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change the objectsize intrinsic signature: add a 3rd parameter to denote the maximum runtime performance penalty that the user is willing to accept.
This commit only adds the parameter. Code taking advantage of it will follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156473 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -8441,8 +8441,8 @@ LLVM</a>.</p>
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<h5>Syntax:</h5>
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<pre>
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declare i32 @llvm.objectsize.i32(i8* <object>, i1 <type>)
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declare i64 @llvm.objectsize.i64(i8* <object>, i1 <type>)
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declare i32 @llvm.objectsize.i32(i8* <object>, i1 <min>, i32 <runtime>)
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declare i64 @llvm.objectsize.i64(i8* <object>, i1 <min>, i32 <runtime>)
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</pre>
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<h5>Overview:</h5>
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@ -8453,17 +8453,21 @@ LLVM</a>.</p>
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an allocation of a specific class, structure, array, or other object.</p>
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<h5>Arguments:</h5>
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<p>The <tt>llvm.objectsize</tt> intrinsic takes two arguments. The first
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<p>The <tt>llvm.objectsize</tt> intrinsic takes three arguments. The first
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argument is a pointer to or into the <tt>object</tt>. The second argument
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is a boolean 0 or 1. This argument determines whether you want the
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maximum (0) or minimum (1) bytes remaining. This needs to be a literal 0 or
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1, variables are not allowed.</p>
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is a boolean and determines whether <tt>llvm.objectsize</tt> returns 0 (if true)
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or -1 (if false) when the object size is unknown.
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The third argument, <tt>runtime</tt>, indicates whether the compiler is allowed
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to return a non-constant value. The higher the value, the higher the potential
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run-time performance impact.
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The second and third arguments only accepts constants.</p>
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<h5>Semantics:</h5>
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<p>The <tt>llvm.objectsize</tt> intrinsic is lowered to either a constant
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representing the size of the object concerned, or <tt>i32/i64 -1 or 0</tt>,
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depending on the <tt>type</tt> argument, if the size cannot be determined at
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compile time.</p>
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<p>The <tt>llvm.objectsize</tt> intrinsic is lowered to a constant representing
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the size of the object concerned. If the size cannot be determined at compile
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time, <tt>llvm.objectsize</tt> either returns <tt>i32/i64 -1 or 0</tt>
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(depending on the <tt>min</tt> argument) if <tt>runtime</tt> is 0, or a run-time
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value (if <tt>runtime</tt> > 0 and an expression could be generated).</p>
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</div>
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<!-- _______________________________________________________________________ -->
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@ -268,7 +268,8 @@ def int_sigsetjmp : Intrinsic<[llvm_i32_ty] , [llvm_ptr_ty, llvm_i32_ty]>;
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def int_siglongjmp : Intrinsic<[], [llvm_ptr_ty, llvm_i32_ty]>;
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// Internal interface for object size checking
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def int_objectsize : Intrinsic<[llvm_anyint_ty], [llvm_ptr_ty, llvm_i1_ty],
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def int_objectsize : Intrinsic<[llvm_anyint_ty],
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[llvm_ptr_ty, llvm_i1_ty, llvm_i32_ty],
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[IntrNoMem]>,
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GCCBuiltin<"__builtin_object_size">;
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@ -52,6 +52,20 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
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}
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break;
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}
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case 'o': {
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// FIXME: remove in LLVM 3.3
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if (Name.startswith("objectsize.") && F->arg_size() == 2) {
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Type *Tys[] = {F->getReturnType(),
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F->arg_begin()->getType(),
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Type::getInt1Ty(F->getContext()),
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Type::getInt32Ty(F->getContext())};
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NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::objectsize,
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Tys);
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NewFn->takeName(F);
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return true;
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}
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break;
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}
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case 'x': {
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if (Name.startswith("x86.sse2.pcmpeq.") ||
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Name.startswith("x86.sse2.pcmpgt.") ||
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@ -195,7 +209,7 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
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llvm_unreachable("Unknown function for CallInst upgrade.");
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case Intrinsic::ctlz:
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case Intrinsic::cttz:
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case Intrinsic::cttz: {
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assert(CI->getNumArgOperands() == 1 &&
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"Mismatch between function args and call args");
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StringRef Name = CI->getName();
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@ -205,6 +219,16 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
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CI->eraseFromParent();
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return;
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}
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case Intrinsic::objectsize: {
