the base register.

This instruction generates an Unchecked access.

It has encodings from 3 classes: Post-index , Pre-index and Signed offset

Post-index
(FEAT_MTE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_MTE) then EndOfDecode(Decode_UNDEF); end; let t : integer{} = UInt(Rt); let t2 : integer{} = UInt(Rt2); let n : integer{} = UInt(Rn); let offset : bits(64) = LSL(SignExtend{64}(simm7), LOG2_TAG_GRANULE); let writeback : boolean = TRUE; let postindex : boolean = TRUE;

Pre-index
(FEAT_MTE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_MTE) then EndOfDecode(Decode_UNDEF); end; let t : integer{} = UInt(Rt); let t2 : integer{} = UInt(Rt2); let n : integer{} = UInt(Rn); let offset : bits(64) = LSL(SignExtend{64}(simm7), LOG2_TAG_GRANULE); let writeback : boolean = TRUE; let postindex : boolean = FALSE;

Signed offset
(FEAT_MTE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_MTE) then EndOfDecode(Decode_UNDEF); end; let t : integer{} = UInt(Rt); let t2 : integer{} = UInt(Rt2); let n : integer{} = UInt(Rn); let offset : bits(64) = LSL(SignExtend{64}(simm7), LOG2_TAG_GRANULE); let writeback : boolean = FALSE; let postindex : boolean = FALSE;