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[Test] Add test for miscompile described in PR57247
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py | ||
; RUN: opt -S -passes=indvars < %s | FileCheck %s | ||
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; We must NOT replace check against IV with check against invariant 0. It should fail. | ||
define i32 @test() { | ||
; CHECK-LABEL: @test( | ||
; CHECK-NEXT: entry: | ||
; CHECK-NEXT: br label [[OUTER_LOOP:%.*]] | ||
; CHECK: outer.loop: | ||
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ] | ||
; CHECK-NEXT: [[CHECK_1:%.*]] = icmp ult i32 [[IV]], 2 | ||
; CHECK-NEXT: br label [[INNER_LOOP:%.*]] | ||
; CHECK: inner.loop: | ||
; CHECK-NEXT: [[STOREMERGE611_I:%.*]] = phi i64 [ 0, [[OUTER_LOOP]] ], [ [[ADD_I:%.*]], [[INNER_LATCH:%.*]] ] | ||
; CHECK-NEXT: br i1 [[CHECK_1]], label [[INNER_LATCH]], label [[EXIT:%.*]] | ||
; CHECK: inner.latch: | ||
; CHECK-NEXT: [[ADD_I]] = add nuw nsw i64 [[STOREMERGE611_I]], 1 | ||
; CHECK-NEXT: [[CMP5_I:%.*]] = icmp ult i64 [[STOREMERGE611_I]], 11 | ||
; CHECK-NEXT: br i1 [[CMP5_I]], label [[INNER_LOOP]], label [[OUTER_LATCH]] | ||
; CHECK: outer.latch: | ||
; CHECK-NEXT: [[IV_NEXT]] = add nsw i32 [[IV]], -1 | ||
; CHECK-NEXT: br label [[OUTER_LOOP]] | ||
; CHECK: exit: | ||
; CHECK-NEXT: [[IV_LCSSA:%.*]] = phi i32 [ [[IV]], [[INNER_LOOP]] ] | ||
; CHECK-NEXT: ret i32 [[IV_LCSSA]] | ||
; | ||
entry: | ||
br label %outer.loop | ||
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outer.loop: ; preds = %outer.latch, %entry | ||
%iv = phi i32 [ 0, %entry ], [ %iv.next, %outer.latch ] | ||
%check_1 = icmp ult i32 %iv, 2 | ||
br label %inner.loop | ||
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inner.loop: ; preds = %inner.latch, %outer.loop | ||
%storemerge611.i = phi i64 [ 0, %outer.loop ], [ %add.i, %inner.latch ] | ||
br i1 %check_1, label %inner.latch, label %exit | ||
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inner.latch: ; preds = %inner.loop | ||
%add.i = add i64 %storemerge611.i, 1 | ||
%cmp5.i = icmp ult i64 %storemerge611.i, 11 | ||
br i1 %cmp5.i, label %inner.loop, label %outer.latch | ||
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outer.latch: ; preds = %inner.latch | ||
%iv.next = add i32 %iv, -1 | ||
br label %outer.loop | ||
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exit: ; preds = %inner.loop | ||
ret i32 %iv | ||
} |