File: shift-add.ll

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llvm-toolchain-5.0 1:5.0.1-2~bpo9+1
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; This test makes sure that these instructions are properly eliminated.
;
; RUN: opt < %s -instcombine -S | FileCheck %s

define i32 @shl_C1_add_A_C2_i32(i16 %A) {
; CHECK-LABEL: @shl_C1_add_A_C2_i32(
; CHECK-NEXT:    [[B:%.*]] = zext i16 %A to i32
; CHECK-NEXT:    [[D:%.*]] = shl i32 192, [[B]]
; CHECK-NEXT:    ret i32 [[D]]
;
  %B = zext i16 %A to i32
  %C = add i32 %B, 5
  %D = shl i32 6, %C
  ret i32 %D
}

define i32 @ashr_C1_add_A_C2_i32(i32 %A) {
; CHECK-LABEL: @ashr_C1_add_A_C2_i32(
; CHECK-NEXT:    ret i32 0
;
  %B = and i32 %A, 65535
  %C = add i32 %B, 5
  %D = ashr i32 6, %C
  ret i32 %D
}

define i32 @lshr_C1_add_A_C2_i32(i32 %A) {
; CHECK-LABEL: @lshr_C1_add_A_C2_i32(
; CHECK-NEXT:    [[B:%.*]] = and i32 %A, 65535
; CHECK-NEXT:    [[D:%.*]] = shl i32 192, [[B]]
; CHECK-NEXT:    ret i32 [[D]]
;
  %B = and i32 %A, 65535
  %C = add i32 %B, 5
  %D = shl i32 6, %C
  ret i32 %D
}

define <4 x i32> @shl_C1_add_A_C2_v4i32(<4 x i16> %A) {
; CHECK-LABEL: @shl_C1_add_A_C2_v4i32(
; CHECK-NEXT:    [[B:%.*]] = zext <4 x i16> %A to <4 x i32>
; CHECK-NEXT:    [[D:%.*]] = shl <4 x i32> <i32 6, i32 4, i32 undef, i32 -458752>, [[B]]
; CHECK-NEXT:    ret <4 x i32> [[D]]
;
  %B = zext <4 x i16> %A to <4 x i32>
  %C = add <4 x i32> %B, <i32 0, i32 1, i32 50, i32 16>
  %D = shl <4 x i32> <i32 6, i32 2, i32 1, i32 -7>, %C
  ret <4 x i32> %D
}

define <4 x i32> @ashr_C1_add_A_C2_v4i32(<4 x i32> %A) {
; CHECK-LABEL: @ashr_C1_add_A_C2_v4i32(
; CHECK-NEXT:    [[B:%.*]] = and <4 x i32> %A, <i32 0, i32 15, i32 255, i32 65535>
; CHECK-NEXT:    [[D:%.*]] = ashr <4 x i32> <i32 6, i32 1, i32 undef, i32 -1>, [[B]]
; CHECK-NEXT:    ret <4 x i32> [[D]]
;
  %B = and <4 x i32> %A, <i32 0, i32 15, i32 255, i32 65535>
  %C = add <4 x i32> %B, <i32 0, i32 1, i32 50, i32 16>
  %D = ashr <4 x i32> <i32 6, i32 2, i32 1, i32 -7>, %C
  ret <4 x i32> %D
}

define <4 x i32> @lshr_C1_add_A_C2_v4i32(<4 x i32> %A) {
; CHECK-LABEL: @lshr_C1_add_A_C2_v4i32(
; CHECK-NEXT:    [[B:%.*]] = and <4 x i32> %A, <i32 0, i32 15, i32 255, i32 65535>
; CHECK-NEXT:    [[D:%.*]] = lshr <4 x i32> <i32 6, i32 1, i32 undef, i32 65535>, [[B]]
; CHECK-NEXT:    ret <4 x i32> [[D]]
;
  %B = and <4 x i32> %A, <i32 0, i32 15, i32 255, i32 65535>
  %C = add <4 x i32> %B, <i32 0, i32 1, i32 50, i32 16>
  %D = lshr <4 x i32> <i32 6, i32 2, i32 1, i32 -7>, %C
  ret <4 x i32> %D
}