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Do not split edges to EH landing pads. It will cause code size explosion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-03-05 06:31:26 +00:00
parent 0076c616e8
commit 6fb8f421ee
2 changed files with 40 additions and 0 deletions
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6
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -327,6 +327,12 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum,
assert(isa<PHINode>(Dest->begin()) &&
"This should only be called if Dest has a PHI!");
// Do not split edges to EH landing pads.
if (InvokeInst *Invoke = dyn_cast<InvokeInst>(TI)) {
if (Invoke->getSuccessor(1) == Dest)
return;
}
// As a hack, never split backedges of loops. Even though the copy for any
// PHIs inserted on the backedge would be dead for exits from the loop, we
// assume that the cost of *splitting* the backedge would be too high.

34
test/CodeGen/X86/split-eh-lpad-edges.ll Normal file
View File

@ -0,0 +1,34 @@
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin | not grep jmp
; rdar://6647639
%struct.FetchPlanHeader = type { i8*, i8*, i32, i8*, i8*, i8*, i8*, i8*, %struct.NSObject* (%struct.NSObject*, %struct.objc_selector*, ...)*, %struct.__attributeDescriptionFlags }
%struct.NSArray = type { %struct.NSObject }
%struct.NSAutoreleasePool = type { %struct.NSObject, i8*, i8*, i8*, i8* }
%struct.NSObject = type { %struct.NSObject* }
%struct.__attributeDescriptionFlags = type <{ i32 }>
%struct._message_ref_t = type { %struct.NSObject* (%struct.NSObject*, %struct._message_ref_t*, ...)*, %struct.objc_selector* }
%struct.objc_selector = type opaque
@"\01l_objc_msgSend_fixup_alloc" = external global %struct._message_ref_t, align 16 ; <%struct._message_ref_t*> [#uses=2]
define %struct.NSArray* @newFetchedRowsForFetchPlan_MT(%struct.FetchPlanHeader* %fetchPlan, %struct.objc_selector* %selectionMethod, %struct.NSObject* %selectionParameter) ssp {
entry:
%0 = invoke %struct.NSObject* null(%struct.NSObject* null, %struct._message_ref_t* @"\01l_objc_msgSend_fixup_alloc")
to label %invcont unwind label %lpad ; <%struct.NSObject*> [#uses=1]
invcont: ; preds = %entry
%1 = invoke %struct.NSObject* (%struct.NSObject*, %struct.objc_selector*, ...)* @objc_msgSend(%struct.NSObject* %0, %struct.objc_selector* null)
to label %invcont26 unwind label %lpad ; <%struct.NSObject*> [#uses=0]
invcont26: ; preds = %invcont
%2 = invoke %struct.NSObject* null(%struct.NSObject* null, %struct._message_ref_t* @"\01l_objc_msgSend_fixup_alloc")
to label %invcont27 unwind label %lpad ; <%struct.NSObject*> [#uses=0]
invcont27: ; preds = %invcont26
unreachable
lpad: ; preds = %invcont26, %invcont, %entry
%pool.1 = phi %struct.NSAutoreleasePool* [ null, %entry ], [ null, %invcont ], [ null, %invcont26 ] ; <%struct.NSAutoreleasePool*> [#uses=0]
unreachable
}
declare %struct.NSObject* @objc_msgSend(%struct.NSObject*, %struct.objc_selector*, ...)