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Disable the call-deletion transformation introduced in r86975. Without

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halting analysis, it is illegal to delete a call to a read-only function.
The correct solution is almost certainly to add a "must halt" attribute and
only allow deletions in its presence.

XFAIL the relevant testcase for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102831 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-05-01 08:34:28 +00:00
parent bccb41afc8
commit 1b4a38646f
2 changed files with 9 additions and 2 deletions
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9
lib/Transforms/IPO/Inliner.cpp
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@ -33,7 +33,8 @@
using namespace llvm;
STATISTIC(NumInlined, "Number of functions inlined");
STATISTIC(NumCallsDeleted, "Number of call sites deleted, not inlined");
// FIXME: Uncomment once call deletion xform is made safe
// STATISTIC(NumCallsDeleted, "Number of call sites deleted, not inlined");
STATISTIC(NumDeleted, "Number of functions deleted because all callers found");
STATISTIC(NumMergedAllocas, "Number of allocas merged together");
@ -382,6 +383,9 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
Function *Caller = CS.getCaller();
Function *Callee = CS.getCalledFunction();
// FIXME: This transformation is not legal unless we can prove
// that the callee always terminates.
#if 0
// If this call site is dead and it is to a readonly function, we should
// just delete the call instead of trying to inline it, regardless of
// size. This happens because IPSCCP propagates the result out of the
@ -396,6 +400,7 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
// Update the cached cost info with the missing call
growCachedCostInfo(Caller, NULL);
} else {
#endif
// We can only inline direct calls to non-declarations.
if (Callee == 0 || Callee->isDeclaration()) continue;
@ -437,7 +442,9 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
// Update the cached cost info with the inlined call.
growCachedCostInfo(Caller, Callee);
#if 0
}
#endif
// If we inlined or deleted the last possible call site to the function,
// delete the function body now.

2
test/Transforms/Inline/delete-call.ll
View File

@ -1,6 +1,6 @@
; RUN: opt %s -S -inline -functionattrs -stats |& grep {Number of call sites deleted, not inlined}
; RUN: opt %s -S -inline -stats |& grep {Number of functions inlined}
; XFAIL: *
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
target triple = "i386-apple-darwin9.8"