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Fix PR2471, which is a bug involving an invalid promotion from a conditional load.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52525 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-06-20 05:12:56 +00:00
parent 28e6ff57d4
commit 2de3fec61c
2 changed files with 23 additions and 1 deletions
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8
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -10062,10 +10062,16 @@ static bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom) {
while (BBI != E) {
--BBI;
// If we see a free or a call (which might do a free) the pointer could be
// marked invalid.
if (isa<FreeInst>(BBI) || isa<CallInst>(BBI))
return false;
if (LoadInst *LI = dyn_cast<LoadInst>(BBI)) {
if (LI->getOperand(0) == V) return true;
} else if (StoreInst *SI = dyn_cast<StoreInst>(BBI))
} else if (StoreInst *SI = dyn_cast<StoreInst>(BBI)) {
if (SI->getOperand(1) == V) return true;
}
}
return false;

16
test/Transforms/InstCombine/2008-06-19-UncondLoad.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep load | count 3
; PR2471
declare i32 @x(i32*)
define i32 @b(i32* %a, i32* %b) {
entry:
%tmp1 = load i32* %a
%tmp3 = load i32* %b
%add = add i32 %tmp1, %tmp3
%call = call i32 @x( i32* %a )
%tobool = icmp ne i32 %add, 0
; not safe to turn into an uncond load
%cond = select i1 %tobool, i32* %b, i32* %a
%tmp8 = load i32* %cond
ret i32 %tmp8
}