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StringRef Name = CI->getName();
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CI->setName(Name + ".old");
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CI->replaceAllUsesWith(Builder.CreateCall3(NewFn, CI->getArgOperand(0),
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CI->getArgOperand(1),
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Builder.getInt32(0), Name));
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CI->eraseFromParent();
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return;
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}
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}
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}
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// This tests each Function to determine if it needs upgrading. When we find
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@ -43,7 +43,7 @@ bb:
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%3 = load i32* @tabsize, align 4
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%4 = srem i32 %cols, %3
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%5 = sdiv i32 %cols, %3
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%6 = tail call i32 @llvm.objectsize.i32(i8* null, i1 false)
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%6 = tail call i32 @llvm.objectsize.i32(i8* null, i1 false, i32 0)
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%7 = tail call i8* @__memset_chk(i8* null, i32 9, i32 %5, i32 %6) nounwind
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br label %bb1
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@ -54,5 +54,5 @@ bb1:
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ret void
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}
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declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readnone
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declare i32 @llvm.objectsize.i32(i8*, i1, i32) nounwind readnone
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declare i8* @__memset_chk(i8*, i32, i32, i32) nounwind
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@ -23,7 +23,7 @@ bb32: ; preds = %bb6
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%3 = load double* %1, align 4
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%4 = load double* %0, align 4
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call void @Parse_Vector(double* %0) nounwind
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%5 = call i32 @llvm.objectsize.i32(i8* undef, i1 false)
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%5 = call i32 @llvm.objectsize.i32(i8* undef, i1 false, i32 0)
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%6 = icmp eq i32 %5, -1
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br i1 %6, label %bb34, label %bb33
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@ -36,7 +36,7 @@ unreachable
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}
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declare void @Parse_Vector(double*)
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declare i32 @llvm.objectsize.i32(i8*, i1)
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declare i32 @llvm.objectsize.i32(i8*, i1, i32)
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; PR9578
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test/CodeGen/Generic/objectsize-upgrade.ll
Normal file
16
test/CodeGen/Generic/objectsize-upgrade.ll
Normal file
@ -0,0 +1,16 @@
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; RUN: opt < %s -verify -S | FileCheck %s
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; check automatic upgrade of objectsize. To be removed in LLVM 3.3.
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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"
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define i32 @foo() nounwind {
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; CHECK: @foo
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%1 = alloca i8, align 4
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%2 = getelementptr inbounds i8* %1, i32 0
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; CHECK: llvm.objectsize.i32(i8* %2, i1 false, i32 0)
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%3 = call i32 @llvm.objectsize.i32(i8* %2, i1 0)
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ret i32 %3
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}
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; CHECK: @llvm.objectsize.i32(i8*, i1, i32)
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declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
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@ -8,7 +8,7 @@ target triple = "x86_64-apple-macosx10.6.0"
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@aux_temp = external global %struct.dfa, align 8
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declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readnone
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declare i64 @llvm.objectsize.i64(i8*, i1, i32) nounwind readnone
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declare void @__memset_chk() nounwind
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@ -21,12 +21,12 @@ if.end.i: ; preds = %entry
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br i1 undef, label %land.end.thread.i, label %land.end.i
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land.end.thread.i: ; preds = %if.end.i
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%0 = call i64 @llvm.objectsize.i64(i8* undef, i1 false) nounwind
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%0 = call i64 @llvm.objectsize.i64(i8* undef, i1 false, i32 0) nounwind
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%cmp1710.i = icmp eq i64 %0, -1
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br i1 %cmp1710.i, label %cond.false156.i, label %cond.true138.i
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land.end.i: ; preds = %if.end.i
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%1 = call i64 @llvm.objectsize.i64(i8* undef, i1 false) nounwind
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%1 = call i64 @llvm.objectsize.i64(i8* undef, i1 false, i32 0) nounwind
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%cmp17.i = icmp eq i64 %1, -1
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br i1 %cmp17.i, label %cond.false156.i, label %cond.true138.i
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@ -203,7 +203,7 @@ entry:
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; <rdar://problem/9187792>
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define fastcc void @func_61() nounwind sspreq {
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entry:
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%t1 = tail call i64 @llvm.objectsize.i64(i8* undef, i1 false)
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%t1 = tail call i64 @llvm.objectsize.i64(i8* undef, i1 false, i32 0)
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%t2 = icmp eq i64 %t1, -1
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br i1 %t2, label %bb2, label %bb1
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@ -214,7 +214,7 @@ bb2:
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ret void
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}
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declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readnone
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declare i64 @llvm.objectsize.i64(i8*, i1, i32) nounwind readnone
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; PR10277
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; This test has dead code elimination caused by remat during spilling.
