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eliminate-comparison.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -indvars -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
@X = external global [0 x double]
; Indvars should be able to simplify simple comparisons involving
; induction variables.
define void @foo(i64 %n, i32* nocapture %p) nounwind {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP9:%.*]] = icmp sgt i64 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP9]], label [[PRE:%.*]], label [[RETURN:%.*]]
; CHECK: pre:
; CHECK-NEXT: [[T3:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp ne i32 [[T3]], 0
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, [[PRE]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT: [[COND:%.*]] = and i1 [[TOBOOL_NOT]], true
; CHECK-NEXT: br i1 [[COND]], label [[IF_THEN:%.*]], label [[FOR_INC]]
; CHECK: if.then:
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr [0 x double], [0 x double]* @X, i64 0, i64 [[I]]
; CHECK-NEXT: store double 3.200000e+00, double* [[ARRAYIDX]], align 8
; CHECK-NEXT: br label [[FOR_INC]]
; CHECK: for.inc:
; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT: [[EXITCOND1:%.*]] = icmp eq i64 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND1]], label [[RETURN_LOOPEXIT:%.*]], label [[LOOP]]
; CHECK: return.loopexit:
; CHECK-NEXT: br label [[RETURN]]
; CHECK: return:
; CHECK-NEXT: ret void
;
entry:
%cmp9 = icmp sgt i64 %n, 0
br i1 %cmp9, label %pre, label %return
pre:
%t3 = load i32, i32* %p
%tobool.not = icmp ne i32 %t3, 0
br label %loop
loop:
%i = phi i64 [ 0, %pre ], [ %inc, %for.inc ]
%cmp6 = icmp slt i64 %i, %n
%cond = and i1 %tobool.not, %cmp6
br i1 %cond, label %if.then, label %for.inc
if.then:
%arrayidx = getelementptr [0 x double], [0 x double]* @X, i64 0, i64 %i
store double 3.200000e+00, double* %arrayidx
br label %for.inc
for.inc:
%inc = add nsw i64 %i, 1
%exitcond = icmp sge i64 %inc, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; Don't eliminate an icmp that's contributing to the loop exit test though.
define i32 @_ZNK4llvm5APInt3ultERKS0_(i32 %tmp2.i1, i64** %tmp65, i64** %tmp73, i64** %tmp82, i64** %tmp90) {
; CHECK-LABEL: @_ZNK4llvm5APInt3ultERKS0_(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB18:%.*]]
; CHECK: bb13:
; CHECK-NEXT: [[TMP66:%.*]] = load i64*, i64** [[TMP65:%.*]], align 4
; CHECK-NEXT: [[TMP68:%.*]] = getelementptr inbounds i64, i64* [[TMP66]], i32 [[I:%.*]]
; CHECK-NEXT: [[TMP69:%.*]] = load i64, i64* [[TMP68]], align 4
; CHECK-NEXT: [[TMP74:%.*]] = load i64*, i64** [[TMP73:%.*]], align 4
; CHECK-NEXT: [[TMP76:%.*]] = getelementptr inbounds i64, i64* [[TMP74]], i32 [[I]]
; CHECK-NEXT: [[TMP77:%.*]] = load i64, i64* [[TMP76]], align 4
; CHECK-NEXT: [[TMP78:%.*]] = icmp ugt i64 [[TMP69]], [[TMP77]]
; CHECK-NEXT: br i1 [[TMP78]], label [[BB20_LOOPEXIT:%.*]], label [[BB15:%.*]]
