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add -bounds-checking-multiple-traps option to make one trap BB per check
disabled by default for now; we can discusse the default value (& name) later llvm-svn: 157777
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@ -20,6 +20,7 @@
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionExpander.h"
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#include "llvm/Analysis/ScalarEvolutionExpressions.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/IRBuilder.h"
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@ -35,6 +36,9 @@
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#include "llvm/Pass.h"
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using namespace llvm;
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static cl::opt<bool> ManyTrapBB("bounds-checking-multiple-traps",
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cl::desc("Use one trap block per assertion"));
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STATISTIC(ChecksAdded, "Bounds checks added");
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STATISTIC(ChecksSkipped, "Bounds checks skipped");
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STATISTIC(ChecksUnable, "Bounds checks unable to add");
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@ -98,7 +102,7 @@ INITIALIZE_PASS_END(BoundsChecking, "bounds-checking",
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/// getTrapBB - create a basic block that traps. All overflowing conditions
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/// branch to this block. There's only one trap block per function.
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BasicBlock *BoundsChecking::getTrapBB() {
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if (TrapBB)
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if (TrapBB && !ManyTrapBB)
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return TrapBB;
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BasicBlock::iterator PrevInsertPoint = Builder->GetInsertPoint();
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12
test/Transforms/BoundsChecking/many-trap.ll
Normal file
12
test/Transforms/BoundsChecking/many-trap.ll
Normal file
@ -0,0 +1,12 @@
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; RUN: opt < %s -bounds-checking -bounds-checking-multiple-traps -S | FileCheck %s
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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-S128"
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; CHECK: @f1
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define void @f1(i64 %x) nounwind {
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%1 = alloca i128, i64 %x
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%2 = load i128* %1, align 4
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%3 = load i128* %1, align 4
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ret void
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; CHECK: llvm.trap
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; CHECK: llvm.trap
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}
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