82 lines
2.1 KiB
LLVM
82 lines
2.1 KiB
LLVM
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; RUN: llc -mcpu=v2 -march=bpf < %s | FileCheck %s
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; RUN: llc -mcpu=v4 -march=bpf < %s | FileCheck %s
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; Zero extension instructions should be eliminated at instruction
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; selection phase for all test cases below.
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; In BPF zero extension is implemented as &= or a pair of <<=/>>=
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; instructions, hence simply check that &= and >>= do not exist in
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; generated code (<<= remains because %c is used by both call and
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; lshr in a few test cases).
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; CHECK-NOT: &=
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; CHECK-NOT: >>=
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define void @shl_lshr_same_bb(ptr %p) {
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entry:
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%a = load i8, ptr %p, align 1
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%b = zext i8 %a to i64
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%c = shl i64 %b, 56
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%d = lshr i64 %c, 56
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%e = icmp eq i64 %d, 0
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; hasOneUse() is a common requirement for many CombineDAG
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; transofmations, make sure that it does not matter in this case.
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call void @sink1(i8 %a, i64 %b, i64 %c, i64 %d, i1 %e)
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ret void
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}
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define void @shl_lshr_diff_bb(ptr %p) {
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entry:
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%a = load i16, ptr %p, align 2
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%b = zext i16 %a to i64
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%c = shl i64 %b, 48
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%d = lshr i64 %c, 48
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br label %next
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; Jump to the new basic block creates a COPY instruction for %d, which
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; might be materialized as noop or as AND_ri (zero extension) at the
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; start of the basic block. The decision depends on TLI.isZExtFree()
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; results, see RegsForValue::getCopyToRegs(). Check below verifies
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; that COPY is materialized as noop.
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next:
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%e = icmp eq i64 %d, 0
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call void @sink2(i16 %a, i64 %b, i64 %c, i64 %d, i1 %e)
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ret void
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}
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define void @load_zext_same_bb(ptr %p) {
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entry:
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%a = load i8, ptr %p, align 1
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; zext is implicit in this context
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%b = icmp eq i8 %a, 0
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call void @sink3(i8 %a, i1 %b)
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ret void
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}
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define void @load_zext_diff_bb(ptr %p) {
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entry:
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%a = load i8, ptr %p, align 1
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br label %next
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next:
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%b = icmp eq i8 %a, 0
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call void @sink3(i8 %a, i1 %b)
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ret void
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}
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define void @load_zext_diff_bb_2(ptr %p) {
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entry:
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%a = load i32, ptr %p, align 4
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br label %next
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next:
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%b = icmp eq i32 %a, 0
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call void @sink4(i32 %a, i1 %b)
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ret void
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}
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declare void @sink1(i8, i64, i64, i64, i1);
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declare void @sink2(i16, i64, i64, i64, i1);
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declare void @sink3(i8, i1);
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declare void @sink4(i32, i1);
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