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Ding dong, the DoesntAccessMemoryFns and

Browse Source 
OnlyReadsMemoryFns tables are dead!  We
get more, and more accurate, information
from gcc via the readnone and readonly
function attributes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-11-23 19:30:27 +00:00
parent bb65098d2c
commit e4dc717585
8 changed files with 83 additions and 193 deletions
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113
lib/Analysis/BasicAliasAnalysis.cpp
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@@ -810,85 +810,9 @@ BasicAliasAnalysis::CheckGEPInstructions(
return MayAlias;
}
namespace {
struct VISIBILITY_HIDDEN StringCompare {
bool operator()(const char *LHS, const char *RHS) {
return strcmp(LHS, RHS) < 0;
}
};
}
// Note that this list cannot contain libm functions (such as acos and sqrt)
// that set errno on a domain or other error.
static const char *DoesntAccessMemoryFns[] = {
"abs", "labs", "llabs", "imaxabs", "fabs", "fabsf", "fabsl",
"trunc", "truncf", "truncl", "ldexp",
"atan", "atanf", "atanl", "atan2", "atan2f", "atan2l",
"cbrt",
"cos", "cosf", "cosl",
"exp", "expf", "expl",
"hypot",
"sin", "sinf", "sinl",
"tan", "tanf", "tanl", "tanh", "tanhf", "tanhl",
"floor", "floorf", "floorl", "ceil", "ceilf", "ceill",
// ctype.h
"isalnum", "isalpha", "iscntrl", "isdigit", "isgraph", "islower", "isprint"
"ispunct", "isspace", "isupper", "isxdigit", "tolower", "toupper",
// wctype.h"
"iswalnum", "iswalpha", "iswcntrl", "iswdigit", "iswgraph", "iswlower",
"iswprint", "iswpunct", "iswspace", "iswupper", "iswxdigit",
"iswctype", "towctrans", "towlower", "towupper",
"btowc", "wctob",
"isinf", "isnan", "finite",
// C99 math functions
"copysign", "copysignf", "copysignd",
"nexttoward", "nexttowardf", "nexttowardd",
"nextafter", "nextafterf", "nextafterd",
// ISO C99:
"__signbit", "__signbitf", "__signbitl",
};
static const char *OnlyReadsMemoryFns[] = {
"atoi", "atol", "atof", "atoll", "atoq", "a64l",
"bcmp", "memcmp", "memchr", "memrchr", "wmemcmp", "wmemchr",
// Strings
"strcmp", "strcasecmp", "strcoll", "strncmp", "strncasecmp",
"strchr", "strcspn", "strlen", "strpbrk", "strrchr", "strspn", "strstr",
"index", "rindex",
// Wide char strings
"wcschr", "wcscmp", "wcscoll", "wcscspn", "wcslen", "wcsncmp", "wcspbrk",
"wcsrchr", "wcsspn", "wcsstr",
// glibc
"alphasort", "alphasort64", "versionsort", "versionsort64",
// C99
"nan", "nanf", "nand",
// File I/O
"feof", "ferror", "fileno",
"feof_unlocked", "ferror_unlocked", "fileno_unlocked"
};
static ManagedStatic<std::vector<const char*> > NoMemoryTable;
static ManagedStatic<std::vector<const char*> > OnlyReadsMemoryTable;
static ManagedStatic<BitVector> NoMemoryIntrinsics;
static ManagedStatic<BitVector> OnlyReadsMemoryIntrinsics;
AliasAnalysis::ModRefBehavior
BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
std::vector<PointerAccessInfo> *Info) {
@@ -896,19 +820,6 @@ BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
static bool Initialized = false;
if (!Initialized) {
NoMemoryTable->insert(NoMemoryTable->end(),
DoesntAccessMemoryFns,
array_endof(DoesntAccessMemoryFns));
OnlyReadsMemoryTable->insert(OnlyReadsMemoryTable->end(),
OnlyReadsMemoryFns,
array_endof(OnlyReadsMemoryFns));
// Sort the table the first time through.
std::sort(NoMemoryTable->begin(), NoMemoryTable->end(), StringCompare());
std::sort(OnlyReadsMemoryTable->begin(), OnlyReadsMemoryTable->end(),
StringCompare());
NoMemoryIntrinsics->resize(Intrinsic::num_intrinsics);
OnlyReadsMemoryIntrinsics->resize(Intrinsic::num_intrinsics);
#define GET_MODREF_BEHAVIOR
@@ -927,30 +838,6 @@ BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
return UnknownModRefBehavior;
}
ValueName *Name = F->getValueName();
if (!Name)
return UnknownModRefBehavior;
unsigned NameLen = Name->getKeyLength();
const char *NamePtr = Name->getKeyData();
// If there is an embedded nul character in the function name, we can never
// match it.
if (strlen(NamePtr) != NameLen)
return UnknownModRefBehavior;
std::vector<const char*>::iterator Ptr =
std::lower_bound(NoMemoryTable->begin(), NoMemoryTable->end(),
NamePtr, StringCompare());
if (Ptr != NoMemoryTable->end() && strcmp(*Ptr, NamePtr) == 0)
return DoesNotAccessMemory;
Ptr = std::lower_bound(OnlyReadsMemoryTable->begin(),
OnlyReadsMemoryTable->end(),
NamePtr, StringCompare());
if (Ptr != OnlyReadsMemoryTable->end() && strcmp(*Ptr, NamePtr) == 0)
return OnlyReadsMemory;
const ParamAttrsList *Attrs = F->getFunctionType()->getParamAttrs();
if (Attrs && Attrs->paramHasAttr(0, ParamAttr::ReadNone))