97 lines
3.4 KiB
LLVM
97 lines
3.4 KiB
LLVM
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; RUN: opt -S -gvn-hoist < %s | FileCheck %s
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; Checking gvn-hoist in case of infinite loops and irreducible control flow.
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; Check that bitcast is not hoisted beacuse down safety is not guaranteed.
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; CHECK-LABEL: @bazv1
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; CHECK: if.then.i:
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; CHECK: bitcast
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; CHECK-NEXT: load
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; CHECK: if.then4.i:
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; CHECK: bitcast
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; CHECK-NEXT: load
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%class.bar = type { i8*, %class.base* }
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%class.base = type { i32 (...)** }
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; Function Attrs: noreturn nounwind uwtable
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define void @bazv1() local_unnamed_addr {
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entry:
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%agg.tmp = alloca %class.bar, align 8
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%x.sroa.2.0..sroa_idx2 = getelementptr inbounds %class.bar, %class.bar* %agg.tmp, i64 0, i32 1
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store %class.base* null, %class.base** %x.sroa.2.0..sroa_idx2, align 8
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call void @_Z3foo3bar(%class.bar* nonnull %agg.tmp)
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%0 = load %class.base*, %class.base** %x.sroa.2.0..sroa_idx2, align 8
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%1 = bitcast %class.bar* %agg.tmp to %class.base*
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%cmp.i = icmp eq %class.base* %0, %1
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br i1 %cmp.i, label %if.then.i, label %if.else.i
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if.then.i: ; preds = %entry
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%2 = bitcast %class.base* %0 to void (%class.base*)***
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%vtable.i = load void (%class.base*)**, void (%class.base*)*** %2, align 8
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%vfn.i = getelementptr inbounds void (%class.base*)*, void (%class.base*)** %vtable.i, i64 2
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%3 = load void (%class.base*)*, void (%class.base*)** %vfn.i, align 8
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call void %3(%class.base* %0)
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br label %while.cond.preheader
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if.else.i: ; preds = %entry
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%tobool.i = icmp eq %class.base* %0, null
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br i1 %tobool.i, label %while.cond.preheader, label %if.then4.i
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if.then4.i: ; preds = %if.else.i
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%4 = bitcast %class.base* %0 to void (%class.base*)***
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%vtable6.i = load void (%class.base*)**, void (%class.base*)*** %4, align 8
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%vfn7.i = getelementptr inbounds void (%class.base*)*, void (%class.base*)** %vtable6.i, i64 3
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%5 = load void (%class.base*)*, void (%class.base*)** %vfn7.i, align 8
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call void %5(%class.base* nonnull %0)
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br label %while.cond.preheader
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while.cond.preheader: ; preds = %if.then.i, %if.else.i, %if.then4.i
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br label %while.cond
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while.cond: ; preds = %while.cond.preheader, %while.cond
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%call = call i32 @sleep(i32 10)
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br label %while.cond
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}
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declare void @_Z3foo3bar(%class.bar*) local_unnamed_addr
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declare i32 @sleep(i32) local_unnamed_addr
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; Check that the load is hoisted even if it is inside an irreducible control flow
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; because the load is anticipable on all paths.
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; CHECK-LABEL: @bazv
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; CHECK: bb2:
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; CHECK-NOT: load
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; CHECK-NOT: bitcast
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define void @bazv() {
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entry:
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%agg.tmp = alloca %class.bar, align 8
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%x= getelementptr inbounds %class.bar, %class.bar* %agg.tmp, i64 0, i32 1
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%0 = load %class.base*, %class.base** %x, align 8
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%1 = bitcast %class.bar* %agg.tmp to %class.base*
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%cmp.i = icmp eq %class.base* %0, %1
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br i1 %cmp.i, label %bb1, label %bb4
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bb1:
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%b1 = bitcast %class.base* %0 to void (%class.base*)***
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%i = load void (%class.base*)**, void (%class.base*)*** %b1, align 8
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%vfn.i = getelementptr inbounds void (%class.base*)*, void (%class.base*)** %i, i64 2
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%cmp.j = icmp eq %class.base* %0, %1
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br i1 %cmp.j, label %bb2, label %bb3
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bb2:
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%l1 = load void (%class.base*)*, void (%class.base*)** %vfn.i, align 8
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br label %bb3
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bb3:
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%l2 = load void (%class.base*)*, void (%class.base*)** %vfn.i, align 8
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br label %bb2
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bb4:
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%b2 = bitcast %class.base* %0 to void (%class.base*)***
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ret void
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}
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