test/Transforms/InstCombine/zext-or-icmp.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s

; Remove an icmp by using its operand in the subsequent logic directly.

define i8 @zext_or_icmp_icmp(i8 %a, i8 %b) {
; CHECK-LABEL: @zext_or_icmp_icmp(
; CHECK-NEXT:    [[MASK:%.*]] = and i8 [[A:%.*]], 1
; CHECK-NEXT:    [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0
; CHECK-NEXT:    [[TOBOOL22:%.*]] = zext i1 [[TOBOOL2]] to i8
; CHECK-NEXT:    [[TMP1:%.*]] = xor i8 [[MASK]], 1
; CHECK-NEXT:    [[ZEXT3:%.*]] = or i8 [[TMP1]], [[TOBOOL22]]
; CHECK-NEXT:    ret i8 [[ZEXT3]]
;
  %mask = and i8 %a, 1
  %toBool1 = icmp eq i8 %mask, 0
  %toBool2 = icmp eq i8 %b, 0
  %bothCond = or i1 %toBool1, %toBool2
  %zext = zext i1 %bothCond to i8
  ret i8 %zext
}

define i8 @zext_or_icmp_icmp_logical(i8 %a, i8 %b) {
; CHECK-LABEL: @zext_or_icmp_icmp_logical(
; CHECK-NEXT:    [[MASK:%.*]] = and i8 [[A:%.*]], 1
; CHECK-NEXT:    [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0
; CHECK-NEXT:    [[TOBOOL22:%.*]] = zext i1 [[TOBOOL2]] to i8
; CHECK-NEXT:    [[TMP1:%.*]] = xor i8 [[MASK]], 1
; CHECK-NEXT:    [[ZEXT3:%.*]] = or i8 [[TMP1]], [[TOBOOL22]]
; CHECK-NEXT:    ret i8 [[ZEXT3]]
;
  %mask = and i8 %a, 1
  %toBool1 = icmp eq i8 %mask, 0
  %toBool2 = icmp eq i8 %b, 0
  %bothCond = select i1 %toBool1, i1 true, i1 %toBool2
  %zext = zext i1 %bothCond to i8
  ret i8 %zext
}

; Here, widening the or from i1 to i32 and removing one of the icmps would
; widen an undef value (created by the out-of-range shift), increasing the
; range of valid values for the return, so we can't do it.

define i32 @dont_widen_undef() {
; CHECK-LABEL: @dont_widen_undef(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[BLOCK2:%.*]]
; CHECK:       block1:
; CHECK-NEXT:    br label [[BLOCK2]]
; CHECK:       block2:
; CHECK-NEXT:    [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ]
; CHECK-NEXT:    [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]]
; CHECK-NEXT:    [[CONV2:%.*]] = zext i1 [[CMP1]] to i32
; CHECK-NEXT:    ret i32 [[CONV2]]
;
entry:
  br label %block2

block1:
  br label %block2

block2:
  %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ]
  %cmp.i = icmp ugt i32 %m.011, 1
  %m.1.op = lshr i32 1, %m.011
  %sext.mask = and i32 %m.1.op, 65535
  %cmp115 = icmp ne i32 %sext.mask, 0
  %cmp1 = or i1 %cmp.i, %cmp115
  %conv2 = zext i1 %cmp1 to i32
  ret i32 %conv2
}

define i32 @dont_widen_undef_logical() {
; CHECK-LABEL: @dont_widen_undef_logical(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[BLOCK2:%.*]]
; CHECK:       block1:
; CHECK-NEXT:    br label [[BLOCK2]]
; CHECK:       block2:
; CHECK-NEXT:    [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ]
; CHECK-NEXT:    [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]]
; CHECK-NEXT:    [[CONV2:%.*]] = zext i1 [[CMP1]] to i32
; CHECK-NEXT:    ret i32 [[CONV2]]
;
entry:
  br label %block2

block1:
  br label %block2

block2:
  %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ]
  %cmp.i = icmp ugt i32 %m.011, 1
  %m.1.op = lshr i32 1, %m.011
  %sext.mask = and i32 %m.1.op, 65535
  %cmp115 = icmp ne i32 %sext.mask, 0
  %cmp1 = select i1 %cmp.i, i1 true, i1 %cmp115
  %conv2 = zext i1 %cmp1 to i32
  ret i32 %conv2
}