; CHECK: bb15:
; CHECK-NEXT: [[TMP83:%.*]] = load i64*, i64** [[TMP82:%.*]], align 4
; CHECK-NEXT: [[TMP85:%.*]] = getelementptr inbounds i64, i64* [[TMP83]], i32 [[I]]
; CHECK-NEXT: [[TMP86:%.*]] = load i64, i64* [[TMP85]], align 4
; CHECK-NEXT: [[TMP91:%.*]] = load i64*, i64** [[TMP90:%.*]], align 4
; CHECK-NEXT: [[TMP93:%.*]] = getelementptr inbounds i64, i64* [[TMP91]], i32 [[I]]
; CHECK-NEXT: [[TMP94:%.*]] = load i64, i64* [[TMP93]], align 4
; CHECK-NEXT: [[TMP95:%.*]] = icmp ult i64 [[TMP86]], [[TMP94]]
; CHECK-NEXT: br i1 [[TMP95]], label [[BB20_LOOPEXIT]], label [[BB17:%.*]]
; CHECK: bb17:
; CHECK-NEXT: [[TMP97:%.*]] = add nsw i32 [[I]], -1
; CHECK-NEXT: br label [[BB18]]
; CHECK: bb18:
; CHECK-NEXT: [[I]] = phi i32 [ [[TMP2_I1:%.*]], [[ENTRY:%.*]] ], [ [[TMP97]], [[BB17]] ]
; CHECK-NEXT: [[TMP99:%.*]] = icmp sgt i32 [[I]], -1
; CHECK-NEXT: br i1 [[TMP99]], label [[BB13:%.*]], label [[BB20_LOOPEXIT]]
; CHECK: bb20.loopexit:
; CHECK-NEXT: [[TMP_0_PH:%.*]] = phi i32 [ 0, [[BB18]] ], [ 1, [[BB15]] ], [ 0, [[BB13]] ]
; CHECK-NEXT: ret i32 [[TMP_0_PH]]
;
entry:
br label %bb18
bb13:
%tmp66 = load i64*, i64** %tmp65, align 4
%tmp68 = getelementptr inbounds i64, i64* %tmp66, i32 %i
%tmp69 = load i64, i64* %tmp68, align 4
%tmp74 = load i64*, i64** %tmp73, align 4
%tmp76 = getelementptr inbounds i64, i64* %tmp74, i32 %i
%tmp77 = load i64, i64* %tmp76, align 4
%tmp78 = icmp ugt i64 %tmp69, %tmp77
br i1 %tmp78, label %bb20.loopexit, label %bb15
bb15:
%tmp83 = load i64*, i64** %tmp82, align 4
%tmp85 = getelementptr inbounds i64, i64* %tmp83, i32 %i
%tmp86 = load i64, i64* %tmp85, align 4
%tmp91 = load i64*, i64** %tmp90, align 4
%tmp93 = getelementptr inbounds i64, i64* %tmp91, i32 %i
%tmp94 = load i64, i64* %tmp93, align 4
%tmp95 = icmp ult i64 %tmp86, %tmp94
br i1 %tmp95, label %bb20.loopexit, label %bb17
bb17:
%tmp97 = add nsw i32 %i, -1
br label %bb18
bb18:
%i = phi i32 [ %tmp2.i1, %entry ], [ %tmp97, %bb17 ]
%tmp99 = icmp sgt i32 %i, -1
br i1 %tmp99, label %bb13, label %bb20.loopexit
bb20.loopexit:
%tmp.0.ph = phi i32 [ 0, %bb18 ], [ 1, %bb15 ], [ 0, %bb13 ]
ret i32 %tmp.0.ph
}
; Indvars should eliminate the icmp here.
define void @func_10() nounwind {
; CHECK-LABEL: @func_10(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: store i64 [[INDVARS_IV]], i64* null, align 8
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: br i1 false, label [[LOOP]], label [[RETURN:%.*]]
; CHECK: return:
; CHECK-NEXT: ret void
;
entry:
br label %loop
loop:
%i = phi i32 [ %i.next, %loop ], [ 0, %entry ]
%t0 = icmp slt i32 %i, 0
%t1 = zext i1 %t0 to i32
%t2 = add i32 %t1, %i
%u3 = zext i32 %t2 to i64
store i64 %u3, i64* null
%i.next = add i32 %i, 1
br i1 undef, label %loop, label %return
return:
ret void
}
; PR14432
; Indvars should not turn the second loop into an infinite one.
