AMDGPU: Remove s_waitcnt from gfx1250 support (#145620)

Also add checks to verify that ds_bvh_stack ops, s_wait_samplecnt and s_wait_bvhcnt are no longer supported by gfx1250 (these instructions depend on vimage support).

Author: changpeng

llvm/lib/Target/AMDGPU/SOPInstructions.td

@@ -1589,8 +1589,10 @@ def S_WAKEUP : SOPP_Pseudo <"s_wakeup", (ins) > {
   let mayStore = 1;
 }
 
+let SubtargetPredicate = isNotGFX1250Plus in {
 def S_WAITCNT : SOPP_Pseudo <"s_waitcnt" , (ins SWaitCnt:$simm16), "$simm16",
     [(int_amdgcn_s_waitcnt timm:$simm16)]>;
+}
 
 // "_soft" waitcnts are waitcnts that are either relaxed into their non-soft
 // counterpart, or completely removed.

llvm/test/MC/AMDGPU/gfx1250_asm_unsupported.s

@@ -1,5 +1,32 @@
 ; RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1250 -show-encoding %s 2>&1 | FileCheck --check-prefix=GFX1250-ERR --implicit-check-not=error: --strict-whitespace %s
 
+;; Ray Tracing: DS_BVH_STACK ops
+
+ds_bvh_stack_rtn_b32 v255, v254, v253, v[249:252]
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+ds_bvh_stack_push4_pop1_rtn_b32 v1, v0, v1, v[2:5]
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+ds_bvh_stack_push8_pop1_rtn_b32 v1, v0, v1, v[2:9]
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+ds_bvh_stack_push8_pop2_rtn_b64 v[254:255], v253, v252, v[244:251]
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+;; S_WAIT_*CNT instructions.
+
+s_wait_samplecnt 0x1234
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+s_wait_bvhcnt 0x1234
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+;; S_WAITCNT instruction.
+
+s_waitcnt 0
+// GFX1250-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
 ;; All "TBUFFER" ops, and BUFFER_LOAD/STORE_FORMAT ops.
 
 tbuffer_load_d16_format_x v4, off, s[8:11], s3 format:[BUF_FMT_8_UNORM] offset:8388607