derek.holloway
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50 lines
1.3 KiB
LLVM
50 lines
1.3 KiB
LLVM
; RUN: opt -S -passes=inline %s -debug-only=inline-cost 2>&1 | FileCheck %s
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; REQUIRES: asserts
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@a = global i32 4
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; Only the load and ret should be included in the instruction count, not
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; the instructions feeding the assume.
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; CHECK: Analyzing call of inner...
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; CHECK: NumInstructions: 2
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define i32 @inner(ptr %y) {
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%a1 = load volatile i32, ptr @a
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; Because these instructions are used only by the @llvm.assume intrinsic,
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; they're free and should not be included in the instruction count when
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; computing the inline cost.
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%a2 = mul i32 %a1, %a1
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%a3 = sub i32 %a1, %a2
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%a4 = udiv i32 %a3, -13
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%a5 = mul i32 %a4, %a4
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%a6 = add i32 %a5, %a5
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%ca = icmp sgt i32 %a6, -7
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%r = call i1 @llvm.type.test(ptr %y, metadata !0)
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%ca2 = icmp eq i1 %ca, %r
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tail call void @llvm.assume(i1 %ca2)
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ret i32 %a1
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}
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; Only the ret should be included in the instruction count, the load and icmp
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; are both ephemeral.
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; CHECK: Analyzing call of inner2...
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; CHECK: NumInstructions: 1
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define void @inner2(ptr %y) {
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%v = load i8, ptr %y
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%c = icmp eq i8 %v, 42
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call void @llvm.assume(i1 %c)
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ret void
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}
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define i32 @outer(ptr %y) optsize {
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%r = call i32 @inner(ptr %y)
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call void @inner2(ptr %y)
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ret i32 %r
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}
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declare void @llvm.assume(i1) nounwind
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declare i1 @llvm.type.test(ptr, metadata) nounwind readnone
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!0 = !{i32 0, !"typeid1"}
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