derek.holloway
7502bf64a4
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47 lines
1.8 KiB
LLVM
47 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=correlated-propagation -S %s | FileCheck %s
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; Check that shift is not removed by CVP because of incorrect range returned by LVI::getConstantRangeAtUse.
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; https://github.com/llvm/llvm-project/issues/60629
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define i32 @test(i32 %arg) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 127, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[DO_SHIFT:%.*]] ]
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; CHECK-NEXT: [[SHIFTED_IV:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SHIFT:%.*]], [[DO_SHIFT]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp sgt i32 [[IV]], 127
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[EXIT:%.*]], label [[DO_SHIFT]]
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; CHECK: do.shift:
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; CHECK-NEXT: [[SHIFT]] = ashr i32 [[IV]], [[ARG:%.*]]
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[RETVAL:%.*]] = phi i32 [ 0, [[BB1:%.*]] ], [ [[SHIFTED_IV]], [[LOOP]] ]
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; CHECK-NEXT: ret i32 [[RETVAL]]
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;
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entry:
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br label %loop
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loop: ; preds = %do.shift, %entry
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%iv = phi i32 [ 127, %entry ], [ %iv.next, %do.shift ]
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%shifted.iv = phi i32 [ 0, %entry ], [ %shift, %do.shift ]
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%iv.next = add i32 %iv, 1
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%loop_cond = icmp sgt i32 %iv, 127
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br i1 %loop_cond, label %exit, label %do.shift
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do.shift: ; preds = %loop
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%shift = ashr i32 %iv, %arg
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br label %loop
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bb1: ; No predecessors!
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br label %exit
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exit: ; preds = %loop, %bb1
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%retval = phi i32 [ 0, %bb1 ], [ %shifted.iv, %loop ]
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ret i32 %retval
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}
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