5c97507e2b
This patch introduces four new string attributes: function-inline-cost, function-inline-threshold, call-inline-cost and call-threshold-bonus. These attributes allow you to selectively override some aspects of InlineCost analysis. That would allow us to test inliner separately from the InlineCost analysis. That could be useful when you're trying to write tests for inliner and you need to test some very specific situation, like "the inline cost has to be this high", or "the threshold has to be this low". Right now every time someone does that, they have get creative to come up with a way to make the InlineCost give them the number they need (like adding ~30 load/add pairs for a trivial test). This process can be somewhat tedious which can discourage some people from writing enough tests for their changes. Also, that results in tests that are fragile and can be easily broken without anyone noticing it because the test writer can't explicitly control what input the inliner will get from the inline cost analysis. These new attributes will alleviate those problems to an extent. Reviewed By: mtrofin Differential Revision: https://reviews.llvm.org/D109033
54 lines
2.0 KiB
LLVM
54 lines
2.0 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -inline-cost-full -passes='cgscc(inline)' -debug-only=inline -disable-output %s 2>&1 | FileCheck --check-prefix=INLINER %s
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; RUN: opt -inline-cost-full -passes='print<inline-cost>' -disable-output %s 2>&1 | FileCheck --check-prefix=COST %s
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declare void @extern() "call-threshold-bonus"="31"
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define void @fn1() "function-inline-cost"="321" "function-inline-threshold"="123" "call-inline-cost"="271" {
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entry:
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ret void
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}
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define void @fn2() "function-inline-threshold"="41" {
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; INLINER-LABEL: Inlining calls in: fn2
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; INLINER-NEXT: Function size: 6
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; INLINER-NEXT: NOT Inlining (cost=321, threshold=123), Call: call void @fn1()
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; INLINER-NEXT: NOT Inlining (cost=321, threshold=321), Call: call void @fn1()
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; INLINER-NEXT: NOT Inlining (cost=197, threshold=123), Call: call void @fn1()
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; INLINER-NEXT: Inlining (cost=197, threshold=321), Call: call void @fn1()
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; COST-LABEL: define void @fn2()
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; COST-NEXT: entry:
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; COST-NEXT: threshold delta = 31
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; COST-NEXT: call void @extern()
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; COST-NEXT: cost delta = 132, threshold delta = 193
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; COST-NEXT: call void @fn1()
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; COST-NEXT: cost delta = 0
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; COST-NEXT: call void @fn1()
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; COST-NEXT: cost delta = 271, threshold delta = 17
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; COST-NEXT: call void @fn1()
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; COST-NEXT: cost delta = 473
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; COST-NEXT: call void @fn1()
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entry:
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call void @extern()
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call void @fn1() "call-inline-cost"="132" "call-threshold-bonus"="193"
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call void @fn1() "call-inline-cost"="0" "function-inline-threshold"="321"
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call void @fn1() "call-threshold-bonus"="17" "function-inline-cost"="197"
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call void @fn1() "call-inline-cost"="473" "function-inline-cost"="197" "function-inline-threshold"="321"
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ret void
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}
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define void @fn3() {
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; INLINER-LABEL: Inlining calls in: fn3
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; INLINER-NEXT: Function size: 3
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; INLINER-NEXT: Inlining (cost=386, threshold=849), Call: call void @fn1()
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; INLINER-NEXT: Size after inlining: 2
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; INLINER-NEXT: NOT Inlining (cost=403, threshold=41), Call: call void @fn2()
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entry:
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call void @fn1() "function-inline-cost"="386" "function-inline-threshold"="849"
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call void @fn2()
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ret void
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}
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