llvm-project/llvm/test/CodeGen/AMDGPU/ctlz.ll

; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=r600 -mcpu=cypress -verify-machineinstrs < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s

declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
declare <2 x i32> @llvm.ctlz.v2i32(<2 x i32>, i1) nounwind readnone
declare <4 x i32> @llvm.ctlz.v4i32(<4 x i32>, i1) nounwind readnone

declare i64 @llvm.ctlz.i64(i64, i1) nounwind readnone
declare <2 x i64> @llvm.ctlz.v2i64(<2 x i64>, i1) nounwind readnone
declare <4 x i64> @llvm.ctlz.v4i64(<4 x i64>, i1) nounwind readnone

declare i32 @llvm.r600.read.tidig.x() nounwind readnone

; FUNC-LABEL: {{^}}s_ctlz_i32:
; SI: s_load_dword [[VAL:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, {{0xb|0x2c}}
; SI-DAG: s_flbit_i32_b32 [[CTLZ:s[0-9]+]], [[VAL]]
; SI-DAG: v_cmp_eq_i32_e64 [[CMPZ:s\[[0-9]+:[0-9]+\]]], 0, [[VAL]]
; SI-DAG: v_mov_b32_e32 [[VCTLZ:v[0-9]+]], [[CTLZ]]
; SI: v_cndmask_b32_e64 [[RESULT:v[0-9]+]], [[VCTLZ]], 32, [[CMPZ]]
; SI: buffer_store_dword [[RESULT]]
; SI: s_endpgm

; EG: FFBH_UINT
; EG: CNDE_INT
define void @s_ctlz_i32(i32 addrspace(1)* noalias %out, i32 %val) nounwind {
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  store i32 %ctlz, i32 addrspace(1)* %out, align 4
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i32:
; SI: buffer_load_dword [[VAL:v[0-9]+]],
; SI-DAG: v_ffbh_u32_e32 [[CTLZ:v[0-9]+]], [[VAL]]
; SI-DAG: v_cmp_eq_i32_e32 vcc, 0, [[CTLZ]]
; SI: v_cndmask_b32_e64 [[RESULT:v[0-9]+]], [[CTLZ]], 32, vcc
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm

; EG: FFBH_UINT
; EG: CNDE_INT
define void @v_ctlz_i32(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
  %val = load i32, i32 addrspace(1)* %valptr, align 4
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  store i32 %ctlz, i32 addrspace(1)* %out, align 4
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_v2i32:
; SI: buffer_load_dwordx2
; SI: v_ffbh_u32_e32
; SI: v_ffbh_u32_e32
; SI: buffer_store_dwordx2
; SI: s_endpgm

; EG: FFBH_UINT
; EG: CNDE_INT
; EG: FFBH_UINT
; EG: CNDE_INT
define void @v_ctlz_v2i32(<2 x i32> addrspace(1)* noalias %out, <2 x i32> addrspace(1)* noalias %valptr) nounwind {
  %val = load <2 x i32>, <2 x i32> addrspace(1)* %valptr, align 8
  %ctlz = call <2 x i32> @llvm.ctlz.v2i32(<2 x i32> %val, i1 false) nounwind readnone
  store <2 x i32> %ctlz, <2 x i32> addrspace(1)* %out, align 8
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_v4i32:
; SI: buffer_load_dwordx4
; SI: v_ffbh_u32_e32
; SI: v_ffbh_u32_e32
; SI: v_ffbh_u32_e32
; SI: v_ffbh_u32_e32
; SI: buffer_store_dwordx4
; SI: s_endpgm


