xref: /llvm-project/llvm/test/CodeGen/RISCV/shl-demanded.ll (revision 862407510595e37266e3dc0df6a00cad78f420bf)

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
; RUN:   | FileCheck %s -check-prefix=RV32I
; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
; RUN:   | FileCheck %s -check-prefix=RV64I

define void @sext_shl_trunc_same_size(i16 %x, i32 %y, ptr %res) {
; RV32I-LABEL: sext_shl_trunc_same_size:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    sh a0, 0(a2)
; RV32I-NEXT:    ret
;
; RV64I-LABEL: sext_shl_trunc_same_size:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    sh a0, 0(a2)
; RV64I-NEXT:    ret
  %conv = sext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i16
  store i16 %t, ptr %res
  ret void
}

define void @zext_shl_trunc_same_size(i16 %x, i32 %y, ptr %res) {
; RV32I-LABEL: zext_shl_trunc_same_size:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    sh a0, 0(a2)
; RV32I-NEXT:    ret
;
; RV64I-LABEL: zext_shl_trunc_same_size:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    sh a0, 0(a2)
; RV64I-NEXT:    ret
  %conv = zext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i16
  store i16 %t, ptr %res
  ret void
}

define void @sext_shl_trunc_smaller(i16 %x, i32 %y, ptr %res) {
; RV32I-LABEL: sext_shl_trunc_smaller:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    sb a0, 0(a2)
; RV32I-NEXT:    ret
;
; RV64I-LABEL: sext_shl_trunc_smaller:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    sb a0, 0(a2)
; RV64I-NEXT:    ret
  %conv = sext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i8
  store i8 %t, ptr %res
  ret void
}

define void @zext_shl_trunc_smaller(i16 %x, i32 %y, ptr %res) {
; RV32I-LABEL: zext_shl_trunc_smaller:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    sb a0, 0(a2)
; RV32I-NEXT:    ret
;
; RV64I-LABEL: zext_shl_trunc_smaller:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    sb a0, 0(a2)
; RV64I-NEXT:    ret
  %conv = zext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i8
  store i8 %t, ptr %res
  ret void
}

; negative test - demanding 1 high-bit too many to change the extend

define signext i17 @sext_shl_trunc_larger(i16 %x, i32 %y) {
; RV32I-LABEL: sext_shl_trunc_larger:
; RV32I:       # %bb.0:
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srai a0, a0, 16
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    slli a0, a0, 15
; RV32I-NEXT:    srai a0, a0, 15
; RV32I-NEXT:    ret
;
; RV64I-LABEL: sext_shl_trunc_larger:
; RV64I:       # %bb.0:
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srai a0, a0, 48
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    slli a0, a0, 47
; RV64I-NEXT:    srai a0, a0, 47
; RV64I-NEXT:    ret
  %conv = sext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i17
  ret i17 %t
}

; negative test - demanding 1 high-bit too many to change the extend

define zeroext i17 @zext_shl_trunc_larger(i16 %x, i32 %y) {
; RV32I-LABEL: zext_shl_trunc_larger:
; RV32I:       # %bb.0:
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srli a0, a0, 16
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    slli a0, a0, 15
; RV32I-NEXT:    srli a0, a0, 15
; RV32I-NEXT:    ret
;
; RV64I-LABEL: zext_shl_trunc_larger:
; RV64I:       # %bb.0:
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srli a0, a0, 48
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    slli a0, a0, 47
; RV64I-NEXT:    srli a0, a0, 47
; RV64I-NEXT:    ret
  %conv = zext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = trunc i32 %shl to i17
  ret i17 %t
}

define i32 @sext_shl_mask(i16 %x, i32 %y) {
; RV32I-LABEL: sext_shl_mask:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srli a0, a0, 16
; RV32I-NEXT:    ret
;
; RV64I-LABEL: sext_shl_mask:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srli a0, a0, 48
; RV64I-NEXT:    ret
  %conv = sext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = and i32 %shl, 65535
  ret i32 %t
}

define i32 @zext_shl_mask(i16 %x, i32 %y) {
; RV32I-LABEL: zext_shl_mask:
; RV32I:       # %bb.0:
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srli a0, a0, 16
; RV32I-NEXT:    ret
;
; RV64I-LABEL: zext_shl_mask:
; RV64I:       # %bb.0:
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srli a0, a0, 48
; RV64I-NEXT:    ret
  %conv = zext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = and i32 %shl, 65535
  ret i32 %t
}

; negative test - demanding a bit that could change with sext

define i32 @sext_shl_mask_higher(i16 %x, i32 %y) {
; RV32I-LABEL: sext_shl_mask_higher:
; RV32I:       # %bb.0:
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srai a0, a0, 16
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    lui a1, 16
; RV32I-NEXT:    and a0, a0, a1
; RV32I-NEXT:    ret
;
; RV64I-LABEL: sext_shl_mask_higher:
; RV64I:       # %bb.0:
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srai a0, a0, 48
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    lui a1, 16
; RV64I-NEXT:    and a0, a0, a1
; RV64I-NEXT:    ret
  %conv = sext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = and i32 %shl, 65536
  ret i32 %t
}

; negative test - demanding a bit that could change with zext

define i32 @zext_shl_mask_higher(i16 %x, i32 %y) {
; RV32I-LABEL: zext_shl_mask_higher:
; RV32I:       # %bb.0:
; RV32I-NEXT:    slli a0, a0, 16
; RV32I-NEXT:    srli a0, a0, 16
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    lui a1, 16
; RV32I-NEXT:    and a0, a0, a1
; RV32I-NEXT:    ret
;
; RV64I-LABEL: zext_shl_mask_higher:
; RV64I:       # %bb.0:
; RV64I-NEXT:    slli a0, a0, 48
; RV64I-NEXT:    srli a0, a0, 48
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    lui a1, 16
; RV64I-NEXT:    and a0, a0, a1
; RV64I-NEXT:    ret
  %conv = zext i16 %x to i32
  %shl = shl i32 %conv, %y
  %t = and i32 %shl, 65536
  ret i32 %t
}

; May need some, but not all of the bits set by the 'or'.

define i32 @set_shl_mask(i32 %x, i32 %y) {
; RV32I-LABEL: set_shl_mask:
; RV32I:       # %bb.0:
; RV32I-NEXT:    lui a2, 16
; RV32I-NEXT:    addi a3, a2, 1
; RV32I-NEXT:    or a0, a0, a3
; RV32I-NEXT:    sll a0, a0, a1
; RV32I-NEXT:    and a0, a0, a2
; RV32I-NEXT:    ret
;
; RV64I-LABEL: set_shl_mask:
; RV64I:       # %bb.0:
; RV64I-NEXT:    lui a2, 16
; RV64I-NEXT:    addi a3, a2, 1
; RV64I-NEXT:    or a0, a0, a3
; RV64I-NEXT:    sllw a0, a0, a1
; RV64I-NEXT:    and a0, a0, a2
; RV64I-NEXT:    ret
  %z = or i32 %x, 196609
  %s = shl i32 %z, %y
  %r = and i32 %s, 65536
  ret i32 %r
}