[AMDGPU] Add support for HW_REG_WAVE_SCHED_MODE

Expose HW_REG_WAVE_SCHED_MODE to the s_getreg_b32, s_setreg_b32,
s_setreg_imm32_b32 instructions.

Author: lancesix

llvm/lib/Target/AMDGPU/SIDefines.h

@@ -541,6 +541,7 @@ enum Id { // HwRegCode, (6) [5:0]
   ID_EXCP_FLAG_PRIV = 17,
   ID_EXCP_FLAG_USER = 18,
   ID_TRAP_CTRL = 19,
+  ID_SCHED_MODE = 26,
 
   // GFX94* specific registers
   ID_XCC_ID = 20,

llvm/lib/Target/AMDGPU/Utils/AMDGPUAsmUtils.cpp

@@ -208,6 +208,7 @@ static constexpr CustomOperand Operands[] = {
   {{"HW_REG_HW_ID"},                  ID_HW_ID1,                      isGFX10},
   {{"HW_REG_SQ_PERF_SNAPSHOT_PC_LO"}, ID_SQ_PERF_SNAPSHOT_PC_LO,      isGFX940},
   {{"HW_REG_WAVE_HW_ID2"},            ID_HW_ID2,                      isGFX12Plus},
+  {{"HW_REG_WAVE_SCHED_MODE"},        ID_SCHED_MODE,                  isGFX12Plus},
   {{"HW_REG_HW_ID2"},                 ID_HW_ID2,                      isGFX10Plus},
   {{"HW_REG_SQ_PERF_SNAPSHOT_PC_HI"}, ID_SQ_PERF_SNAPSHOT_PC_HI,      isGFX940},
   {{"HW_REG_POPS_PACKER"},            ID_POPS_PACKER,                 isGFX10},

llvm/test/MC/AMDGPU/gfx12_asm_sopk.s

@@ -258,3 +258,12 @@ s_getreg_b32 s0, hwreg(HW_REG_SHADER_CYCLES_LO)
 
 s_getreg_b32 s0, hwreg(HW_REG_SHADER_CYCLES_HI)
 // GFX12: encoding: [0x1e,0xf8,0x80,0xb8]
+
+s_getreg_b32 s0, hwreg(HW_REG_WAVE_SCHED_MODE)
+// GFX12: encoding: [0x1a,0xf8,0x80,0xb8]
+
+s_setreg_b32 hwreg(HW_REG_WAVE_SCHED_MODE, 0, 2), s2
+// GFX12: encoding: [0x1a,0x08,0x02,0xb9]
+
+s_setreg_imm32_b32 hwreg(HW_REG_WAVE_SCHED_MODE), 0x2
+// GFX12: encoding: [0x1a,0xf8,0x80,0xb9,0x02,0x00,0x00,0x00]

llvm/test/MC/Disassembler/AMDGPU/gfx12_dasm_sopk.txt

@@ -276,3 +276,12 @@
 
 # GFX12: s_getreg_b32 s0, hwreg(HW_REG_SHADER_CYCLES_HI) ; encoding: [0x1e,0xf8,0x80,0xb8]
 0x1e,0xf8,0x80,0xb8
+
+# GFX12: s_getreg_b32 s0, hwreg(HW_REG_WAVE_SCHED_MODE) ; encoding: [0x1a,0xf8,0x80,0xb8]
+0x1a,0xf8,0x80,0xb8
+
+# GFX12: s_setreg_b32 hwreg(HW_REG_WAVE_SCHED_MODE, 0, 2), s2 ; encoding: [0x1a,0x08,0x02,0xb9]
+0x1a,0x08,0x02,0xb9
+
+# GFX12: s_setreg_imm32_b32 hwreg(HW_REG_WAVE_SCHED_MODE), 2 ; encoding: [0x1a,0xf8,0x80,0xb9,0x02,0x00,0x00,0x00]
+0x1a,0xf8,0x80,0xb9,0x02,0x00,0x00,0x00