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[PlaceSafepoints] Assertion on that gc_result can not have preceding phis should only apply to invoke statepoint

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Summary: When PlaceSafepoints pass replaces old return result with gc_result from statepoint, it asserts that gc_result can not have preceding phis in its parent block. This is only true on invoke statepoint, which terminates the block and puts its result at the beginning of the normal successor block. Call statepoint does not terminate the block and thus its result is in the same block with it. There should be no restriction on whether there are phis or not.

Reviewers: reames, igor-laevsky

Reviewed By: igor-laevsky

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9803

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chen Li 2015-05-18 19:02:25 +00:00
parent 7b81f734ee
commit 2306579644
2 changed files with 40 additions and 2 deletions
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4
lib/Transforms/Scalar/PlaceSafepoints.cpp
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@ -716,8 +716,8 @@ bool PlaceSafepoints::runOnFunction(Function &F) {
CallSite &CS = ParsePointNeeded[i];
Value *GCResult = Results[i];
if (GCResult) {
// Can not RAUW for the gc result in case of phi nodes preset.
assert(!isa<PHINode>(cast<Instruction>(GCResult)->getParent()->begin()));
// Can not RAUW for the invoke gc result in case of phi nodes preset.
assert(CS.isCall() || !isa<PHINode>(cast<Instruction>(GCResult)->getParent()->begin()));
// Replace all uses with the new call
CS.getInstruction()->replaceAllUsesWith(GCResult);

38
test/Transforms/PlaceSafepoints/call_gc_result.ll Normal file
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@ -0,0 +1,38 @@
;; RUN: opt %s -place-safepoints -S | FileCheck %s
;; This test is to verify that gc_result from a call statepoint
;; can have preceding phis in its parent basic block. Unlike
;; invoke statepoint, call statepoint does not terminate the
;; block, and thus its gc_result is in the same block with the
;; call statepoint.
declare i32 @foo()
define i32 @test1(i1 %cond, i32 %a) gc "statepoint-example" {
entry:
br i1 %cond, label %branch1, label %branch2
branch1:
%b = add i32 %a, 1
br label %merge
branch2:
br label %merge
merge:
;; CHECK: %phi = phi i32 [ %a, %branch2 ], [ %b, %branch1 ]
;; CHECK-NEXT: %safepoint_token.1 = call i32 (i64, i32, i32 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i32f(i64 2882400000, i32 0, i32 ()* @foo, i32 0, i32 0, i32 0, i32 0)
;; CHECK-NEXT: %ret.2 = call i32 @llvm.experimental.gc.result.i32(i32 %safepoint_token.1)
%phi = phi i32 [ %a, %branch2 ], [ %b, %branch1 ]
%ret = call i32 @foo()
ret i32 %ret
}
; This function is inlined when inserting a poll.
declare void @do_safepoint()
define void @gc.safepoint_poll() {
; CHECK-LABEL: gc.safepoint_poll
entry:
call void @do_safepoint()
ret void
}