llvm-project/llvm/docs/AMDGPU/gfx9_hwreg.rst

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.. _amdgpu_synid9_hwreg:
hwreg
===========================
Bits of a hardware register being accessed.
The bits of this operand have the following meaning:
============ ===================================
Bits Description
============ ===================================
5:0 Register *id*.
10:6 First bit *offset* (0..31).
15:11 *Size* in bits (1..32).
============ ===================================
This operand may be specified as a positive 16-bit :ref:`integer_number<amdgpu_synid_integer_number>` or using the syntax described below.
==================================== ============================================================================
Syntax Description
==================================== ============================================================================
hwreg({0..63}) All bits of a register indicated by its *id*.
hwreg(<*name*>) All bits of a register indicated by its *name*.
hwreg({0..63}, {0..31}, {1..32}) Register bits indicated by register *id*, first bit *offset* and *size*.
hwreg(<*name*>, {0..31}, {1..32}) Register bits indicated by register *name*, first bit *offset* and *size*.
==================================== ============================================================================
Register *id*, *offset* and *size* must be specified as positive :ref:`integer numbers<amdgpu_synid_integer_number>`.
Defined register *names* include:
=================== ==========================================
Name Description
=================== ==========================================
HW_REG_MODE Shader writeable mode bits.
HW_REG_STATUS Shader read-only status.
HW_REG_TRAPSTS Trap status.
HW_REG_HW_ID Id of wave, simd, compute unit, etc.
HW_REG_GPR_ALLOC Per-wave SGPR and VGPR allocation.
HW_REG_LDS_ALLOC Per-wave LDS allocation.
HW_REG_IB_STS Counters of outstanding instructions.
HW_REG_SH_MEM_BASES Memory aperture.
=================== ==========================================
Examples:
.. parsed-literal::
s_getreg_b32 s2, 0x6
s_getreg_b32 s2, hwreg(15)
s_getreg_b32 s2, hwreg(51, 1, 31)
s_getreg_b32 s2, hwreg(HW_REG_LDS_ALLOC, 0, 1)