define i32 @func_11() nounwind uwtable {
; CHECK-LABEL: @func_11(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FORCOND:%.*]]
; CHECK: forcond:
; CHECK-NEXT: br i1 false, label [[NOASSERT:%.*]], label [[FORCOND38_PREHEADER:%.*]]
; CHECK: forcond38.preheader:
; CHECK-NEXT: br label [[FORCOND38:%.*]]
; CHECK: noassert:
; CHECK-NEXT: br i1 true, label [[FORCOND]], label [[ASSERT33:%.*]]
; CHECK: assert33:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: forcond38:
; CHECK-NEXT: br i1 false, label [[NOASSERT68:%.*]], label [[UNROLLEDEND:%.*]]
; CHECK: noassert68:
; CHECK-NEXT: br i1 true, label [[FORCOND38]], label [[ASSERT77:%.*]]
; CHECK: assert77:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: unrolledend:
; CHECK-NEXT: ret i32 0
;
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp eq i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
define i32 @func_11_flipped() nounwind uwtable {
; CHECK-LABEL: @func_11_flipped(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FORCOND:%.*]]
; CHECK: forcond:
; CHECK-NEXT: br i1 true, label [[FORCOND38_PREHEADER:%.*]], label [[NOASSERT:%.*]]
; CHECK: forcond38.preheader:
; CHECK-NEXT: br label [[FORCOND38:%.*]]
; CHECK: noassert:
; CHECK-NEXT: br i1 true, label [[FORCOND]], label [[ASSERT33:%.*]]
; CHECK: assert33:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: forcond38:
; CHECK-NEXT: br i1 false, label [[NOASSERT68:%.*]], label [[UNROLLEDEND:%.*]]
; CHECK: noassert68:
; CHECK-NEXT: br i1 true, label [[FORCOND38]], label [[ASSERT77:%.*]]
; CHECK: assert77:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: unrolledend:
; CHECK-NEXT: ret i32 0
;
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp sge i32 %__key6.0, 10
br i1 %tmp5, label %forcond38.preheader, label %noassert
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp eq i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @llvm.trap() noreturn nounwind
; In this case the second loop only has a single iteration, fold the header away
define i32 @func_12() nounwind uwtable {
; CHECK-LABEL: @func_12(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FORCOND:%.*]]
; CHECK: forcond:
; CHECK-NEXT: br i1 false, label [[NOASSERT:%.*]], label [[FORCOND38_PREHEADER:%.*]]
; CHECK: forcond38.preheader:
; CHECK-NEXT: br label [[FORCOND38:%.*]]
; CHECK: noassert:
; CHECK-NEXT: br i1 true, label [[FORCOND]], label [[ASSERT33:%.*]]
; CHECK: assert33:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: forcond38:
; CHECK-NEXT: br i1 true, label [[NOASSERT68:%.*]], label [[UNROLLEDEND:%.*]]
; CHECK: noassert68:
; CHECK-NEXT: br i1 false, label [[FORCOND38]], label [[ASSERT77:%.*]]
; CHECK: assert77:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: unrolledend:
; CHECK-NEXT: ret i32 0
;
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp ne i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @side_effect()
define void @func_13(i32* %len.ptr) {
; CHECK-LABEL: @func_13(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], align 4, !range [[RNG0:![0-9]+]]
; CHECK-NEXT: [[LEN_IS_ZERO:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: br i1 [[LEN_IS_ZERO]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
br i1 %len.is.zero, label %leave, label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_14(i32* %len.ptr) {
; CHECK-LABEL: @func_14(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[LEN_IS_ZERO:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: [[LEN_IS_INT_MIN:%.*]] = icmp eq i32 [[LEN]], -2147483648
; CHECK-NEXT: [[NO_ENTRY:%.*]] = or i1 [[LEN_IS_ZERO]], [[LEN_IS_INT_MIN]]
; CHECK-NEXT: br i1 [[NO_ENTRY]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
%len.is.int_min = icmp eq i32 %len, 2147483648
%no.entry = or i1 %len.is.zero, %len.is.int_min
br i1 %no.entry, label %leave, label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp slt i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_15(i32* %len.ptr) {
; CHECK-LABEL: @func_15(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[LEN_ADD_1:%.*]] = add i32 [[LEN]], 1
; CHECK-NEXT: [[LEN_ADD_1_IS_ZERO:%.*]] = icmp eq i32 [[LEN_ADD_1]], 0
; CHECK-NEXT: br i1 [[LEN_ADD_1_IS_ZERO]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN_ADD_1]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.add.1 = add i32 %len, 1
%len.add.1.is.zero = icmp eq i32 %len.add.1, 0
br i1 %len.add.1.is.zero, label %leave, label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len.add.1
br i1 %iv.cmp, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_16(i32* %len.ptr) {
