[AMDGPU] Update two Codegen tests. (NFC)

This change adds a new Codegen test with auto-generated checks and
updates divergence-driven-trunc-to-i1.ll with auto-generated checks.
This is in preparation to D118461 to visualize the Codegen changes.

Author: tsymalla-AMD

llvm/test/CodeGen/AMDGPU/dagcombine-lshr-and-cmp.ll

@@ -0,0 +1,105 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+; RUN: llc -march=amdgcn -mtriple=amdgcn-- -stop-after=amdgpu-isel -verify-machineinstrs -O0 < %s | FileCheck -check-prefix=GCN %s
+
+define i32 @divergent_lshr_and_cmp(i32 %x) {
+  ; GCN-LABEL: name: divergent_lshr_and_cmp
+  ; GCN: bb.0.entry:
+  ; GCN-NEXT:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
+  ; GCN-NEXT:   liveins: $vgpr0, $sgpr30_sgpr31
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   [[COPY:%[0-9]+]]:sreg_64 = COPY $sgpr30_sgpr31
+  ; GCN-NEXT:   [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+  ; GCN-NEXT:   [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 1
+  ; GCN-NEXT:   [[V_LSHRREV_B32_e64_:%[0-9]+]]:vgpr_32 = V_LSHRREV_B32_e64 killed [[S_MOV_B32_]], [[COPY1]], implicit $exec
+  ; GCN-NEXT:   [[V_AND_B32_e64_:%[0-9]+]]:vgpr_32 = V_AND_B32_e64 1, killed [[V_LSHRREV_B32_e64_]], implicit $exec
+  ; GCN-NEXT:   [[V_CMP_EQ_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_EQ_U32_e64 killed [[V_AND_B32_e64_]], 1, implicit $exec
+  ; GCN-NEXT:   [[SI_IF:%[0-9]+]]:sreg_64 = SI_IF killed [[V_CMP_EQ_U32_e64_]], %bb.2, implicit-def dead $exec, implicit-def dead $scc, implicit $exec
+  ; GCN-NEXT:   S_BRANCH %bb.1
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.1.out.true:
+  ; GCN-NEXT:   successors: %bb.2(0x80000000)
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   [[S_MOV_B32_1:%[0-9]+]]:sreg_32 = S_MOV_B32 2
+  ; GCN-NEXT:   [[V_LSHLREV_B32_e64_:%[0-9]+]]:vgpr_32 = V_LSHLREV_B32_e64 killed [[S_MOV_B32_1]], [[COPY1]], implicit $exec
+  ; GCN-NEXT:   S_BRANCH %bb.2
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.2.UnifiedReturnBlock:
+  ; GCN-NEXT:   [[PHI:%[0-9]+]]:vgpr_32 = PHI [[COPY1]], %bb.0, [[V_LSHLREV_B32_e64_]], %bb.1
+  ; GCN-NEXT:   SI_END_CF [[SI_IF]], implicit-def dead $exec, implicit-def dead $scc, implicit $exec
+  ; GCN-NEXT:   [[COPY2:%[0-9]+]]:ccr_sgpr_64 = COPY [[COPY]]
+  ; GCN-NEXT:   $vgpr0 = COPY [[PHI]]
+  ; GCN-NEXT:   [[COPY3:%[0-9]+]]:ccr_sgpr_64 = COPY [[COPY2]]
+  ; GCN-NEXT:   S_SETPC_B64_return [[COPY3]], implicit $vgpr0
+entry:
+  %0 = and i32 %x, 2
+  %1 = icmp ne i32 %0, 0
+  ; Prevent removal of truncate in SDag by inserting llvm.amdgcn.if
+  br i1 %1, label %out.true, label %out.else
+
+out.true:
+  %2 = shl i32 %x, 2
+  ret i32 %2
+
+out.else:
+  ret i32 %x
+}
+
+define amdgpu_kernel void @uniform_opt_lshr_and_cmp(i1 addrspace(1)* %out, i32 %x) {
+  ; GCN-LABEL: name: uniform_opt_lshr_and_cmp
+  ; GCN: bb.0.entry:
+  ; GCN-NEXT:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
+  ; GCN-NEXT:   liveins: $sgpr0_sgpr1
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   [[COPY:%[0-9]+]]:sgpr_64(p4) = COPY $sgpr0_sgpr1
+  ; GCN-NEXT:   [[S_LOAD_DWORDX2_IMM:%[0-9]+]]:sreg_64_xexec = S_LOAD_DWORDX2_IMM [[COPY]](p4), 9, 0 :: (dereferenceable invariant load (s64) from %ir.out.kernarg.offset.cast, align 4, addrspace 4)