; EG-DAG: FFBH_UINT
; EG-DAG: CNDE_INT

; EG-DAG: FFBH_UINT
; EG-DAG: CNDE_INT

; EG-DAG: FFBH_UINT
; EG-DAG: CNDE_INT

; EG-DAG: FFBH_UINT
; EG-DAG: CNDE_INT
define void @v_ctlz_v4i32(<4 x i32> addrspace(1)* noalias %out, <4 x i32> addrspace(1)* noalias %valptr) nounwind {
  %val = load <4 x i32>, <4 x i32> addrspace(1)* %valptr, align 16
  %ctlz = call <4 x i32> @llvm.ctlz.v4i32(<4 x i32> %val, i1 false) nounwind readnone
  store <4 x i32> %ctlz, <4 x i32> addrspace(1)* %out, align 16
  ret void
}

; FUNC-LABEL: {{^}}s_ctlz_i64:
; SI: s_load_dwordx2 s{{\[}}[[LO:[0-9]+]]:[[HI:[0-9]+]]{{\]}}, s{{\[[0-9]+:[0-9]+\]}}, {{0xb|0x2c}}
; SI-DAG: v_cmp_eq_i32_e64 vcc, 0, s[[HI]]
; SI-DAG: s_flbit_i32_b32 [[FFBH_LO:s[0-9]+]], s[[LO]]
; SI-DAG: s_add_i32 [[ADD:s[0-9]+]], [[FFBH_LO]], 32
; SI-DAG: s_flbit_i32_b32 [[FFBH_HI:s[0-9]+]], s[[HI]]
; SI-DAG: v_mov_b32_e32 [[VFFBH_LO:v[0-9]+]], [[FFBH_LO]]
; SI-DAG: v_mov_b32_e32 [[VFFBH_HI:v[0-9]+]], [[FFBH_HI]]
; SI-DAG: v_cndmask_b32_e32 v[[CTLZ:[0-9]+]], [[VFFBH_HI]], [[VFFBH_LO]]
; SI-DAG: v_mov_b32_e32 v[[CTLZ_HI:[0-9]+]], 0{{$}}
; SI: {{buffer|flat}}_store_dwordx2 v{{\[}}[[CTLZ]]:[[CTLZ_HI]]{{\]}}
define void @s_ctlz_i64(i64 addrspace(1)* noalias %out, i64 %val) nounwind {
  %ctlz = call i64 @llvm.ctlz.i64(i64 %val, i1 false)
  store i64 %ctlz, i64 addrspace(1)* %out
  ret void
}

