x86-64.net

Instruction

SAR

Shifts an operand right, copying the sign bit into the vacated bits; APX adds three-operand forms and forms that leave the flags unchanged.

Extensions
Forms
48 (12 Legacy, 36 EVEX)
Data
Intel XED v2026.08.23

Forms

Every encoding of SAR that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
SAR m8, imm8 SAR_MEMb_IMMbC0 /7 ibBase instruction set
SAR r8, imm8 SAR_GPR8_IMMbC0 /7 ibBase instruction set
SAR m16/32/64, imm8 SAR_MEMv_IMMbC1 /7 ibBase instruction set
SAR r16/32/64, imm8 SAR_GPRv_IMMbC1 /7 ibBase instruction set
SAR m8, imm8 SAR_MEMb_ONED0 /7Base instruction set
SAR r8, imm8 SAR_GPR8_ONED0 /7Base instruction set
SAR m16/32/64, imm8 SAR_MEMv_ONED1 /7Base instruction set
SAR r16/32/64, imm8 SAR_GPRv_ONED1 /7Base instruction set
SAR m8, CL SAR_MEMb_CLD2 /7Base instruction set
SAR r8, CL SAR_GPR8_CLD2 /7Base instruction set
SAR m16/32/64, CL SAR_MEMv_CLD3 /7Base instruction set
SAR r16/32/64, CL SAR_GPRv_CLD3 /7Base instruction set
SAR r8, imm8 SAR_GPR8i8_IMM8_APXEVEX.LLZ.NP.MAP4.WIG C0 /7 ibAPX_F
SAR m8, imm8 SAR_MEMi8_IMM8_APXEVEX.LLZ.NP.MAP4.WIG C0 /7 ibAPX_F
SAR r8, imm8 NF SAR_GPR8i8_IMM8_APX_N3EVEX.LLZ.NP.MAP4.WIG C0 /7 ib NF=1APX_F + APX_NCI_NDD_NF
SAR m8, imm8 NF SAR_MEMi8_IMM8_APX_N3EVEX.LLZ.NP.MAP4.WIG C0 /7 ib NF=1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, r16/32/64, imm8 NDD NF optional SAR_GPRv_GPRv_IMM8_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ib ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, m16/32/64, imm8 NDD NF optional SAR_GPRv_MEMv_IMM8_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ib ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, imm8 SAR_GPR8i8_ONE_APXEVEX.LLZ.NP.MAP4.WIG D0 /7APX_F
SAR m8, imm8 SAR_MEMi8_ONE_APXEVEX.LLZ.NP.MAP4.WIG D0 /7APX_F
SAR r8, imm8 NF SAR_GPR8i8_ONE_APX_N3EVEX.LLZ.NP.MAP4.WIG D0 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR m8, imm8 NF SAR_MEMi8_ONE_APX_N3EVEX.LLZ.NP.MAP4.WIG D0 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR r8, r8, imm8 NDD NF optional SAR_GPR8i8_GPR8i8_ONE_APX_N3EVEX.LLZ.NP.MAP4.WIG D0 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, m8, imm8 NDD NF optional SAR_GPR8i8_MEMi8_ONE_APX_N3EVEX.LLZ.NP.MAP4.WIG D0 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, imm8 SAR_GPRv_ONE_APXEVEX.LLZ.NP.MAP4.SCALABLE D1 /7APX_F
SAR m16/32/64, imm8 SAR_MEMv_ONE_APXEVEX.LLZ.NP.MAP4.SCALABLE D1 /7APX_F
SAR r16/32/64, imm8 NF SAR_GPRv_ONE_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D1 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR m16/32/64, imm8 NF SAR_MEMv_ONE_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D1 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, r16/32/64, imm8 NDD NF optional SAR_GPRv_GPRv_ONE_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D1 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, m16/32/64, imm8 NDD NF optional SAR_GPRv_MEMv_ONE_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D1 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, CL SAR_GPR8i8_CL_APXEVEX.LLZ.NP.MAP4.WIG D2 /7APX_F
SAR m8, CL SAR_MEMi8_CL_APXEVEX.LLZ.NP.MAP4.WIG D2 /7APX_F
SAR r8, CL NF SAR_GPR8i8_CL_APX_N3EVEX.LLZ.NP.MAP4.WIG D2 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR m8, CL NF SAR_MEMi8_CL_APX_N3EVEX.LLZ.NP.MAP4.WIG D2 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR r8, r8, CL NDD NF optional SAR_GPR8i8_GPR8i8_CL_APX_N3EVEX.LLZ.NP.MAP4.WIG D2 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, m8, CL NDD NF optional SAR_GPR8i8_MEMi8_CL_APX_N3EVEX.LLZ.NP.MAP4.WIG D2 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, CL SAR_GPRv_CL_APXEVEX.LLZ.NP.MAP4.SCALABLE D3 /7APX_F
SAR m16/32/64, CL SAR_MEMv_CL_APXEVEX.LLZ.NP.MAP4.SCALABLE D3 /7APX_F
SAR r16/32/64, CL NF SAR_GPRv_CL_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D3 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR m16/32/64, CL NF SAR_MEMv_CL_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D3 /7 NF=1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, r16/32/64, CL NDD NF optional SAR_GPRv_GPRv_CL_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D3 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, m16/32/64, CL NDD NF optional SAR_GPRv_MEMv_CL_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE D3 /7 ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, r8, imm8 NDD NF optional SAR_GPR8i8_GPR8i8_IMM8_APX_N3EVEX.LLZ.NP.MAP4.WIG C0 /7 ib ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r8, m8, imm8 NDD NF optional SAR_GPR8i8_MEMi8_IMM8_APX_N3EVEX.LLZ.NP.MAP4.WIG C0 /7 ib ND=1 NF=0/1APX_F + APX_NCI_NDD_NF
SAR r16/32/64, imm8 SAR_GPRv_IMM8_APXEVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ibAPX_F
SAR m16/32/64, imm8 SAR_MEMv_IMM8_APXEVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ibAPX_F
SAR r16/32/64, imm8 NF SAR_GPRv_IMM8_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ib NF=1APX_F + APX_NCI_NDD_NF
SAR m16/32/64, imm8 NF SAR_MEMv_IMM8_APX_N3EVEX.LLZ.NP.MAP4.SCALABLE C1 /7 ib NF=1APX_F + APX_NCI_NDD_NF

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, which covers AMD processors up to Zen 2.
ISA setCPUIDProcessors in XED
I186

No CPUID bit: part of the base instruction set.

Every x86-64 processor in XED’s model
I86

No CPUID bit: part of the base instruction set.

Every x86-64 processor in XED’s model
APX_F

APX_F
CPUID.(EAX=07H,ECX=1):EDX[21] APX_F

Nova Lake, Diamond Rapids
APX_F_N3

APX_F + APX_NCI_NDD_NF
CPUID.(EAX=07H,ECX=1):EDX[21] APX_F
CPUID.(EAX=29H,ECX=0):EBX[0] APX_NCI_NDD_NF

Nova Lake, Diamond Rapids

More General-purpose instructions

All 109 General-purpose instructions

More APX instructions

All 88 APX instructions

Sources

  1. Intel XED v2026.08.23 (commit 0bcb6237345c): forms, encodings, ISA sets, CPUID bits and chip model.
  2. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-092, June 2026)
  3. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-093, September 2026)
  4. Intel Advanced Performance Extensions (Intel APX) Architecture Specification, revision 7.0 (July 2025)

The tables are derived from Intel XED, Copyright Intel Corporation, licensed under the Apache License 2.0; x86-64.net converted and reformatted them. The text is our own.