[AMDGPU] NFC: Fix some details for lit test (#127141)

Addressed comments in #126976

Author: jrbyrnes

llvm/test/CodeGen/AMDGPU/iglp-no-clobber.ll

@@ -1,17 +1,48 @@
-; RUN: llc -mtriple=amdgcn -mcpu=gfx942 --stop-after=si-fix-sgpr-copies < %s | FileCheck %s
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 < %s | FileCheck %s
 
 ; iglp.opt should not be flagged as clobbering the memory operand for the global_load, and we should be able to
 ; lower into the scalar version (i.e. should not need to lower into vector version with waterfall loop)
-; CHECK-NOT: WATERFALL
 
-define amdgpu_kernel void @_attn_forward_fp8e5_128x32x64_BW128(ptr addrspace(1) %in, ptr addrspace(3) %out) {
+define amdgpu_kernel void @func(ptr addrspace(1) %in, ptr addrspace(3) %out) {
+; CHECK-LABEL: func:
+; CHECK:       ; %bb.0: ; %.lr.ph
+; CHECK-NEXT:    s_load_dwordx2 s[6:7], s[4:5], 0x0
+; CHECK-NEXT:    s_mov_b64 s[8:9], 0
+; CHECK-NEXT:    s_mov_b64 s[10:11], 0
+; CHECK-NEXT:    s_mov_b32 s3, 32
+; CHECK-NEXT:    s_mov_b32 s2, 0
+; CHECK-NEXT:    s_mov_b64 s[12:13], 0
+; CHECK-NEXT:  .LBB0_1: ; %loop
+; CHECK-NEXT:    ; =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    s_mov_b64 s[0:1], s[10:11]
+; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
+; CHECK-NEXT:    s_add_u32 s10, s6, s12
+; CHECK-NEXT:    s_addc_u32 s11, s7, s13
+; CHECK-NEXT:    s_load_dwordx2 s[12:13], s[8:9], 0x0
+; CHECK-NEXT:    s_add_i32 s3, s3, -1
+; CHECK-NEXT:    s_cmp_lg_u32 s3, 0
+; CHECK-NEXT:    ; iglp_opt mask(0x00000000)
+; CHECK-NEXT:    s_cbranch_scc1 .LBB0_1
+; CHECK-NEXT:  ; %bb.2: ; %end
+; CHECK-NEXT:    s_and_b32 s1, s1, 0xffff
+; CHECK-NEXT:    s_mov_b32 s3, s2
+; CHECK-NEXT:    buffer_load_dwordx2 v[0:1], off, s[0:3], 0
+; CHECK-NEXT:    s_load_dword s0, s[4:5], 0x8
+; CHECK-NEXT:    s_waitcnt vmcnt(0)
+; CHECK-NEXT:    v_mov_b32_e32 v1, 0
+; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
+; CHECK-NEXT:    v_mov_b32_e32 v2, s0
+; CHECK-NEXT:    v_and_b32_e32 v0, 0xff, v0
+; CHECK-NEXT:    ds_write_b64 v2, v[0:1]
+; CHECK-NEXT:    s_endpgm
 .lr.ph:
-  br label %1
+  br label %loop
 
-1:                                                ; preds = %1, %.lr.ph
-  %addr = phi ptr addrspace(1) [ null, %.lr.ph ], [ %gep, %1 ]
-  %offset = phi i64 [ 0, %.lr.ph ], [ %nextOff, %1 ]
-  %inc = phi i32 [0, %.lr.ph], [ %incCond, %1 ] 
+loop:                                                ; preds = %1, %.lr.ph
+  %addr = phi ptr addrspace(1) [ null, %.lr.ph ], [ %gep, %loop ]
+  %offset = phi i64 [ 0, %.lr.ph ], [ %nextOff, %loop ]
+  %inc = phi i32 [0, %.lr.ph], [ %incCond, %loop ]
   %rsrc = tail call ptr addrspace(8) @llvm.amdgcn.make.buffer.rsrc.p1(ptr addrspace(1) %addr, i16 0, i32 0, i32 0)
   %load = tail call <2 x i32> @llvm.amdgcn.raw.ptr.buffer.load.v2i32(ptr addrspace(8) %rsrc, i32 0, i32 0, i32 0)
   %load.bc = bitcast <2 x i32> %load to <8 x i8>
@@ -25,15 +56,13 @@ define amdgpu_kernel void @_attn_forward_fp8e5_128x32x64_BW128(ptr addrspace(1)
   %nextOff = extractelement <1 x i64> %unmaskedload49, i64 0
   %incCond = add i32 %inc, 1
   %cond = icmp eq i32 %incCond, 32
-  br i1 %cond, label %2, label %1 
+  br i1 %cond, label %end, label %loop
 
-2:
+end:
   store <4 x half> %shuff, ptr addrspace(3) %out, align 8
   ret void
 }
 
-; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
 declare ptr addrspace(8) @llvm.amdgcn.make.buffer.rsrc.p1(ptr addrspace(1) readnone, i16, i32, i32) #0
 
-; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: read)
 declare <2 x i32> @llvm.amdgcn.raw.ptr.buffer.load.v2i32(ptr addrspace(8) nocapture readonly, i32, i32, i32 immarg) #1