s_orn2_saveexec_b32 GPU Native ISA AMD Scalar

Scalar Arithmetic

s_orn2_saveexec_b32

Calculate bitwise OR on the scalar input and the negation of the EXEC mask, store the calculated result into the EXEC mask, set SCC iff the…

Also written as s_or_not1_saveexec_b32. AMD's machine-readable ISA specification lists this name for the same instruction.

Encoding

Binary Layout (AMD RDNA 2)
101111101
31:23
SDST
22:16
01000000
15:8
SSRC0
7:0
 

The ENC_SOP1 layout from AMD's machine-readable ISA specification (AMD RDNA 2). Opcode 64 in OP rebuilds 0xBE804000, an identifier AMD lists for this encoding. The same in AMD RDNA 1.

Format SOP1
Width 32 bits
Opcode 64
Identifier 0xBE804000

Operands

  • SDST
    Written. N/A Data format: N/A (OPR_SREG, FMT_NUM_U32)
  • SSRC0
    Read. Simple scalar operands, plus SRC_LITERAL. Covers all operands that are allowed as scalar sources except for SRC_LDS_DIRECT. Data format: N/A (OPR_SSRC_NOLDS, FMT_NUM_U32)

In AMD's order, as its machine-readable ISA specification lists them for the ENC_SOP1 encoding (AMD RDNA 2).

GFX Target Compatibility

TargetSupport
gfx1100✅ Supported

Related

More in Scalar Arithmetic

Reference

AMDGPU / GFX ISA

Description

Calculate bitwise OR on the scalar input and the negation of the EXEC mask, store the calculated result into the EXEC mask, set SCC iff the calculated result is nonzero and store the original value of the EXEC mask into the scalar destination register.

Example

s_orn2_saveexec_b32 s0, 0

A real instruction accepted by the LLVM assembler, taken verbatim from LLVM's own AMDGPU MC test suite. Not from an AMD document, and not authored here.

Sources