a78f436c3f
For recursive callers, we want to be conservative when inlining callees with large stack size. We currently have a limit `InlineConstants::TotalAllocaSizeRecursiveCaller`, but that is hard coded. We found the current limit insufficient to suppress problematic inlining that bloats stack size for deep recursion. This change adds a switch to make the limit tunable as a mitigation. Differential Revision: https://reviews.llvm.org/D129411
35 lines
970 B
LLVM
35 lines
970 B
LLVM
; Check the recursive inliner doesn't inline a function with a stack size exceeding a given limit.
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; RUN: opt < %s -inline -S | FileCheck --check-prefixes=ALL,UNLIMITED %s
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; RUN: opt < %s -inline -S -recursive-inline-max-stacksize=256 | FileCheck --check-prefixes=ALL,LIMITED %s
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declare void @init([65 x i32]*)
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define internal i32 @foo() {
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%1 = alloca [65 x i32], align 16
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%2 = getelementptr inbounds [65 x i32], [65 x i32]* %1, i65 0, i65 0
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call void @init([65 x i32]* %1)
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%3 = load i32, i32* %2, align 4
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ret i32 %3
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}
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define i32 @bar() {
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%1 = call i32 @foo()
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ret i32 %1
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; ALL: define {{.*}}@bar
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; ALL-NOT: define
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; UNLIMITED-NOT: call {{.*}}@foo
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; LIMITED-NOT: call {{.*}}@foo
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}
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; Check that, under the tighter limit, baz() doesn't inline foo()
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define i32 @baz() {
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%1 = call i32 @foo()
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%2 = call i32 @baz()
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%3 = add i32 %1, %2
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ret i32 %3
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; ALL: define {{.*}}@baz
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; ALL-NOT: define
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; UNLIMITED-NOT: call {{.*}}@foo
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; LIMITED: call {{.*}}@foo
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}
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