52 lines
2 KiB
LLVM
52 lines
2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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; RUN: opt -S -loop-predication-skip-profitability-checks=false -passes='require<scalar-evolution>,loop-mssa(loop-predication)' %s | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nocallback nofree nosync willreturn
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declare void @llvm.experimental.guard(i1, ...) #0
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; Check that LoopPredication doesn't crash on all-zero branch weights
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define void @foo() {
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; CHECK-LABEL: define void @foo() {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[HEADER:%.*]]
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; CHECK: Header:
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; CHECK-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[J_NEXT:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false, i32 0) [ "deopt"() ]
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; CHECK-NEXT: [[J_NEXT]] = add i64 [[J2]], 1
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; CHECK-NEXT: br i1 false, label [[LATCH]], label [[EXIT:%.*]]
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; CHECK: Latch:
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; CHECK-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J2]], 0
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; CHECK-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[COMMON_RET_LOOPEXIT:%.*]], !prof [[PROF0:![0-9]+]]
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; CHECK: common.ret.loopexit:
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: ret void
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; CHECK: exit:
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; CHECK-NEXT: br label [[COMMON_RET]]
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;
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entry:
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br label %Header
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Header: ; preds = %Latch, %entry
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%j2 = phi i64 [ 0, %entry ], [ %j.next, %Latch ]
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call void (i1, ...) @llvm.experimental.guard(i1 false, i32 0) [ "deopt"() ]
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%j.next = add i64 %j2, 1
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br i1 false, label %Latch, label %exit
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Latch: ; preds = %Header
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%speculate_trip_count = icmp ult i64 %j2, 0
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br i1 %speculate_trip_count, label %Header, label %common.ret, !prof !0
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common.ret: ; preds = %exit, %Latch
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ret void
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exit: ; preds = %Header
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br label %common.ret
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}
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attributes #0 = { nocallback nofree nosync willreturn }
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!0 = !{!"branch_weights", i32 0, i32 0}
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