; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=indvars -indvars-predicate-loops=0 < %s | FileCheck %s
; Check that we don't reuse %zext instead of %inc11 for LCSSA Phi node. Case
; with constants SCEV.
define i32 @test_01() {
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND1_PREHEADER:%.*]]
; CHECK: for.cond1.preheader:
; CHECK-NEXT: br label [[FOR_COND4_PREHEADER:%.*]]
; CHECK: for.cond4.preheader:
; CHECK-NEXT: [[ZEXT:%.*]] = zext i16 1 to i32
; CHECK-NEXT: br label [[FOR_BODY6:%.*]]
; CHECK: for.cond4:
; CHECK-NEXT: br i1 true, label [[FOR_BODY6]], label [[FOR_END:%.*]]
; CHECK: for.body6:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[FOR_COND4_PREHEADER]] ], [ [[INC:%.*]], [[FOR_COND4:%.*]] ]
; CHECK-NEXT: [[TMP0:%.*]] = icmp eq i32 [[IV]], [[ZEXT]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 [[TMP0]], label [[RETURN_LOOPEXIT:%.*]], label [[FOR_COND4]]
; CHECK: for.end:
; CHECK-NEXT: br i1 false, label [[FOR_COND4_PREHEADER]], label [[FOR_END9:%.*]]
; CHECK: for.end9:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_PREHEADER]], label [[RETURN_LOOPEXIT3:%.*]]
; CHECK: return.loopexit:
; CHECK-NEXT: unreachable
; CHECK: return.loopexit3:
; CHECK-NEXT: br label [[RETURN:%.*]]
; CHECK: return:
; CHECK-NEXT: ret i32 1
;
entry:
br label %for.cond1.preheader
for.cond1.preheader: ; preds = %for.end9, %entry
br label %for.cond4.preheader
for.cond4.preheader: ; preds = %for.end, %for.cond1.preheader
%zext = zext i16 1 to i32
br label %for.body6
for.cond4: ; preds = %for.body6
%cmp5 = icmp ult i32 %inc, 2
br i1 %cmp5, label %for.body6, label %for.end
for.body6: ; preds = %for.cond4, %for.cond4.preheader
%iv = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.cond4 ]
%0 = icmp eq i32 %iv, %zext
%inc = add nuw nsw i32 %iv, 1
br i1 %0, label %return.loopexit, label %for.cond4
for.end: ; preds = %for.cond4
br i1 false, label %for.cond4.preheader, label %for.end9
for.end9: ; preds = %for.end
%inc11 = add nuw nsw i32 0, 1
br i1 false, label %for.cond1.preheader, label %return.loopexit3
return.loopexit: ; preds = %for.body6
unreachable
return.loopexit3: ; preds = %for.end9
%inc11.lcssa = phi i32 [ %inc11, %for.end9 ]
br label %return
return: ; preds = %return.loopexit3
ret i32 %inc11.lcssa
}
; Same as test_01, but the instructions with the same SCEV have a non-constant
; SCEV.
define i32 @test_02(i32 %x) {
; CHECK-LABEL: @test_02(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND1_PREHEADER:%.*]]
; CHECK: for.cond1.preheader:
; CHECK-NEXT: br label [[FOR_COND4_PREHEADER:%.*]]
; CHECK: for.cond4.preheader:
; CHECK-NEXT: [[ZEXT:%.*]] = mul i32 [[X:%.*]], 1
; CHECK-NEXT: br label [[FOR_BODY6:%.*]]
; CHECK: for.cond4:
; CHECK-NEXT: [[CMP5:%.*]] = icmp ult i32 [[INC:%.*]], 2
; CHECK-NEXT: br i1 [[CMP5]], label [[FOR_BODY6]], label [[FOR_END:%.*]]
; CHECK: for.body6:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[FOR_COND4_PREHEADER]] ], [ [[INC]], [[FOR_COND4:%.*]] ]
; CHECK-NEXT: [[TMP0:%.*]] = icmp eq i32 [[IV]], [[ZEXT]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 [[TMP0]], label [[RETURN_LOOPEXIT:%.*]], label [[FOR_COND4]]
; CHECK: for.end:
; CHECK-NEXT: br i1 false, label [[FOR_COND4_PREHEADER]], label [[FOR_END9:%.*]]
; CHECK: for.end9:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_PREHEADER]], label [[RETURN_LOOPEXIT3:%.*]]
; CHECK: return.loopexit:
; CHECK-NEXT: unreachable
; CHECK: return.loopexit3:
; CHECK-NEXT: br label [[RETURN:%.*]]
; CHECK: return:
; CHECK-NEXT: ret i32 [[X]]
;
entry:
br label %for.cond1.preheader
for.cond1.preheader: ; preds = %for.end9, %entry
br label %for.cond4.preheader
for.cond4.preheader: ; preds = %for.end, %for.cond1.preheader
%zext = mul i32 %x, 1
br label %for.body6
for.cond4: ; preds = %for.body6
%cmp5 = icmp ult i32 %inc, 2
br i1 %cmp5, label %for.body6, label %for.end
for.body6: ; preds = %for.cond4, %for.cond4.preheader
%iv = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.cond4 ]
%0 = icmp eq i32 %iv, %zext
%inc = add nuw nsw i32 %iv, 1
br i1 %0, label %return.loopexit, label %for.cond4
for.end: ; preds = %for.cond4
br i1 false, label %for.cond4.preheader, label %for.end9
for.end9: ; preds = %for.end
%inc11 = add nuw nsw i32 0, %x
br i1 false, label %for.cond1.preheader, label %return.loopexit3
return.loopexit: ; preds = %for.body6
unreachable
return.loopexit3: ; preds = %for.end9
%inc11.lcssa = phi i32 [ %inc11, %for.end9 ]
br label %return
return: ; preds = %return.loopexit3
ret i32 %inc11.lcssa
}
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