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Fix SCCP's handling of struct value loads and stores. SCCP doesn't

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track individual leaf values in such cases, so it needs to treat
struct values as normal values in this case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-08-13 21:22:48 +00:00
parent 38db6ccb47
commit 2edeb63ece
2 changed files with 20 additions and 2 deletions
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2
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1583,7 +1583,6 @@ bool SCCP::runOnFunction(Function &F) {
for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) { for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) {
Instruction *Inst = BI++; Instruction *Inst = BI++;
if (Inst->getType() == Type::VoidTy || if (Inst->getType() == Type::VoidTy ||
isa<StructType>(Inst->getType()) ||
isa<TerminatorInst>(Inst)) isa<TerminatorInst>(Inst))
continue; continue;
@ -1760,7 +1759,6 @@ bool IPSCCP::runOnModule(Module &M) {
for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) { for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) {
Instruction *Inst = BI++; Instruction *Inst = BI++;
if (Inst->getType() == Type::VoidTy || if (Inst->getType() == Type::VoidTy ||
isa<StructType>(Inst->getType()) ||
isa<TerminatorInst>(Inst)) isa<TerminatorInst>(Inst))
continue; continue;

20
test/Transforms/SCCP/empty-struct.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llvm-as < %s > %t.bc
; RUN: llvm-ld %t.bc -o %t.sh
; PR2612
@current_foo = internal global { } zeroinitializer
define i32 @main(...) {
entry:
%retval = alloca i32 ; <i32*> [#uses=2]
store i32 0, i32* %retval
%local_foo = alloca { } ; <{ }*> [#uses=1]
load { }* @current_foo ; <{ }>:0 [#uses=1]
store { } %0, { }* %local_foo
br label %return
return: ; preds = %entry
load i32* %retval ; <i32>:1 [#uses=1]
ret i32 %1
}