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@ -10,7 +10,7 @@ target triple = "x86_64-apple-darwin10.0"
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define void @bar() nounwind ssp {
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entry:
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%tmp = load i8** @p ; <i8*> [#uses=1]
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp, i1 0) ; <i64> [#uses=1]
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp, i1 0, i32 0) ; <i64> [#uses=1]
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%cmp = icmp ne i64 %0, -1 ; <i1> [#uses=1]
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; X64: movabsq $-1, [[RAX:%r..]]
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; X64: cmpq $-1, [[RAX]]
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@ -19,7 +19,7 @@ entry:
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cond.true: ; preds = %entry
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%tmp1 = load i8** @p ; <i8*> [#uses=1]
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%tmp2 = load i8** @p ; <i8*> [#uses=1]
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%1 = call i64 @llvm.objectsize.i64(i8* %tmp2, i1 1) ; <i64> [#uses=1]
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%1 = call i64 @llvm.objectsize.i64(i8* %tmp2, i1 1, i32 0) ; <i64> [#uses=1]
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%call = call i8* @__strcpy_chk(i8* %tmp1, i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i64 %1) ssp ; <i8*> [#uses=1]
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br label %cond.end
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@ -33,7 +33,7 @@ cond.end: ; preds = %cond.false, %cond.t
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ret void
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}
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declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readonly
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declare i64 @llvm.objectsize.i64(i8*, i1, i32) nounwind readonly
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declare i8* @__strcpy_chk(i8*, i8*, i64) ssp
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@ -47,7 +47,7 @@ entry:
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%tmp = load i8** %__dest.addr ; <i8*> [#uses=1]
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%tmp1 = load i8** %__src.addr ; <i8*> [#uses=1]
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%tmp2 = load i8** %__dest.addr ; <i8*> [#uses=1]
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp2, i1 1) ; <i64> [#uses=1]
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp2, i1 1, i32 0) ; <i64> [#uses=1]
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%call = call i8* @__strcpy_chk(i8* %tmp, i8* %tmp1, i64 %0) ssp ; <i8*> [#uses=1]
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store i8* %call, i8** %retval
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%1 = load i8** %retval ; <i8*> [#uses=1]
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@ -2,13 +2,13 @@
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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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target triple = "x86_64-apple-darwin10.0.0"
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declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readnone
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declare i64 @llvm.objectsize.i64(i8*, i1, i32) nounwind readnone
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define void @test5() nounwind optsize noinline ssp {
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entry:
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; CHECK: movq ___stack_chk_guard@GOTPCREL(%rip)
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%buf = alloca [64 x i8], align 16
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%0 = call i64 @llvm.objectsize.i64(i8* undef, i1 false)
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%0 = call i64 @llvm.objectsize.i64(i8* undef, i1 false, i32 0)
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br i1 false, label %if.end, label %if.then
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if.then: ; preds = %entry
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@ -2,7 +2,7 @@
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declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
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declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readnone
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declare i64 @llvm.objectsize.i64(i8*, i1, i32) nounwind readnone
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declare i8* @foo(i8*, i32, i64, i64) nounwind
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@ -23,7 +23,7 @@ entry:
