76 lines
2.9 KiB
LLVM
76 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -passes=loop-idiom < %s | FileCheck %s
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; Make sure that any inserted LCSSA phi nodes are removed if the transform
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; is aborted.
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define void @test() {
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; CHECK-LABEL: define void @test() {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ALLOCA:%.*]] = alloca [64 x i8], align 16
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[PHI:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ 1, [[LOOP_LATCH:%.*]] ]
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; CHECK-NEXT: br i1 false, label [[LOOP_EXIT2:%.*]], label [[LOOP_LATCH]]
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; CHECK: loop.latch:
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; CHECK-NEXT: [[OR:%.*]] = or i64 [[PHI]], 4
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; CHECK-NEXT: br i1 false, label [[LOOP_EXIT:%.*]], label [[LOOP]]
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; CHECK: loop.exit:
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; CHECK-NEXT: [[OR_LCSSA:%.*]] = phi i64 [ [[OR]], [[LOOP_LATCH]] ]
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; CHECK-NEXT: br label [[LOOP2_PREHEADER:%.*]]
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; CHECK: loop.exit2:
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; CHECK-NEXT: br label [[LOOP2_PREHEADER]]
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; CHECK: loop2.preheader:
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; CHECK-NEXT: [[PHI5_PH:%.*]] = phi ptr [ null, [[LOOP_EXIT2]] ], [ [[ALLOCA]], [[LOOP_EXIT]] ]
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; CHECK-NEXT: [[PHI6_PH:%.*]] = phi i64 [ 0, [[LOOP_EXIT2]] ], [ [[OR_LCSSA]], [[LOOP_EXIT]] ]
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; CHECK-NEXT: br label [[LOOP2:%.*]]
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; CHECK: loop2:
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; CHECK-NEXT: [[PHI5:%.*]] = phi ptr [ [[GETELEMENTPTR7:%.*]], [[LOOP2]] ], [ [[PHI5_PH]], [[LOOP2_PREHEADER]] ]
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; CHECK-NEXT: [[PHI6:%.*]] = phi i64 [ [[ADD:%.*]], [[LOOP2]] ], [ [[PHI6_PH]], [[LOOP2_PREHEADER]] ]
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; CHECK-NEXT: [[GETELEMENTPTR:%.*]] = getelementptr i8, ptr [[ALLOCA]], i64 [[PHI6]]
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; CHECK-NEXT: [[LOAD:%.*]] = load i8, ptr [[GETELEMENTPTR]], align 1
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; CHECK-NEXT: store i8 [[LOAD]], ptr [[PHI5]], align 1
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; CHECK-NEXT: [[GETELEMENTPTR7]] = getelementptr i8, ptr [[PHI5]], i64 1
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; CHECK-NEXT: [[ADD]] = add i64 [[PHI6]], 1
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; CHECK-NEXT: [[ICMP:%.*]] = icmp eq i64 [[PHI6]], 0
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; CHECK-NEXT: br i1 [[ICMP]], label [[LOOP2_EXIT:%.*]], label [[LOOP2]]
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; CHECK: loop2.exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%alloca = alloca [64 x i8], align 16
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br label %loop
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loop:
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%phi = phi i64 [ 0, %entry ], [ 1, %loop.latch ]
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br i1 false, label %loop.exit2, label %loop.latch
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loop.latch:
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%or = or i64 %phi, 4
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br i1 false, label %loop.exit, label %loop
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loop.exit:
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br label %loop2.preheader
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loop.exit2:
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br label %loop2.preheader
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loop2.preheader:
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%phi5.ph = phi ptr [ null, %loop.exit2 ], [ %alloca, %loop.exit ]
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%phi6.ph = phi i64 [ 0, %loop.exit2 ], [ %or, %loop.exit ]
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br label %loop2
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loop2:
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%phi5 = phi ptr [ %getelementptr7, %loop2 ], [ %phi5.ph, %loop2.preheader ]
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%phi6 = phi i64 [ %add, %loop2 ], [ %phi6.ph, %loop2.preheader ]
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%getelementptr = getelementptr i8, ptr %alloca, i64 %phi6
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%load = load i8, ptr %getelementptr, align 1
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store i8 %load, ptr %phi5, align 1
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%getelementptr7 = getelementptr i8, ptr %phi5, i64 1
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%add = add i64 %phi6, 1
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%icmp = icmp eq i64 %phi6, 0
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br i1 %icmp, label %loop2.exit, label %loop2
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loop2.exit:
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ret void
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}
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