[AMDGPU][MC][GFX11] Always output wait_vdst and wait_exp (#66610)

Always output values of wait_vdst and wait_exp in assembly even when
they are zero.

While we normally avoid outputing default/zero parameters in assembly,
the values of these parameters still imply wait behaviour when zero.
Outputing zero values makes the intent more obvious to human readers,
and avoid any future ambiguity if we choose to change the defaults to
something other than zero.

Fixes #66383

Author: perlfu

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUInstPrinter.cpp

@@ -532,21 +532,15 @@ void AMDGPUInstPrinter::printDefaultVccOperand(bool FirstOperand,
 void AMDGPUInstPrinter::printWaitVDST(const MCInst *MI, unsigned OpNo,
                                       const MCSubtargetInfo &STI,
                                       raw_ostream &O) {
-  uint8_t Imm = MI->getOperand(OpNo).getImm();
-  if (Imm != 0) {
-    O << " wait_vdst:";
-    printU4ImmDecOperand(MI, OpNo, O);
-  }
+  O << " wait_vdst:";
+  printU4ImmDecOperand(MI, OpNo, O);
 }
 
 void AMDGPUInstPrinter::printWaitEXP(const MCInst *MI, unsigned OpNo,
                                     const MCSubtargetInfo &STI,
                                     raw_ostream &O) {
-  uint8_t Imm = MI->getOperand(OpNo).getImm();
-  if (Imm != 0) {
-    O << " wait_exp:";
-    printU4ImmDecOperand(MI, OpNo, O);
-  }
+  O << " wait_exp:";
+  printU4ImmDecOperand(MI, OpNo, O);
 }
 
 bool AMDGPUInstPrinter::needsImpliedVcc(const MCInstrDesc &Desc,

llvm/test/MC/AMDGPU/gfx11_asm_ldsdir.s

@@ -46,10 +46,10 @@ lds_direct_load v15 wait_vdst:1
 // GFX11: lds_direct_load v15 wait_vdst:1  ; encoding: [0x0f,0x00,0x11,0xce]
 
 lds_direct_load v16 wait_vdst:0
-// GFX11: lds_direct_load v16  ; encoding: [0x10,0x00,0x10,0xce]
+// GFX11: lds_direct_load v16 wait_vdst:0  ; encoding: [0x10,0x00,0x10,0xce]
 
 lds_direct_load v17
-// GFX11: lds_direct_load v17  ; encoding: [0x11,0x00,0x10,0xce]
+// GFX11: lds_direct_load v17 wait_vdst:0 ; encoding: [0x11,0x00,0x10,0xce]
 
 lds_param_load v1, attr0.x wait_vdst:15
 // GFX11: lds_param_load v1, attr0.x wait_vdst:15   ; encoding: [0x01,0x00,0x0f,0xce]