llvm/test/CodeGen/AVR/shift-expand.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -avr-shift-expand -S %s -o - | FileCheck %s

; The avr-shift-expand pass expands large shifts with a non-constant shift
; amount to a loop. These loops avoid generating a (non-existing) builtin such
; as __ashlsi3.

target datalayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8"
target triple = "avr"

define i32 @shl(i32 %value, i32 %amount) addrspace(1) {
; CHECK-LABEL: @shl(
; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[AMOUNT:%.*]] to i8
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[TMP2]], label [[SHIFT_DONE:%.*]], label [[SHIFT_LOOP:%.*]]
; CHECK:       shift.loop:
; CHECK-NEXT:    [[TMP3:%.*]] = phi i8 [ [[TMP1]], [[TMP0:%.*]] ], [ [[TMP5:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP4:%.*]] = phi i32 [ [[VALUE:%.*]], [[TMP0]] ], [ [[TMP6:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP5]] = sub i8 [[TMP3]], 1
; CHECK-NEXT:    [[TMP6]] = shl i32 [[TMP4]], 1
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i8 [[TMP5]], 0
; CHECK-NEXT:    br i1 [[TMP7]], label [[SHIFT_DONE]], label [[SHIFT_LOOP]]
; CHECK:       shift.done:
; CHECK-NEXT:    [[TMP8:%.*]] = phi i32 [ [[VALUE]], [[TMP0]] ], [ [[TMP6]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    ret i32 [[TMP8]]
;
  %result = shl i32 %value, %amount
  ret i32 %result
}

define i32 @lshr(i32 %value, i32 %amount) addrspace(1) {
; CHECK-LABEL: @lshr(
; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[AMOUNT:%.*]] to i8
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[TMP2]], label [[SHIFT_DONE:%.*]], label [[SHIFT_LOOP:%.*]]
; CHECK:       shift.loop:
; CHECK-NEXT:    [[TMP3:%.*]] = phi i8 [ [[TMP1]], [[TMP0:%.*]] ], [ [[TMP5:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP4:%.*]] = phi i32 [ [[VALUE:%.*]], [[TMP0]] ], [ [[TMP6:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP5]] = sub i8 [[TMP3]], 1
; CHECK-NEXT:    [[TMP6]] = lshr i32 [[TMP4]], 1
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i8 [[TMP5]], 0
; CHECK-NEXT:    br i1 [[TMP7]], label [[SHIFT_DONE]], label [[SHIFT_LOOP]]
; CHECK:       shift.done:
; CHECK-NEXT:    [[TMP8:%.*]] = phi i32 [ [[VALUE]], [[TMP0]] ], [ [[TMP6]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    ret i32 [[TMP8]]
;
  %result = lshr i32 %value, %amount
  ret i32 %result
}

define i32 @ashr(i32 %0, i32 %1) addrspace(1) {
; CHECK-LABEL: @ashr(
; CHECK-NEXT:    [[TMP3:%.*]] = trunc i32 [[TMP1:%.*]] to i8
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i8 [[TMP3]], 0
; CHECK-NEXT:    br i1 [[TMP4]], label [[SHIFT_DONE:%.*]], label [[SHIFT_LOOP:%.*]]
; CHECK:       shift.loop:
; CHECK-NEXT:    [[TMP5:%.*]] = phi i8 [ [[TMP3]], [[TMP2:%.*]] ], [ [[TMP7:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP6:%.*]] = phi i32 [ [[TMP0:%.*]], [[TMP2]] ], [ [[TMP8:%.*]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    [[TMP7]] = sub i8 [[TMP5]], 1
; CHECK-NEXT:    [[TMP8]] = ashr i32 [[TMP6]], 1
; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i8 [[TMP7]], 0
; CHECK-NEXT:    br i1 [[TMP9]], label [[SHIFT_DONE]], label [[SHIFT_LOOP]]
; CHECK:       shift.done:
; CHECK-NEXT:    [[TMP10:%.*]] = phi i32 [ [[TMP0]], [[TMP2]] ], [ [[TMP8]], [[SHIFT_LOOP]] ]
; CHECK-NEXT:    ret i32 [[TMP10]]
;
  %3 = ashr i32 %0, %1
  ret i32 %3
}

; This function is not modified because it is not an i32.
define i40 @shl40(i40 %value, i40 %amount) addrspace(1) {
; CHECK-LABEL: @shl40(
; CHECK-NEXT:    [[RESULT:%.*]] = shl i40 [[VALUE:%.*]], [[AMOUNT:%.*]]
; CHECK-NEXT:    ret i40 [[RESULT]]
;
  %result = shl i40 %value, %amount
  ret i40 %result
}

; This function isn't either, although perhaps it should.
define i24 @shl24(i24 %value, i24 %amount) addrspace(1) {
; CHECK-LABEL: @shl24(
; CHECK-NEXT:    [[RESULT:%.*]] = shl i24 [[VALUE:%.*]], [[AMOUNT:%.*]]
; CHECK-NEXT:    ret i24 [[RESULT]]
;
  %result = shl i24 %value, %amount
  ret i24 %result
}