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%tmp1 = load i32* %__val.addr, align 4, !dbg !21, !tbaa !17
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%tmp2 = load i64* %__len.addr, align 8, !dbg !21, !tbaa !19
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%tmp3 = load i8** %__dest.addr, align 8, !dbg !21, !tbaa !13
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp3, i1 false), !dbg !21
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%0 = call i64 @llvm.objectsize.i64(i8* %tmp3, i1 false, i32 0), !dbg !21
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%call = call i8* @foo(i8* %tmp, i32 %tmp1, i64 %tmp2, i64 %0), !dbg !21
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ret i8* %call, !dbg !21
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}
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@ -9,7 +9,7 @@ target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f3
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define i32 @foo() nounwind {
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; CHECK: @foo
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; CHECK-NEXT: ret i32 60
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false)
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false, i32 0)
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ret i32 %1
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}
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@ -17,7 +17,7 @@ define i8* @bar() nounwind {
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; CHECK: @bar
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entry:
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%retval = alloca i8*
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%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false)
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%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false, i32 0)
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%cmp = icmp ne i32 %0, -1
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; CHECK: br i1 true
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br i1 %cmp, label %cond.true, label %cond.false
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@ -34,7 +34,7 @@ cond.false:
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define i32 @f() nounwind {
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; CHECK: @f
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; CHECK-NEXT: ret i32 0
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr ([60 x i8]* @a, i32 1, i32 0), i1 false)
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr ([60 x i8]* @a, i32 1, i32 0), i1 false, i32 0)
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ret i32 %1
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}
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@ -43,7 +43,7 @@ define i32 @f() nounwind {
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define i1 @baz() nounwind {
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; CHECK: @baz
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; CHECK-NEXT: ret i1 true
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%1 = tail call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 0), i1 false)
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%1 = tail call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 0), i1 false, i32 0)
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%2 = icmp eq i32 %1, -1
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ret i1 %2
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}
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@ -52,7 +52,7 @@ define void @test1(i8* %q, i32 %x) nounwind noinline {
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; CHECK: @test1
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; CHECK: objectsize.i32
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entry:
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%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 10), i1 false) ; <i64> [#uses=1]
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%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 10), i1 false, i32 0) ; <i64> [#uses=1]
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%1 = icmp eq i32 %0, -1 ; <i1> [#uses=1]
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br i1 %1, label %"47", label %"46"
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@ -68,7 +68,7 @@ entry:
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define i32 @test2() nounwind {
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; CHECK: @test2
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; CHECK-NEXT: ret i32 34
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr (i8* bitcast ([9 x i32]* @.str5 to i8*), i32 2), i1 false)
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%1 = call i32 @llvm.objectsize.i32(i8* getelementptr (i8* bitcast ([9 x i32]* @.str5 to i8*), i32 2), i1 false, i32 0)