; FUNC-LABEL: {{^}}s_ctlz_i64_trunc:
define void @s_ctlz_i64_trunc(i32 addrspace(1)* noalias %out, i64 %val) nounwind {
  %ctlz = call i64 @llvm.ctlz.i64(i64 %val, i1 false)
  %trunc = trunc i64 %ctlz to i32
  store i32 %trunc, i32 addrspace(1)* %out
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i64:
; SI: {{buffer|flat}}_load_dwordx2 v{{\[}}[[LO:[0-9]+]]:[[HI:[0-9]+]]{{\]}}
; SI-DAG: v_cmp_eq_i32_e64 [[CMPHI:s\[[0-9]+:[0-9]+\]]], 0, v[[HI]]
; SI-DAG: v_ffbh_u32_e32 [[FFBH_LO:v[0-9]+]], v[[LO]]
; SI-DAG: v_add_i32_e32 [[ADD:v[0-9]+]], vcc, 32, [[FFBH_LO]]
; SI-DAG: v_ffbh_u32_e32 [[FFBH_HI:v[0-9]+]], v[[HI]]
; SI-DAG: v_cndmask_b32_e64 v[[CTLZ:[0-9]+]], [[FFBH_HI]], [[ADD]], [[CMPHI]]
; SI-DAG: v_or_b32_e32 [[OR:v[0-9]+]], v[[LO]], v[[HI]]
; SI-DAG: v_cmp_eq_i32_e32 vcc, 0, [[OR]]
; SI-DAG: v_cndmask_b32_e64 v[[CLTZ_LO:[0-9]+]], v[[CTLZ:[0-9]+]], 64, vcc
; SI-DAG: v_mov_b32_e32 v[[CTLZ_HI:[0-9]+]], 0{{$}}
; SI: {{buffer|flat}}_store_dwordx2 v{{\[}}[[CLTZ_LO]]:[[CTLZ_HI]]{{\]}}
define void @v_ctlz_i64(i64 addrspace(1)* noalias %out, i64 addrspace(1)* noalias %in) nounwind {
  %tid = call i32 @llvm.r600.read.tidig.x()
  %in.gep = getelementptr i64, i64 addrspace(1)* %in, i32 %tid
  %out.gep = getelementptr i64, i64 addrspace(1)* %out, i32 %tid
  %val = load i64, i64 addrspace(1)* %in.gep
  %ctlz = call i64 @llvm.ctlz.i64(i64 %val, i1 false)
  store i64 %ctlz, i64 addrspace(1)* %out.gep
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i64_trunc:
define void @v_ctlz_i64_trunc(i32 addrspace(1)* noalias %out, i64 addrspace(1)* noalias %in) nounwind {
  %tid = call i32 @llvm.r600.read.tidig.x()
  %in.gep = getelementptr i64, i64 addrspace(1)* %in, i32 %tid
  %out.gep = getelementptr i32, i32 addrspace(1)* %out, i32 %tid
  %val = load i64, i64 addrspace(1)* %in.gep
  %ctlz = call i64 @llvm.ctlz.i64(i64 %val, i1 false)
  %trunc = trunc i64 %ctlz to i32
  store i32 %trunc, i32 addrspace(1)* %out.gep
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i32_sel_eq_neg1:
; SI: buffer_load_dword [[VAL:v[0-9]+]],
; SI: v_ffbh_u32_e32 [[RESULT:v[0-9]+]], [[VAL]]
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm
 define void @v_ctlz_i32_sel_eq_neg1(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
  %val = load i32, i32 addrspace(1)* %valptr
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  %cmp = icmp eq i32 %val, 0
  %sel = select i1 %cmp, i32 -1, i32 %ctlz
  store i32 %sel, i32 addrspace(1)* %out
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i32_sel_ne_neg1:
; SI: buffer_load_dword [[VAL:v[0-9]+]],
; SI: v_ffbh_u32_e32 [[RESULT:v[0-9]+]], [[VAL]]
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm
define void @v_ctlz_i32_sel_ne_neg1(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
  %val = load i32, i32 addrspace(1)* %valptr
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  %cmp = icmp ne i32 %val, 0
  %sel = select i1 %cmp, i32 %ctlz, i32 -1
  store i32 %sel, i32 addrspace(1)* %out
  ret void
}

; TODO: Should be able to eliminate select here as well.
; FUNC-LABEL: {{^}}v_ctlz_i32_sel_eq_bitwidth:
; SI: buffer_load_dword
; SI: v_ffbh_u32_e32
; SI: v_cmp
; SI: v_cndmask
; SI: s_endpgm
define void @v_ctlz_i32_sel_eq_bitwidth(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
  %val = load i32, i32 addrspace(1)* %valptr
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  %cmp = icmp eq i32 %ctlz, 32
  %sel = select i1 %cmp, i32 -1, i32 %ctlz
  store i32 %sel, i32 addrspace(1)* %out
  ret void
}

; FUNC-LABEL: {{^}}v_ctlz_i32_sel_ne_bitwidth:
; SI: buffer_load_dword
; SI: v_ffbh_u32_e32
; SI: v_cmp
; SI: v_cndmask
; SI: s_endpgm
define void @v_ctlz_i32_sel_ne_bitwidth(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
  %val = load i32, i32 addrspace(1)* %valptr
  %ctlz = call i32 @llvm.ctlz.i32(i32 %val, i1 false) nounwind readnone
  %cmp = icmp ne i32 %ctlz, 32
  %sel = select i1 %cmp, i32 %ctlz, i32 -1
  store i32 %sel, i32 addrspace(1)* %out
  ret void
}