; This should not end with more instructions than it started from.

define i32 @PR49475(i32 %x, i16 %y) {
; CHECK-LABEL: @PR49475(
; CHECK-NEXT:    [[M:%.*]] = and i16 [[Y:%.*]], 1
; CHECK-NEXT:    [[B1:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B2:%.*]] = icmp eq i16 [[M]], 0
; CHECK-NEXT:    [[T1:%.*]] = or i1 [[B1]], [[B2]]
; CHECK-NEXT:    [[Z:%.*]] = zext i1 [[T1]] to i32
; CHECK-NEXT:    ret i32 [[Z]]
;
  %m = and i16 %y, 1
  %b1 = icmp eq i32 %x, 0
  %b2 = icmp eq i16 %m, 0
  %t1 = or i1 %b1, %b2
  %z = zext i1 %t1 to i32
  ret i32 %z
}

; This would infinite-loop.

define i8 @PR49475_infloop(i32 %t0, i16 %insert, i64 %e, i8 %i162) {
; CHECK-LABEL: @PR49475_infloop(
; CHECK-NEXT:    [[B:%.*]] = icmp eq i32 [[T0:%.*]], 0
; CHECK-NEXT:    [[B2:%.*]] = icmp eq i16 [[INSERT:%.*]], 0
; CHECK-NEXT:    [[T1:%.*]] = or i1 [[B]], [[B2]]
; CHECK-NEXT:    [[EXT:%.*]] = zext i1 [[T1]] to i32
; CHECK-NEXT:    [[AND:%.*]] = and i32 [[EXT]], [[T0]]
; CHECK-NEXT:    [[TMP1:%.*]] = or i32 [[AND]], 140
; CHECK-NEXT:    [[XOR1:%.*]] = zext i32 [[TMP1]] to i64
; CHECK-NEXT:    [[CONV16:%.*]] = sext i8 [[I162:%.*]] to i64
; CHECK-NEXT:    [[SUB17:%.*]] = sub i64 [[CONV16]], [[E:%.*]]
; CHECK-NEXT:    [[SEXT:%.*]] = shl i64 [[SUB17]], 32
; CHECK-NEXT:    [[CONV18:%.*]] = ashr exact i64 [[SEXT]], 32
; CHECK-NEXT:    [[CMP:%.*]] = icmp sle i64 [[CONV18]], [[XOR1]]
; CHECK-NEXT:    [[CONV19:%.*]] = zext i1 [[CMP]] to i16
; CHECK-NEXT:    [[OR21:%.*]] = or i16 [[CONV19]], [[INSERT]]
; CHECK-NEXT:    [[TRUNC44:%.*]] = trunc i16 [[OR21]] to i8
; CHECK-NEXT:    [[INC:%.*]] = or i8 [[TRUNC44]], [[I162]]
; CHECK-NEXT:    [[TOBOOL23_NOT:%.*]] = icmp eq i16 [[OR21]], 0
; CHECK-NEXT:    call void @llvm.assume(i1 [[TOBOOL23_NOT]])
; CHECK-NEXT:    ret i8 [[INC]]
;
  %b = icmp eq i32 %t0, 0
  %b2 = icmp eq i16 %insert, 0
  %t1 = or i1 %b, %b2
  %ext = zext i1 %t1 to i32
  %and = and i32 %t0, %ext
  %conv13 = zext i32 %and to i64
  %xor = xor i64 %conv13, 140
  %conv16 = sext i8 %i162 to i64
  %sub17 = sub i64 %conv16, %e
  %sext = shl i64 %sub17, 32
  %conv18 = ashr exact i64 %sext, 32
  %cmp = icmp sge i64 %xor, %conv18
  %conv19 = zext i1 %cmp to i16
  %or21 = or i16 %insert, %conv19
  %trunc44 = trunc i16 %or21 to i8
  %inc = add i8 %i162, %trunc44
  %tobool23.not = icmp eq i16 %or21, 0
  call void @llvm.assume(i1 %tobool23.not)
  ret i8 %inc
}

declare void @llvm.assume(i1 noundef)