llvm/test/CodeGen/AMDGPU/truncate-lshr-cast-build-vector-combine.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s | FileCheck %s

; extract element 0 as shift
define i32 @cast_v4i32_to_i128_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %trunc = trunc i128 %bigint to i32
  ret i32 %trunc
}

; extract element 1 as shift
define i32 @cast_v4i32_to_i128_lshr_32_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_32_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_mov_b32_e32 v0, v1
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 32
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; extract element 2 as shift
define i32 @cast_v4i32_to_i128_lshr_64_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_64_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_mov_b32_e32 v0, v2
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 64
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; extract element 3 as shift
define i32 @cast_v4i32_to_i128_lshr_96_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_96_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_mov_b32_e32 v0, v3
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 96
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; Shift not aligned to element, not a simple extract
define i32 @cast_v4i32_to_i128_lshr_33_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_33_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_alignbit_b32 v0, v2, v1, 1
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 33
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; extract misaligned element
define i32 @cast_v4i32_to_i128_lshr_31_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_31_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_alignbit_b32 v0, v1, v0, 31
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 31
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; extract misaligned element
define i32 @cast_v4i32_to_i128_lshr_48_trunc_i32(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_48_trunc_i32:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    s_mov_b32 s4, 0x1000706
; CHECK-NEXT:    v_perm_b32 v0, v1, v2, s4
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 48
  %trunc = trunc i128 %srl to i32
  ret i32 %trunc
}

; extract elements 1 and 2 with shift
define i64 @cast_v4i32_to_i128_lshr_32_trunc_i64(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_32_trunc_i64:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_mov_b32_e32 v0, v1
; CHECK-NEXT:    v_mov_b32_e32 v1, v2
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 32
  %trunc = trunc i128 %srl to i64
  ret i64 %trunc
}

; extract elements 2 and 3 with shift
define i64 @cast_v4i32_to_i128_lshr_64_trunc_i64(<4 x i32> %arg) {
; CHECK-LABEL: cast_v4i32_to_i128_lshr_64_trunc_i64:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    v_mov_b32_e32 v1, v3
; CHECK-NEXT:    v_mov_b32_e32 v0, v2
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %bigint = bitcast <4 x i32> %arg to i128
  %srl = lshr i128 %bigint, 64
  %trunc = trunc i128 %srl to i64
  ret i64 %trunc
}

; FIXME: We don't process this case because we see multiple bitcasts
; before a 32-bit build_vector
define i32 @build_vector_i16_to_shift(i16 %arg0, i16 %arg1, i16 %arg2, i16 %arg3) {
; CHECK-LABEL: build_vector_i16_to_shift:
; CHECK:       ; %bb.0:
; CHECK-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT:    s_mov_b32 s4, 0x5040100
; CHECK-NEXT:    v_perm_b32 v0, v3, v2, s4
; CHECK-NEXT:    s_setpc_b64 s[30:31]
  %ins.0 = insertelement <4 x i16> poison, i16 %arg0, i32 0
  %ins.1 = insertelement <4 x i16> %ins.0, i16 %arg1, i32 1
  %ins.2 = insertelement <4 x i16> %ins.1, i16 %arg2, i32 2
  %ins.3 = insertelement <4 x i16> %ins.2, i16 %arg3, i32 3

  %cast = bitcast <4 x i16> %ins.3 to i64
  %srl = lshr i64 %cast, 32
  %trunc = trunc i64 %srl to i32
  ret i32 %trunc
}