+  ; GCN-NEXT:   [[S_LOAD_DWORD_IMM:%[0-9]+]]:sreg_32_xm0_xexec = S_LOAD_DWORD_IMM [[COPY]](p4), 11, 0 :: (dereferenceable invariant load (s32) from %ir.x.kernarg.offset.cast, addrspace 4)
+  ; GCN-NEXT:   [[COPY1:%[0-9]+]]:sreg_64 = COPY [[S_LOAD_DWORDX2_IMM]]
+  ; GCN-NEXT:   [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 2
+  ; GCN-NEXT:   [[S_AND_B32_:%[0-9]+]]:sreg_32 = S_AND_B32 [[S_LOAD_DWORD_IMM]], killed [[S_MOV_B32_]], implicit-def dead $scc
+  ; GCN-NEXT:   [[S_MOV_B32_1:%[0-9]+]]:sreg_32 = S_MOV_B32 1
+  ; GCN-NEXT:   [[S_LSHR_B32_:%[0-9]+]]:sreg_32 = S_LSHR_B32 [[S_LOAD_DWORD_IMM]], killed [[S_MOV_B32_1]], implicit-def dead $scc
+  ; GCN-NEXT:   [[S_AND_B32_1:%[0-9]+]]:sreg_32 = S_AND_B32 1, killed [[S_LSHR_B32_]], implicit-def dead $scc
+  ; GCN-NEXT:   S_CMP_EQ_U32 killed [[S_AND_B32_1]], 1, implicit-def $scc
+  ; GCN-NEXT:   [[COPY2:%[0-9]+]]:sreg_64 = COPY $scc
+  ; GCN-NEXT:   [[COPY3:%[0-9]+]]:sreg_64_xexec = COPY [[COPY2]]
+  ; GCN-NEXT:   [[S_MOV_B32_2:%[0-9]+]]:sreg_32 = S_MOV_B32 0
+  ; GCN-NEXT:   S_CMP_EQ_U32 killed [[S_AND_B32_]], killed [[S_MOV_B32_2]], implicit-def $scc
+  ; GCN-NEXT:   S_CBRANCH_SCC1 %bb.2, implicit $scc
+  ; GCN-NEXT:   S_BRANCH %bb.1
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.1.out.true:
+  ; GCN-NEXT:   [[S_MOV_B64_:%[0-9]+]]:sreg_64 = S_MOV_B64 -1
+  ; GCN-NEXT:   [[S_XOR_B64_:%[0-9]+]]:sreg_64_xexec = S_XOR_B64 [[COPY3]], killed [[S_MOV_B64_]], implicit-def dead $scc
+  ; GCN-NEXT:   [[COPY4:%[0-9]+]]:sreg_32 = COPY [[COPY1]].sub1
+  ; GCN-NEXT:   [[COPY5:%[0-9]+]]:sreg_32 = COPY [[COPY1]].sub0
+  ; GCN-NEXT:   [[S_MOV_B32_3:%[0-9]+]]:sreg_32 = S_MOV_B32 61440
+  ; GCN-NEXT:   [[S_MOV_B32_4:%[0-9]+]]:sreg_32 = S_MOV_B32 -1
+  ; GCN-NEXT:   [[REG_SEQUENCE:%[0-9]+]]:sgpr_128 = REG_SEQUENCE killed [[COPY5]], %subreg.sub0, killed [[COPY4]], %subreg.sub1, killed [[S_MOV_B32_4]], %subreg.sub2, killed [[S_MOV_B32_3]], %subreg.sub3
+  ; GCN-NEXT:   [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_XOR_B64_]], implicit $exec
+  ; GCN-NEXT:   BUFFER_STORE_BYTE_OFFSET killed [[V_CNDMASK_B32_e64_]], killed [[REG_SEQUENCE]], 0, 0, 0, 0, 0, implicit $exec :: (store (s8) into %ir.out.load, addrspace 1)
+  ; GCN-NEXT:   S_ENDPGM 0
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.2.out.else:
+  ; GCN-NEXT:   [[COPY6:%[0-9]+]]:sreg_32 = COPY [[COPY1]].sub1
+  ; GCN-NEXT:   [[COPY7:%[0-9]+]]:sreg_32 = COPY [[COPY1]].sub0
+  ; GCN-NEXT:   [[S_MOV_B32_5:%[0-9]+]]:sreg_32 = S_MOV_B32 61440
+  ; GCN-NEXT:   [[S_MOV_B32_6:%[0-9]+]]:sreg_32 = S_MOV_B32 -1
+  ; GCN-NEXT:   [[REG_SEQUENCE1:%[0-9]+]]:sgpr_128 = REG_SEQUENCE killed [[COPY7]], %subreg.sub0, killed [[COPY6]], %subreg.sub1, killed [[S_MOV_B32_6]], %subreg.sub2, killed [[S_MOV_B32_5]], %subreg.sub3
+  ; GCN-NEXT:   [[V_CNDMASK_B32_e64_1:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, [[COPY3]], implicit $exec
+  ; GCN-NEXT:   BUFFER_STORE_BYTE_OFFSET killed [[V_CNDMASK_B32_e64_1]], killed [[REG_SEQUENCE1]], 0, 0, 0, 0, 0, implicit $exec :: (store (s8) into %ir.out.load, addrspace 1)
+  ; GCN-NEXT:   S_ENDPGM 0
+entry:
+  %0 = and i32 %x, 2
+  %1 = icmp ne i32 %0, 0
+  ; Don't optimize the truncate in the SDag away.
+  br i1 %1, label %out.true, label %out.else
+
+out.true:
+  %2 = xor i1 %1, -1
+  store i1 %2, i1 addrspace(1)* %out
+  ret void
+
+out.else:
+  store i1 %1, i1 addrspace(1)* %out
+  ret void
+}