derek.holloway
7502bf64a4
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100 lines
2.3 KiB
LLVM
100 lines
2.3 KiB
LLVM
; RUN: opt -passes=licm < %s -S | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<target-ir>,require<scalar-evolution>,require<opt-remark-emit>,loop-mssa(licm)' < %s -S | FileCheck %s
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define void @f_0(i1 %p, i1 %arg) nounwind ssp {
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; CHECK-LABEL: @f_0(
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entry:
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br label %for.body
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for.body:
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br i1 %arg, label %if.then, label %for.cond.backedge
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for.cond.backedge:
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br i1 %arg, label %for.end104, label %for.body
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if.then:
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br i1 %arg, label %if.then27, label %if.end.if.end.split_crit_edge.critedge
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if.then27:
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; CHECK: tail call void @llvm.assume
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tail call void @llvm.assume(i1 %p)
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br label %for.body61.us
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if.end.if.end.split_crit_edge.critedge:
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br label %for.body61
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for.body61.us:
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br i1 %arg, label %for.cond.backedge, label %for.body61.us
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for.body61:
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br i1 %arg, label %for.cond.backedge, label %for.body61
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for.end104:
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ret void
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}
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define void @f_1(i1 %cond, ptr %ptr) {
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; CHECK-LABEL: @f_1(
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; CHECK-LABEL: entry:
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; CHECK: call void @llvm.assume(i1 %cond)
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; CHECK: %val = load i32, ptr %ptr
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; CHECK-LABEL: loop:
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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call void @llvm.assume(i1 %cond)
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%val = load i32, ptr %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; Can't hoist because the call may throw and the assume
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; may never execute.
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define void @f_2(i1 %cond, ptr %ptr) {
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; CHECK-LABEL: @f_2(
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; CHECK-LABEL: entry:
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; CHECK-LABEL: loop:
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; CHECK: call void @llvm.assume(i1 %cond)
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; CHECK: %val = load i32, ptr %ptr
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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call void @maythrow()
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call void @llvm.assume(i1 %cond)
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%val = load i32, ptr %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; Note: resulting loop could be peeled and then hoisted, but
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; by default assume is captured in phi cycle.
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define void @f_3(i1 %cond, ptr %ptr) {
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; CHECK-LABEL: @f_3(
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; CHECK-LABEL: entry:
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; CHECK: %val = load i32, ptr %ptr
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; CHECK-LABEL: loop:
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; CHECK: call void @llvm.assume(i1 %x.cmp)
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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%x.cmp = phi i1 [%cond, %entry], [%cond.next, %loop]
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call void @llvm.assume(i1 %x.cmp)
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%val = load i32, ptr %ptr
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%cond.next = icmp eq i32 %val, 5
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%x.inc = add i32 %x, %val
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br label %loop
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}
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declare void @maythrow()
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declare void @llvm.assume(i1)
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