; CHECK-LABEL: @func_16(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[LEN_ADD_5:%.*]] = add i32 [[LEN]], 5
; CHECK-NEXT: [[ENTRY_COND_0:%.*]] = icmp slt i32 [[LEN]], 2147483643
; CHECK-NEXT: [[ENTRY_COND_1:%.*]] = icmp slt i32 4, [[LEN_ADD_5]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = and i1 [[ENTRY_COND_0]], [[ENTRY_COND_1]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: [[TMP0:%.*]] = add nuw nsw i32 [[LEN]], 1
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[TMP0]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.add.5 = add i32 %len, 5
%entry.cond.0 = icmp slt i32 %len, 2147483643
%entry.cond.1 = icmp slt i32 4, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.add.4 = add i32 %iv, 4
%iv.cmp = icmp slt i32 %iv.add.4, %len.add.5
br i1 %iv.cmp, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_17(i32* %len.ptr) {
; CHECK-LABEL: @func_17(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], align 4
; CHECK-NEXT: [[LEN_ADD_5:%.*]] = add i32 [[LEN]], -5
; CHECK-NEXT: [[ENTRY_COND_0:%.*]] = icmp slt i32 [[LEN]], -2147483643
; CHECK-NEXT: [[ENTRY_COND_1:%.*]] = icmp slt i32 -6, [[LEN_ADD_5]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = and i1 [[ENTRY_COND_0]], [[ENTRY_COND_1]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[LEN]], i32 0)
; CHECK-NEXT: [[TMP0:%.*]] = add nsw i32 [[SMAX]], -5
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ -6, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[TMP0]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%len = load i32, i32* %len.ptr
%len.add.5 = add i32 %len, -5
%entry.cond.0 = icmp slt i32 %len, 2147483653 ;; 2147483653 == INT_MIN - (-5)
%entry.cond.1 = icmp slt i32 -6, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
loop:
%iv.2 = phi i32 [ 0, %entry ], [ %iv.2.inc, %be ]
%iv = phi i32 [ -6, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.2.inc = add i32 %iv.2, 1
%iv.cmp = icmp slt i32 %iv, %len.add.5
; Deduces {-5,+,1} s< (-5 + %len) from {0,+,1} < %len
; since %len s< INT_MIN - (-5) from the entry condition
br i1 %iv.cmp, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.2, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define i1 @func_18(i16* %tmp20, i32* %len.addr) {
; CHECK-LABEL: @func_18(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_ADDR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: br i1 [[TMP18]], label [[BB2:%.*]], label [[BB0_PREHEADER:%.*]]
; CHECK: bb0.preheader:
; CHECK-NEXT: br label [[BB0:%.*]]
; CHECK: bb0:
; CHECK-NEXT: [[VAR_0_IN:%.*]] = phi i32 [ [[VAR_0:%.*]], [[BB1:%.*]] ], [ [[LEN]], [[BB0_PREHEADER]] ]
; CHECK-NEXT: [[VAR_1:%.*]] = phi i32 [ [[TMP30:%.*]], [[BB1]] ], [ 0, [[BB0_PREHEADER]] ]
; CHECK-NEXT: [[VAR_0]] = add nsw i32 [[VAR_0_IN]], -1
; CHECK-NEXT: br i1 true, label [[STAY:%.*]], label [[BB2_LOOPEXIT:%.*]]
; CHECK: stay:
; CHECK-NEXT: [[TMP25:%.*]] = getelementptr inbounds i16, i16* [[TMP20:%.*]], i32 [[VAR_1]]
; CHECK-NEXT: [[TMP26:%.*]] = load i16, i16* [[TMP25]], align 2
; CHECK-NEXT: [[TMP29:%.*]] = icmp eq i16 [[TMP26]], 0
; CHECK-NEXT: br i1 [[TMP29]], label [[BB1]], label [[BB2_LOOPEXIT]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP30]] = add nuw i32 [[VAR_1]], 1
; CHECK-NEXT: [[TMP31:%.*]] = icmp eq i32 [[VAR_0]], 0
; CHECK-NEXT: br i1 [[TMP31]], label [[BB3:%.*]], label [[BB0]]
; CHECK: bb2.loopexit:
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: ret i1 false
; CHECK: bb3:
; CHECK-NEXT: ret i1 true
;
entry:
%len = load i32, i32* %len.addr, !range !0
%tmp18 = icmp eq i32 %len, 0
br i1 %tmp18, label %bb2, label %bb0.preheader
bb0.preheader:
br label %bb0
bb0:
%var_0.in = phi i32 [ %var_0, %bb1 ], [ %len, %bb0.preheader ]
%var_1 = phi i32 [ %tmp30, %bb1 ], [ 0, %bb0.preheader ]
%var_0 = add nsw i32 %var_0.in, -1
%tmp23 = icmp ult i32 %var_1, %len
br i1 %tmp23, label %stay, label %bb2
stay:
%tmp25 = getelementptr inbounds i16, i16* %tmp20, i32 %var_1
%tmp26 = load i16, i16* %tmp25
%tmp29 = icmp eq i16 %tmp26, 0
br i1 %tmp29, label %bb1, label %bb2
bb1:
%tmp30 = add i32 %var_1, 1
%tmp31 = icmp eq i32 %var_0, 0
br i1 %tmp31, label %bb3, label %bb0
bb2:
ret i1 false
bb3:
ret i1 true
}
define void @func_19(i32* %length.ptr) {
; CHECK-LABEL: @func_19(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[LENGTH_IS_NONZERO:%.*]] = icmp ne i32 [[LENGTH]], 0
; CHECK-NEXT: br i1 [[LENGTH_IS_NONZERO]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%length = load i32, i32* %length.ptr, !range !0
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
; Like @func_19, but %length is no longer provably positive, so
; %range.check cannot be proved to be always true.
