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Remove this code for now. I have a better idea and will rewrite with

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that in mind.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95402 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2010-02-05 19:04:06 +00:00
parent 8d280fb50a
commit 724bea90b0
2 changed files with 13 additions and 43 deletions
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41
lib/Transforms/InstCombine/InstCombineCalls.cpp
View File

@ -632,47 +632,6 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
return EraseInstFromFunction(CI);
break;
}
case Intrinsic::objectsize: {
const Type *ReturnTy = CI.getType();
Value *Op1 = II->getOperand(1);
// If we're a constant expr then we just return the number of bytes
// left in whatever we're indexing. Since it's constant there's no
// need for maximum or minimum bytes.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op1)) {
// If this isn't a GEP give up.
if (CE->getOpcode() != Instruction::GetElementPtr) return 0;
const PointerType *ObjTy =
reinterpret_cast<const PointerType*>(CE->getOperand(0)->getType());
if (const ArrayType *AT = dyn_cast<ArrayType>(ObjTy->getElementType())) {
// Deal with multi-dimensional arrays
const ArrayType *SAT = AT;
while ((AT = dyn_cast<ArrayType>(AT->getElementType())))
SAT = AT;
size_t numElems = SAT->getNumElements();
// If numElems is 0, we don't know how large the array is so we can't
// make any determinations yet.
if (numElems == 0) break;
// We return the remaining bytes, so grab the size of an element
// in bytes.
size_t sizeofElem = SAT->getElementType()->getPrimitiveSizeInBits() / 8;
ConstantInt *Const =
cast<ConstantInt>(CE->getOperand(CE->getNumOperands() - 1));
size_t indx = Const->getZExtValue();
return ReplaceInstUsesWith(CI,
ConstantInt::get(ReturnTy,
((numElems - indx) * sizeofElem)));
}
}
// TODO: Add more types here.
}
}
return visitCallSite(II);

15
test/Transforms/InstCombine/objsize.ll
View File

@ -1,5 +1,10 @@
; Test a pile of objectsize bounds checking.
; RUN: opt < %s -instcombine -S | FileCheck %s
@a = common global [60 x i8] zeroinitializer, align 1 ; <[60 x i8]*>
; XFAIL: *
; We need target data to get the sizes of the arrays and structures.
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"
@a = private global [60 x i8] zeroinitializer, align 1 ; <[60 x i8]*>
@.str = private constant [8 x i8] c"abcdefg\00" ; <[8 x i8]*>
define i32 @foo() nounwind {
@ -27,6 +32,13 @@ cond.false:
ret i8* %2;
}
define i32 @f() nounwind {
; CHECK: @f
; CHECK-NEXT: ret i32 0
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr ([60 x i8]* @a, i32 1, i32 0), i1 false)
ret i32 %1
}
@window = external global [0 x i8]
define i1 @baz() nounwind {
@ -37,5 +49,4 @@ define i1 @baz() nounwind {
ret i1 %2
}
declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly