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[Statepoints] Check for the "gc-leaf-function" attribute on call sites as well.

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Reviewers: sanjoy, reames

Subscribers: sanjoy, llvm-commits

Differential Revision: http://reviews.llvm.org/D15900

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256875 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manuel Jacob 2016-01-05 23:59:08 +00:00
parent d79ef021fe
commit 7b845c18db
2 changed files with 13 additions and 2 deletions
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4
lib/Transforms/Utils/Local.cpp
View File

@ -1553,8 +1553,8 @@ bool llvm::callsGCLeafFunction(ImmutableCallSite CS) {
return true;
// Check if the function is specifically marked as a gc leaf function.
//
// TODO: we should be checking the attributes on the call site as well.
if (CS.hasFnAttr("gc-leaf-function"))
return true;
if (const Function *F = CS.getCalledFunction())
return F->hasFnAttribute("gc-leaf-function");

11
test/Transforms/PlaceSafepoints/leaf-function.ll
View File

@ -1,6 +1,7 @@
; RUN: opt %s -S -place-safepoints | FileCheck %s
declare void @foo() "gc-leaf-function"
declare void @bar()
; Calls of functions with the "gc-leaf-function" attribute shouldn't be turned
; into a safepoint. An entry safepoint should get inserted, though.
@ -14,6 +15,16 @@ entry:
ret void
}
define void @test_leaf_function_call() gc "statepoint-example" {
; CHECK-LABEL: test_leaf_function_call
; CHECK: gc.statepoint.p0f_isVoidf
; CHECK-NOT: statepoint
; CHECK-NOT: gc.result
entry:
call void @bar() "gc-leaf-function"
ret void
}
; This function is inlined when inserting a poll.
declare void @do_safepoint()
define void @gc.safepoint_poll() {