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Treat a call of function pointer like a load of the pointer when considering
whether the pointer can be replaced with the global variable it is a copy of. Fixes PR8680. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120126 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1783,7 +1783,7 @@ static bool PointsToConstantGlobal(Value *V) {
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/// see any stores or other unknown uses. If we see pointer arithmetic, keep
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/// track of whether it moves the pointer (with isOffset) but otherwise traverse
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/// the uses. If we see a memcpy/memmove that targets an unoffseted pointer to
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/// the alloca, and if the source pointer is a pointer to a constant global, we
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/// the alloca, and if the source pointer is a pointer to a constant global, we
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/// can optimize this.
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static bool isOnlyCopiedFromConstantGlobal(Value *V, MemTransferInst *&TheCopy,
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bool isOffset) {
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@ -1816,6 +1816,11 @@ static bool isOnlyCopiedFromConstantGlobal(Value *V, MemTransferInst *&TheCopy,
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// load and we can ignore it.
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if (CS.onlyReadsMemory())
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continue;
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// If this is the function being called then we treat it like a load and
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// ignore it.
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if (CS.isCallee(UI))
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continue;
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// If this is being passed as a byval argument, the caller is making a
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// copy, so it is only a read of the alloca.
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13
test/Transforms/ScalarRepl/2010-11-24-IndirectVoid.ll
Normal file
13
test/Transforms/ScalarRepl/2010-11-24-IndirectVoid.ll
Normal file
@ -0,0 +1,13 @@
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; RUN: opt -scalarrepl -disable-output %s
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; PR8680
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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define void @main() nounwind {
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entry:
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%memtmp = alloca i32, align 4
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%0 = bitcast i32* %memtmp to void ()*
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call void %0() nounwind
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ret void
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}
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