s_cbranch_join GPU Native ISA AMD Scalar

S CBRANCH JOIN Scalar Arithmetic

s_cbranch_join

Conditional branch join point (end of conditional branch block).

Encoding

Verified bit-level encoding data is not yet available for this instruction. The instruction-format classification below (SOP1) is well-documented and stable; exact per-target opcode/field bit positions have not yet been imported from a verified source.
Format SOP1
Execution Unit

Operands

Operand details have not yet been curated for this instruction.

GFX Target Compatibility

Per-target GFX compatibility has not yet been verified for this instruction.

Related

More in Scalar Arithmetic

Reference

AMDGPU / GFX ISA

Description

Conditional branch join point (end of conditional branch block). S0 is saved CSP value. See S_CBRANCH_G_FORK and S_CBRANCH_I_FORK for related instructions.

Semantics

saved_csp = S0.u32; if WAVE_MODE.CSP.u32 == saved_csp then PC += 4LL; // Second time to JOIN: continue with program. else WAVE_MODE.CSP -= 3'1U; // First time to JOIN; jump to other FORK path. { PC, EXEC } = SGPR[WAVE_MODE.CSP.u32 * 4U].b128; // Read 128 bits from 4 consecutive SGPRs. endif

Sources