define void @func_20(i32* %length.ptr) {
; CHECK-LABEL: @func_20(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], align 4
; CHECK-NEXT: [[LENGTH_IS_NONZERO:%.*]] = icmp ne i32 [[LENGTH]], 0
; CHECK-NEXT: br i1 [[LENGTH_IS_NONZERO]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[LENGTH]], i32 1)
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND1:%.*]] = icmp ne i32 [[IV_INC]], [[SMAX]]
; CHECK-NEXT: br i1 [[EXITCOND1]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%length = load i32, i32* %length.ptr
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
define void @func_21(i32* %length.ptr) {
; CHECK-LABEL: @func_21(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[LIM:%.*]] = sub i32 [[LENGTH]], 1
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LENGTH]], 1
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LIM]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
define void @func_22(i32* %length.ptr) {
; CHECK-LABEL: @func_22(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LENGTH]], 1
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp sle i32 %iv, %length
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp sle i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_23(i32* %length.ptr) {
; CHECK-LABEL: @func_23(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp ult i32 4, [[LENGTH]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 4, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%length = load i32, i32* %length.ptr, !range !0
%entry.cond = icmp ult i32 4, %length
br i1 %entry.cond, label %loop, label %leave
loop:
%iv = phi i32 [ 4, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_24(i32* %init.ptr) {
; CHECK-LABEL: @func_24(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[INIT:%.*]] = load i32, i32* [[INIT_PTR:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp ugt i32 [[INIT]], 4
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_DEC:%.*]], [[BE:%.*]] ], [ [[INIT]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_DEC]] = add nsw i32 [[IV]], -1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[BE_COND:%.*]] = icmp sgt i32 [[IV_DEC]], 4
; CHECK-NEXT: br i1 [[BE_COND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
%init = load i32, i32* %init.ptr, !range !0
%entry.cond = icmp ugt i32 %init, 4
br i1 %entry.cond, label %loop, label %leave
loop:
%iv = phi i32 [ %init, %entry ], [ %iv.dec, %be ]
%iv.dec = add i32 %iv, -1
%range.check = icmp sgt i32 %iv, 4
br i1 %range.check, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp sgt i32 %iv.dec, 4
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
declare i1 @cond_func()
define i32 @func_25(i32 %start) {
; CHECK-LABEL: @func_25(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[C1:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: br i1 [[C1]], label [[CHECKED_1:%.*]], label [[FAIL:%.*]]
; CHECK: checked.1:
; CHECK-NEXT: br i1 true, label [[CHECKED_2:%.*]], label [[FAIL]]
; CHECK: checked.2:
; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[FAIL]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 758394
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond_func()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: fail:
; CHECK-NEXT: unreachable
; CHECK: exit:
; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA1]]
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%c1 = icmp ne i32 %iv, 0
br i1 %c1, label %checked.1, label %fail
checked.1:
%c2 = icmp ne i32 %iv, 0
br i1 %c2, label %checked.2, label %fail
checked.2:
%c3 = icmp ne i32 %iv, 0
br i1 %c3, label %backedge, label %fail
backedge:
%iv.next = add i32 %iv, 758394
%loop.cond = call i1 @cond_func()
br i1 %loop.cond, label %loop, label %exit
fail:
unreachable
exit:
ret i32 %iv
}
define i32 @func_26(i32 %start) {
; CHECK-LABEL: @func_26(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]