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add -bounds-checking-multiple-traps option to make one trap BB per check

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disabled by default for now; we can discusse the default value (& name) later

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157777 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes 2012-05-31 22:58:48 +00:00
parent 0463cce55d
commit 1cbf2be592
2 changed files with 17 additions and 1 deletions
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6
lib/Transforms/Scalar/BoundsChecking.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/IRBuilder.h"
@ -35,6 +36,9 @@
#include "llvm/Pass.h"
using namespace llvm;
static cl::opt<bool> ManyTrapBB("bounds-checking-multiple-traps",
cl::desc("Use one trap block per assertion"));
STATISTIC(ChecksAdded, "Bounds checks added");
STATISTIC(ChecksSkipped, "Bounds checks skipped");
STATISTIC(ChecksUnable, "Bounds checks unable to add");
@ -98,7 +102,7 @@ INITIALIZE_PASS_END(BoundsChecking, "bounds-checking",
/// getTrapBB - create a basic block that traps. All overflowing conditions
/// branch to this block. There's only one trap block per function.
BasicBlock *BoundsChecking::getTrapBB() {
if (TrapBB)
if (TrapBB && !ManyTrapBB)
return TrapBB;
BasicBlock::iterator PrevInsertPoint = Builder->GetInsertPoint();

12
test/Transforms/BoundsChecking/many-trap.ll Normal file
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@ -0,0 +1,12 @@
; RUN: opt < %s -bounds-checking -bounds-checking-multiple-traps -S | FileCheck %s
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-S128"
; CHECK: @f1
define void @f1(i64 %x) nounwind {
%1 = alloca i128, i64 %x
%2 = load i128* %1, align 4
%3 = load i128* %1, align 4
ret void
; CHECK: llvm.trap
; CHECK: llvm.trap
}