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Move Intrinsic::objectsize lowering back to InstCombineCalls and

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enable constant 0 offset lowering.

llvm-svn: 95691
This commit is contained in:
Eric Christopher 2010-02-09 21:24:27 +00:00
parent a651ca3caa
commit 6691a59247
2 changed files with 22 additions and 4 deletions
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20
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -230,7 +230,6 @@ Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) {
return 0;
}
/// visitCallInst - CallInst simplification. This mostly only handles folding
/// of intrinsic instructions. For normal calls, it allows visitCallSite to do
/// the heavy lifting.
@ -304,6 +303,25 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::objectsize: {
const Type *ReturnTy = CI.getType();
Value *Op1 = II->getOperand(1);
bool Min = (cast<ConstantInt>(II->getOperand(2))->getZExtValue() == 1);
if (!TD) break;
Op1 = Op1->stripPointerCasts();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op1)) {
if (GV->hasDefinitiveInitializer()) {
Constant *C = GV->getInitializer();
size_t globalSize = TD->getTypeAllocSize(C->getType());
return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, globalSize));
} else {
Constant *RetVal = ConstantInt::get(ReturnTy, Min ? 0 : -1ULL);
return ReplaceInstUsesWith(CI, RetVal);
}
}
}
case Intrinsic::bswap:
// bswap(bswap(x)) -> x
if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getOperand(1)))

6
test/Transforms/InstCombine/objsize.ll
View File

@ -1,6 +1,5 @@
; Test a pile of objectsize bounds checking.
; RUN: opt < %s -instcombine -S | FileCheck %s
; 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"
@ -32,9 +31,10 @@ cond.false:
ret i8* %2;
}
; FIXME: Should be ret i32 0
define i32 @f() nounwind {
; CHECK: @f
; CHECK-NEXT: ret i32 0
; CHECK-NEXT: llvm.objectsize.i32
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr ([60 x i8]* @a, i32 1, i32 0), i1 false)
ret i32 %1
}
@ -43,7 +43,7 @@ define i32 @f() nounwind {
define i1 @baz() nounwind {
; CHECK: @baz
; CHECK-NEXT: llvm.objectsize.i32
; CHECK-NEXT: ret i1 true
%1 = tail call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 0), i1 false)
%2 = icmp eq i32 %1, -1
ret i1 %2