llvm-project/llvm/test/CodeGen/AMDGPU/promote-alloca-to-lds-select.ll

; RUN: opt -S -mtriple=amdgcn-unknown-amdhsa -mcpu=kaveri -amdgpu-promote-alloca < %s | FileCheck %s

; CHECK-LABEL: @lds_promoted_alloca_select_invalid_pointer_operand(
; CHECK: %alloca = alloca i32
; CHECK: select i1 undef, i32* undef, i32* %alloca
define void @lds_promoted_alloca_select_invalid_pointer_operand() #0 {
  %alloca = alloca i32, align 4
  %select = select i1 undef, i32* undef, i32* %alloca
  store i32 0, i32* %select, align 4
  ret void
}

; CHECK-LABEL: @lds_promote_alloca_select_two_derived_pointers(
; CHECK: [[ARRAYGEP:%[0-9]+]] = getelementptr inbounds [256 x [16 x i32]], [256 x [16 x i32]] addrspace(3)* @lds_promote_alloca_select_two_derived_pointers.alloca, i32 0, i32 %{{[0-9]+}}
; CHECK: %ptr0 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* [[ARRAYGEP]], i32 0, i32 %a
; CHECK: %ptr1 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* [[ARRAYGEP]], i32 0, i32 %b
; CHECK: %select = select i1 undef, i32 addrspace(3)* %ptr0, i32 addrspace(3)* %ptr1
; CHECK: store i32 0, i32 addrspace(3)* %select, align 4
define void @lds_promote_alloca_select_two_derived_pointers(i32 %a, i32 %b) #0 {
  %alloca = alloca [16 x i32], align 4
  %ptr0 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %a
  %ptr1 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %b
  %select = select i1 undef, i32* %ptr0, i32* %ptr1
  store i32 0, i32* %select, align 4
  ret void
}

; FIXME: This should be promotable but requires knowing that both will be promoted first.

; CHECK-LABEL: @lds_promote_alloca_select_two_allocas(
; CHECK: %alloca0 = alloca i32, i32 16, align 4
; CHECK: %alloca1 = alloca i32, i32 16, align 4
; CHECK: %ptr0 = getelementptr inbounds i32, i32* %alloca0, i32 %a
; CHECK: %ptr1 = getelementptr inbounds i32, i32* %alloca1, i32 %b
; CHECK: %select = select i1 undef, i32* %ptr0, i32* %ptr1
define void @lds_promote_alloca_select_two_allocas(i32 %a, i32 %b) #0 {
  %alloca0 = alloca i32, i32 16, align 4
  %alloca1 = alloca i32, i32 16, align 4
  %ptr0 = getelementptr inbounds i32, i32* %alloca0, i32 %a
  %ptr1 = getelementptr inbounds i32, i32* %alloca1, i32 %b
  %select = select i1 undef, i32* %ptr0, i32* %ptr1
  store i32 0, i32* %select, align 4
  ret void
}

; TODO: Maybe this should be canonicalized to select on the constant and GEP after.
; CHECK-LABEL: @lds_promote_alloca_select_two_derived_constant_pointers(
; CHECK: [[ARRAYGEP:%[0-9]+]] = getelementptr inbounds [256 x [16 x i32]], [256 x [16 x i32]] addrspace(3)* @lds_promote_alloca_select_two_derived_constant_pointers.alloca, i32 0, i32 %{{[0-9]+}}
; CHECK: %ptr0 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* [[ARRAYGEP]], i32 0, i32 1
; CHECK: %ptr1 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* [[ARRAYGEP]], i32 0, i32 3
; CHECK: %select = select i1 undef, i32 addrspace(3)* %ptr0, i32 addrspace(3)* %ptr1
; CHECK: store i32 0, i32 addrspace(3)* %select, align 4
define void @lds_promote_alloca_select_two_derived_constant_pointers() #0 {
  %alloca = alloca [16 x i32], align 4
  %ptr0 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 1
  %ptr1 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 3
  %select = select i1 undef, i32* %ptr0, i32* %ptr1
  store i32 0, i32* %select, align 4
  ret void
}

; CHECK-LABEL: @lds_promoted_alloca_select_input_select(
; CHECK: getelementptr inbounds [256 x [16 x i32]], [256 x [16 x i32]] addrspace(3)* @lds_promoted_alloca_select_input_select.alloca, i32 0, i32 %{{[0-9]+}}
; CHECK: %ptr0 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* %{{[0-9]+}}, i32 0, i32 %a
; CHECK: %ptr1 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* %{{[0-9]+}}, i32 0, i32 %b
; CHECK: %ptr2 = getelementptr inbounds [16 x i32], [16 x i32] addrspace(3)* %{{[0-9]+}}, i32 0, i32 %c
; CHECK: %select0 = select i1 undef, i32 addrspace(3)* %ptr0, i32 addrspace(3)* %ptr1
; CHECK: %select1 = select i1 undef, i32 addrspace(3)* %select0, i32 addrspace(3)* %ptr2
; CHECK: store i32 0, i32 addrspace(3)* %select1, align 4
define void @lds_promoted_alloca_select_input_select(i32 %a, i32 %b, i32 %c) #0 {
  %alloca = alloca [16 x i32], align 4
  %ptr0 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %a
  %ptr1 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %b
  %ptr2 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %c
  %select0 = select i1 undef, i32* %ptr0, i32* %ptr1
  %select1 = select i1 undef, i32* %select0, i32* %ptr2
  store i32 0, i32* %select1, align 4
  ret void
}

define void @lds_promoted_alloca_select_input_phi(i32 %a, i32 %b, i32 %c) #0 {
entry:
  %alloca = alloca [16 x i32], align 4
  %ptr0 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %a
  %ptr1 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %b
  store i32 0, i32* %ptr0
  br i1 undef, label %bb1, label %bb2

bb1:
  %ptr2 = getelementptr inbounds [16 x i32], [16 x i32]* %alloca, i32 0, i32 %c
  %select0 = select i1 undef, i32* undef, i32* %ptr2
  store i32 0, i32* %ptr1
  br label %bb2

bb2:
  %phi.ptr = phi i32* [ %ptr0, %entry ], [ %select0, %bb1 ]
  %select1 = select i1 undef, i32* %phi.ptr, i32* %ptr1
  store i32 0, i32* %select1, align 4
  ret void
}

; CHECK-LABEL: @select_null_rhs(
; CHECK-NOT: alloca
; CHECK: select i1 %tmp2, double addrspace(3)* %{{[0-9]+}}, double addrspace(3)* null
define void @select_null_rhs(double addrspace(1)* nocapture %arg, i32 %arg1) #1 {
bb:
  %tmp = alloca double, align 8
  store double 0.000000e+00, double* %tmp, align 8
  %tmp2 = icmp eq i32 %arg1, 0
  %tmp3 = select i1 %tmp2, double* %tmp, double* null
  store double 1.000000e+00, double* %tmp3, align 8
  %tmp4 = load double, double* %tmp, align 8
  store double %tmp4, double addrspace(1)* %arg
  ret void
}

; CHECK-LABEL: @select_null_lhs(
; CHECK-NOT: alloca
; CHECK: select i1 %tmp2, double addrspace(3)* null, double addrspace(3)* %{{[0-9]+}}
define void @select_null_lhs(double addrspace(1)* nocapture %arg, i32 %arg1) #1 {
bb:
  %tmp = alloca double, align 8
  store double 0.000000e+00, double* %tmp, align 8
  %tmp2 = icmp eq i32 %arg1, 0
  %tmp3 = select i1 %tmp2, double* null, double* %tmp
  store double 1.000000e+00, double* %tmp3, align 8
  %tmp4 = load double, double* %tmp, align 8
  store double %tmp4, double addrspace(1)* %arg
  ret void
}

attributes #0 = { norecurse nounwind "amdgpu-waves-per-eu"="1,1" }
attributes #1 = { norecurse nounwind }