AMDGPU: Replace some undef uses in tests (llvm#166813)

Author: arsenm

llvm/test/CodeGen/AMDGPU/branch-relaxation-gfx1250.ll

@@ -280,7 +280,7 @@ bb0:
   br i1 %tmp, label %bb2, label %bb3
 
 bb2:
-  store volatile i32 17, ptr addrspace(1) undef
+  store volatile i32 17, ptr addrspace(1) poison
   br label %bb4
 
 bb3:
@@ -375,7 +375,7 @@ bb0:
   br i1 %cmp0, label %bb2, label %bb1
 
 bb1:
-  %val = load volatile i32, ptr addrspace(4) undef
+  %val = load volatile i32, ptr addrspace(4) poison
   %cmp1 = icmp eq i32 %val, 3
   br i1 %cmp1, label %bb3, label %bb2
 
@@ -512,7 +512,7 @@ loop_body:
   br label %loop
 
 ret:
-  store volatile i32 7, ptr addrspace(1) undef
+  store volatile i32 7, ptr addrspace(1) poison
   ret void
 }
 
@@ -622,7 +622,7 @@ bb14:                                             ; preds = %bb13, %bb9
   br label %bb19
 
 bb19:                                             ; preds = %bb14, %bb13, %bb9
-  %tmp20 = phi i32 [ undef, %bb9 ], [ undef, %bb13 ], [ %tmp18, %bb14 ]
+  %tmp20 = phi i32 [ poison, %bb9 ], [ poison, %bb13 ], [ %tmp18, %bb14 ]
   %tmp21 = getelementptr inbounds i32, ptr addrspace(1) %arg, i64 %arg5
   store i32 %tmp20, ptr addrspace(1) %tmp21, align 4
   ret void

llvm/test/CodeGen/AMDGPU/flat-saddr-atomics.ll

@@ -263,7 +263,7 @@ define amdgpu_ps float @flat_xchg_saddr_i32_rtn_neg2048(ptr inreg %sbase, i32 %v
 ; Uniformity edge cases
 ; --------------------------------------------------------------------------------
 
-@ptr.in.lds = internal addrspace(3) global ptr undef
+@ptr.in.lds = internal addrspace(3) global ptr poison
 
 ; Base pointer is uniform, but also in VGPRs
 define amdgpu_ps float @flat_xchg_saddr_uniform_ptr_in_vgprs_rtn(i32 %voffset, i32 %data) {

llvm/test/CodeGen/AMDGPU/flat-saddr-store.ll

@@ -54,7 +54,7 @@ define amdgpu_ps void @flat_store_saddr_i8_zext_vgpr_offset_neg2048(ptr inreg %s
 ; Uniformity edge cases
 ; --------------------------------------------------------------------------------
 
-@ptr.in.lds = internal addrspace(3) global ptr undef
+@ptr.in.lds = internal addrspace(3) global ptr poison
 
 ; Base pointer is uniform, but also in VGPRs
 define amdgpu_ps void @flat_store_saddr_uniform_ptr_in_vgprs(i32 %voffset, i8 %data) {

llvm/test/CodeGen/AMDGPU/scheduler-rp-calc-one-successor-two-predecessors-bug.ll

@@ -46,7 +46,7 @@ define amdgpu_ps void @_amdgpu_ps_main(float %arg) {
 ; GFX900-NEXT:    s_mov_b64 exec, 0
 ; GFX900-NEXT:    s_waitcnt vmcnt(0)
 ; GFX900-NEXT:    v_mov_b32_e32 v1, 0
-; GFX900-NEXT:    v_mov_b32_e32 v2, 0
+; GFX900-NEXT:    v_mov_b32_e32 v2, v1
 ; GFX900-NEXT:  .LBB0_5: ; %bb6
 ; GFX900-NEXT:    s_or_b64 exec, exec, s[0:1]
 ; GFX900-NEXT:    s_waitcnt vmcnt(0)
@@ -75,7 +75,7 @@ bb5:
 bb6:
   %i7 = phi float [ 0.000000e+00, %bb5 ], [ %i3, %bb1 ]
   %i8 = phi float [ 0.000000e+00, %bb5 ], [ 1.000000e+00, %bb1 ]
-  %i9 = phi float [ undef, %bb5 ], [ %i4, %bb1 ]
+  %i9 = phi float [ poison, %bb5 ], [ %i4, %bb1 ]
   %i10 = call <2 x half> @llvm.amdgcn.cvt.pkrtz(float 0.000000e+00, float %i7)
   %i11 = call <2 x half> @llvm.amdgcn.cvt.pkrtz(float %i8, float %i9)
   call void @llvm.amdgcn.exp.compr.v2f16(i32 0, i32 0, <2 x half> %i10, <2 x half> %i11, i1 false, i1 false)

llvm/test/CodeGen/AMDGPU/tuple-allocation-failure.ll

@@ -655,7 +655,7 @@ bb:
   br label %bb5
 
 bb5:                                              ; preds = %bb5.backedge, %bb
-  %tmp4.i.sroa.0.0 = phi <9 x double> [ undef, %bb ], [ %tmp4.i.sroa.0.1, %bb5.backedge ]
+  %tmp4.i.sroa.0.0 = phi <9 x double> [ poison, %bb ], [ %tmp4.i.sroa.0.1, %bb5.backedge ]
   %tmp14.1.i = load i32, ptr inttoptr (i64 128 to ptr), align 128
   store i32 0, ptr addrspace(5) null, align 4
   %tmp14.2.i = load i32, ptr inttoptr (i64 128 to ptr), align 128