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ret i32 %1
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}
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@ -77,7 +77,7 @@ define i32 @test2() nounwind {
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declare i8* @__memcpy_chk(i8*, i8*, i32, i32) nounwind
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declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
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declare i32 @llvm.objectsize.i32(i8*, i1, i32) nounwind readonly
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declare i8* @__inline_memcpy_chk(i8*, i8*, i32) nounwind inlinehint
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@ -89,7 +89,7 @@ entry:
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bb11:
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%0 = getelementptr inbounds float* getelementptr inbounds ([480 x float]* @array, i32 0, i32 128), i32 -127 ; <float*> [#uses=1]
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%1 = bitcast float* %0 to i8* ; <i8*> [#uses=1]
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%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false) ; <i32> [#uses=1]
|
||||
%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false, i32 0) ; <i32> [#uses=1]
|
||||
%3 = call i8* @__memcpy_chk(i8* undef, i8* undef, i32 512, i32 %2) nounwind ; <i8*> [#uses=0]
|
||||
; CHECK: unreachable
|
||||
unreachable
|
||||
@ -111,7 +111,7 @@ define i32 @test4() nounwind ssp {
|
||||
entry:
|
||||
%0 = alloca %struct.data, align 8
|
||||
%1 = bitcast %struct.data* %0 to i8*
|
||||
%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false) nounwind
|
||||
%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false, i32 0) nounwind
|
||||
; CHECK-NOT: @llvm.objectsize
|
||||
; CHECK: @llvm.memset.p0i8.i32(i8* %1, i8 0, i32 1824, i32 8, i1 false)
|
||||
%3 = call i8* @__memset_chk(i8* %1, i32 0, i32 1824, i32 %2) nounwind
|
||||
@ -125,7 +125,7 @@ define void @test5(i32 %n) nounwind ssp {
|
||||
; CHECK: @test5
|
||||
entry:
|
||||
%0 = tail call noalias i8* @malloc(i32 20) nounwind
|
||||
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false)
|
||||
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false, i32 0)
|
||||
%2 = load i8** @s, align 8
|
||||
; CHECK-NOT: @llvm.objectsize
|
||||
; CHECK: @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* %1, i32 10, i32 1, i1 false)
|
||||
@ -137,7 +137,7 @@ define void @test6(i32 %n) nounwind ssp {
|
||||
; CHECK: @test6
|
||||
entry:
|
||||
%0 = tail call noalias i8* @malloc(i32 20) nounwind
|
||||
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false)
|
||||
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false, i32 0)
|
||||
%2 = load i8** @s, align 8
|
||||
; CHECK-NOT: @llvm.objectsize
|
||||
; CHECK: @__memcpy_chk(i8* %0, i8* %1, i32 30, i32 20)
|
||||
@ -153,7 +153,7 @@ define i32 @test7() {
|
||||
; CHECK: @test7
|
||||
%alloc = call noalias i8* @malloc(i32 48) nounwind
|
||||
%gep = getelementptr inbounds i8* %alloc, i32 16
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false) nounwind readonly
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false, i32 0) nounwind readonly
|
||||
; CHECK-NEXT: ret i32 32
|
||||
ret i32 %objsize
|
||||
}
|
||||
@ -164,7 +164,7 @@ define i32 @test8() {
|
||||
; CHECK: @test8
|
||||
%alloc = call noalias i8* @calloc(i32 5, i32 7) nounwind
|
||||
%gep = getelementptr inbounds i8* %alloc, i32 5
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false) nounwind readonly
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false, i32 0) nounwind readonly
|
||||
; CHECK-NEXT: ret i32 30
|
||||
ret i32 %objsize
|
||||
}
|
||||
@ -174,7 +174,7 @@ define i32 @test9() {
|
||||
; CHECK: @test9
|
||||
%alloc = call noalias i8* @calloc(i32 100000000, i32 100000000) nounwind
|
||||
%gep = getelementptr inbounds i8* %alloc, i32 2
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 true) nounwind readonly
|
||||
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 true, i32 0) nounwind readonly
|
||||
; CHECK-NEXT: ret i32 0
|
||||
ret i32 %objsize
|
||||
}
|
||||
|
@ -11,7 +11,7 @@ declare i8* @strcpy(i8*, i8*)
|
||||
|
||||
declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
|
||||
|
||||
declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
|
||||
declare i32 @llvm.objectsize.i32(i8*, i1, i32) nounwind readonly
|
||||
|
||||
; rdar://6839935
|
||||
|
||||
@ -30,7 +30,7 @@ define i32 @t2() {
|
||||
%target = alloca [1024 x i8]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
%tmp1 = call i32 @llvm.objectsize.i32(i8* %arg1, i1 false)
|
||||
%tmp1 = call i32 @llvm.objectsize.i32(i8* %arg1, i1 false, i32 0)
|
||||
%rslt1 = call i8* @__strcpy_chk(i8* %arg1, i8* %arg2, i32 %tmp1)
|
||||
; CHECK: @__memcpy_chk
|
||||
ret i32 0
|
||||
|
Loading…
Reference in New Issue
Block a user