derek.holloway
7502bf64a4
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84 lines
2.2 KiB
LLVM
84 lines
2.2 KiB
LLVM
; RUN: opt -passes=called-value-propagation -S < %s | FileCheck %s
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target triple = "aarch64"
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; This test checks that we propagate the functions through arguments and attach
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; !callees metadata to the call. Such metadata can enable optimizations of this
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; code sequence.
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;
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; For example, the code below a illustrates a contrived sort-like algorithm
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; that accepts a pointer to a comparison function. Since the indirect call to
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; the comparison function has only two targets, the call can be promoted to two
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; direct calls using an if-then-else. The loop can then be unswitched and the
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; called functions inlined. This essentially produces two loops, once
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; specialized for each comparison.
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;
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; CHECK: %tmp3 = call i1 %cmp(ptr %tmp1, ptr %tmp2), !callees ![[MD:[0-9]+]]
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; CHECK: ![[MD]] = !{ptr @ugt, ptr @ule}
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;
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define void @test_argument(ptr %x, i64 %n, i1 %flag) {
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entry:
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%tmp0 = sub i64 %n, 1
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br i1 %flag, label %then, label %else
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then:
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call void @arrange_data(ptr %x, i64 %tmp0, ptr @ugt)
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br label %merge
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else:
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call void @arrange_data(ptr %x, i64 %tmp0, ptr @ule)
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br label %merge
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merge:
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ret void
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}
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define internal void @arrange_data(ptr %x, i64 %n, ptr %cmp) {
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entry:
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%tmp0 = icmp eq i64 %n, 1
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br i1 %tmp0, label %merge, label %for.body
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for.body:
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%i = phi i64 [ 0, %entry ], [ %i.next, %cmp.false ]
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%i.next = add nuw nsw i64 %i, 1
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%tmp1 = getelementptr inbounds i64, ptr %x, i64 %i
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%tmp2 = getelementptr inbounds i64, ptr %x, i64 %i.next
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%tmp3 = call i1 %cmp(ptr %tmp1, ptr %tmp2)
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br i1 %tmp3, label %cmp.true, label %cmp.false
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cmp.true:
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call void @swap(ptr %tmp1, ptr %tmp2)
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br label %cmp.false
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cmp.false:
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%cond = icmp slt i64 %i.next, %n
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br i1 %cond, label %for.body, label %for.end
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for.end:
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%tmp4 = sub i64 %n, 1
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call void @arrange_data(ptr %x, i64 %tmp4, ptr %cmp)
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br label %merge
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merge:
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ret void
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}
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define internal i1 @ugt(ptr %a, ptr %b) {
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entry:
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%tmp0 = load i64, ptr %a
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%tmp1 = load i64, ptr %b
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%tmp2 = icmp ugt i64 %tmp0, %tmp1
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ret i1 %tmp2
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}
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define internal i1 @ule(ptr %a, ptr %b) {
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entry:
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%tmp0 = load i64, ptr %a
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%tmp1 = load i64, ptr %b
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%tmp2 = icmp ule i64 %tmp0, %tmp1
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ret i1 %tmp2
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}
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declare void @swap(ptr, ptr)
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