llvm/test/CodeGen/NVPTX/shift-opt.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=nvptx64 | FileCheck %s

; Fold: srl (or (x, shl(zext(y),c1)),c1) -> or(srl(x,c1), zext(y))
; c1 <= leadingzeros(zext(y))
define i64 @test_or(i64 %x, i32 %y) {
; CHECK-LABEL: test_or(
; CHECK:       {
; CHECK-NEXT:    .reg .b64 %rd<5>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_or_param_0];
; CHECK-NEXT:    ld.param.b32 %rd2, [test_or_param_1];
; CHECK-NEXT:    shr.u64 %rd3, %rd1, 5;
; CHECK-NEXT:    or.b64 %rd4, %rd3, %rd2;
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd4;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 5
  %or = or i64 %x, %shl
  %srl = lshr i64 %or, 5
  ret i64 %srl
}

; Fold: srl (xor (x, shl(zext(y),c1)),c1) -> xor(srl(x,c1), zext(y))
; c1 <= leadingzeros(zext(y))
define i64 @test_xor(i64 %x, i32 %y) {
; CHECK-LABEL: test_xor(
; CHECK:       {
; CHECK-NEXT:    .reg .b64 %rd<5>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_xor_param_0];
; CHECK-NEXT:    ld.param.b32 %rd2, [test_xor_param_1];
; CHECK-NEXT:    shr.u64 %rd3, %rd1, 5;
; CHECK-NEXT:    xor.b64 %rd4, %rd3, %rd2;
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd4;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 5
  %or = xor i64 %x, %shl
  %srl = lshr i64 %or, 5
  ret i64 %srl
}

; Fold: srl (and (x, shl(zext(y),c1)),c1) -> and(srl(x,c1), zext(y))
; c1 <= leadingzeros(zext(y))
define i64 @test_and(i64 %x, i32 %y) {
; CHECK-LABEL: test_and(
; CHECK:       {
; CHECK-NEXT:    .reg .b64 %rd<5>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_and_param_0];
; CHECK-NEXT:    ld.param.b32 %rd2, [test_and_param_1];
; CHECK-NEXT:    shr.u64 %rd3, %rd1, 5;
; CHECK-NEXT:    and.b64 %rd4, %rd3, %rd2;
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd4;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 5
  %or = and i64 %x, %shl
  %srl = lshr i64 %or, 5
  ret i64 %srl
}

; Fold: srl (or (x, shl(zext(y),c1)),c1) -> or(srl(x,c1), zext(y))
; c1 <= leadingzeros(zext(y))
; x, y - vectors
define <2 x i16> @test_vec(<2 x i16> %x, <2 x i8> %y) {
; CHECK-LABEL: test_vec(
; CHECK:       {
; CHECK-NEXT:    .reg .b16 %rs<7>;
; CHECK-NEXT:    .reg .b32 %r<4>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.v2.b16 {%rs1, %rs2}, [test_vec_param_0];
; CHECK-NEXT:    ld.param.v2.b8 {%rs3, %rs4}, [test_vec_param_1];
; CHECK-NEXT:    mov.b32 %r1, {%rs3, %rs4};
; CHECK-NEXT:    shr.u16 %rs5, %rs2, 5;
; CHECK-NEXT:    shr.u16 %rs6, %rs1, 5;
; CHECK-NEXT:    mov.b32 %r2, {%rs6, %rs5};
; CHECK-NEXT:    or.b32 %r3, %r2, %r1;
; CHECK-NEXT:    st.param.b32 [func_retval0], %r3;
; CHECK-NEXT:    ret;
  %ext = zext <2 x i8> %y to <2 x i16>
  %shl = shl <2 x i16> %ext, splat(i16 5)
  %or = or <2 x i16> %x, %shl
  %srl = lshr <2 x i16> %or, splat(i16 5)
  ret <2 x i16> %srl
}

; Do not fold: srl (or (x, shl(zext(y),c1)),c1) -> or(srl(x,c1), zext(y))
; Reason: c1 > leadingzeros(zext(y)).
define i64 @test_negative_c(i64 %x, i32 %y) {
; CHECK-LABEL: test_negative_c(
; CHECK:       {
; CHECK-NEXT:    .reg .b64 %rd<6>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_negative_c_param_0];
; CHECK-NEXT:    ld.param.b32 %rd2, [test_negative_c_param_1];
; CHECK-NEXT:    shl.b64 %rd3, %rd2, 33;
; CHECK-NEXT:    or.b64 %rd4, %rd1, %rd3;
; CHECK-NEXT:    shr.u64 %rd5, %rd4, 33;
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd5;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 33
  %or = or i64 %x, %shl
  %srl = lshr i64 %or, 33
  ret i64 %srl
}

declare void @use(i64)

; Do not fold: srl (or (x, shl(zext(y),c1)),c1) -> or(srl(x,c1), zext(y))
; Reason: multiple usage of "or"
define i64 @test_negative_use_lop(i64 %x, i32 %y) {
; CHECK-LABEL: test_negative_use_lop(
; CHECK:       {
; CHECK-NEXT:    .reg .b32 %r<2>;
; CHECK-NEXT:    .reg .b64 %rd<5>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_negative_use_lop_param_0];
; CHECK-NEXT:    ld.param.b32 %r1, [test_negative_use_lop_param_1];
; CHECK-NEXT:    mul.wide.u32 %rd2, %r1, 32;
; CHECK-NEXT:    or.b64 %rd3, %rd1, %rd2;
; CHECK-NEXT:    shr.u64 %rd4, %rd3, 5;
; CHECK-NEXT:    { // callseq 0, 0
; CHECK-NEXT:    .param .b64 param0;
; CHECK-NEXT:    st.param.b64 [param0], %rd3;
; CHECK-NEXT:    call.uni use, (param0);
; CHECK-NEXT:    } // callseq 0
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd4;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 5
  %or = or i64 %x, %shl
  %srl = lshr i64 %or, 5
  call void @use(i64 %or)
  ret i64 %srl
}

; Do not fold: srl (or (x, shl(zext(y),c1)),c1) -> or(srl(x,c1), zext(y))
; Reason: multiple usage of "shl"
define i64 @test_negative_use_shl(i64 %x, i32 %y) {
; CHECK-LABEL: test_negative_use_shl(
; CHECK:       {
; CHECK-NEXT:    .reg .b32 %r<2>;
; CHECK-NEXT:    .reg .b64 %rd<5>;
; CHECK-EMPTY:
; CHECK-NEXT:  // %bb.0:
; CHECK-NEXT:    ld.param.b64 %rd1, [test_negative_use_shl_param_0];
; CHECK-NEXT:    ld.param.b32 %r1, [test_negative_use_shl_param_1];
; CHECK-NEXT:    mul.wide.u32 %rd2, %r1, 32;
; CHECK-NEXT:    or.b64 %rd3, %rd1, %rd2;
; CHECK-NEXT:    shr.u64 %rd4, %rd3, 5;
; CHECK-NEXT:    { // callseq 1, 0
; CHECK-NEXT:    .param .b64 param0;
; CHECK-NEXT:    st.param.b64 [param0], %rd2;
; CHECK-NEXT:    call.uni use, (param0);
; CHECK-NEXT:    } // callseq 1
; CHECK-NEXT:    st.param.b64 [func_retval0], %rd4;
; CHECK-NEXT:    ret;
  %ext = zext i32 %y to i64
  %shl = shl i64 %ext, 5
  %or = or i64 %x, %shl
  %srl = lshr i64 %or, 5
  call void @use(i64 %shl)
  ret i64 %srl
}