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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66867 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2009-03-13 04:39:26 +00:00
parent c7a09ab311
commit 0582ae99ba
14 changed files with 233 additions and 254 deletions
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58
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@@ -551,10 +551,9 @@ struct VISIBILITY_HIDDEN StrChrOpt : public LibCallOptimization {
// Otherwise, the character is a constant, see if the first argument is
// a string literal. If so, we can constant fold.
const char *SI = GetConstantStringInfo(SrcStr);
if (!SI)
std::string Str;
if (!GetConstantStringInfo(SrcStr, Str))
return 0;
std::string Str = SI;
// strchr can find the nul character.
Str += '\0';
@@ -593,28 +592,27 @@ struct VISIBILITY_HIDDEN StrCmpOpt : public LibCallOptimization {
if (Str1P == Str2P) // strcmp(x,x) -> 0
return ConstantInt::get(CI->getType(), 0);
const char *Str1 = GetConstantStringInfo(Str1P);
const char *Str2 = GetConstantStringInfo(Str1P);
if (Str1) // strcmp("", x) -> *x
std::string Str1, Str2;
bool HasStr1 = GetConstantStringInfo(Str1P, Str1);
bool HasStr2 = GetConstantStringInfo(Str2P, Str2);
if (HasStr1 && Str1.empty()) // strcmp("", x) -> *x
return B.CreateZExt(B.CreateLoad(Str2P, "strcmpload"), CI->getType());
if (Str2) // strcmp(x,"") -> *x
if (HasStr2 && Str2.empty()) // strcmp(x,"") -> *x
return B.CreateZExt(B.CreateLoad(Str1P, "strcmpload"), CI->getType());
// strcmp(x, y) -> cnst (if both x and y are constant strings)
if (Str1 && Str2)
return ConstantInt::get(CI->getType(), strcmp(Str1, Str2));
if (HasStr1 && HasStr2)
return ConstantInt::get(CI->getType(), strcmp(Str1.c_str(),Str2.c_str()));
// strcmp(P, "x") -> memcmp(P, "x", 2)
uint64_t Len1 = GetStringLength(Str1P);
uint64_t Len2 = GetStringLength(Str2P);
if (Len1 || Len2) {
// Choose the smallest Len excluding 0 which means 'unknown'.
if (!Len1 || (Len2 && Len2 < Len1))
Len1 = Len2;
return EmitMemCmp(Str1P, Str2P,
ConstantInt::get(TD->getIntPtrType(), Len1), B);
}
@@ -649,21 +647,21 @@ struct VISIBILITY_HIDDEN StrNCmpOpt : public LibCallOptimization {
if (Length == 0) // strncmp(x,y,0) -> 0
return ConstantInt::get(CI->getType(), 0);
const char *Str1 = GetConstantStringInfo(Str1P);
const char *Str2 = GetConstantStringInfo(Str2P);
if (Str1) // strncmp("", x, n) -> *x
std::string Str1, Str2;
bool HasStr1 = GetConstantStringInfo(Str1P, Str1);
bool HasStr2 = GetConstantStringInfo(Str2P, Str2);
if (HasStr1 && Str1.empty()) // strncmp("", x, n) -> *x
return B.CreateZExt(B.CreateLoad(Str2P, "strcmpload"), CI->getType());
if (Str2) // strncmp(x, "", n) -> *x
if (HasStr2 && Str2.empty()) // strncmp(x, "", n) -> *x
return B.CreateZExt(B.CreateLoad(Str1P, "strcmpload"), CI->getType());
// strncmp(x, y) -> cnst (if both x and y are constant strings)
if (Str1 && Str2)
if (HasStr1 && HasStr2)
return ConstantInt::get(CI->getType(),
strncmp(Str1, Str2, Length));
strncmp(Str1.c_str(), Str2.c_str(), Length));
return 0;
}
};
@@ -1118,9 +1116,9 @@ struct VISIBILITY_HIDDEN PrintFOpt : public LibCallOptimization {
return 0;
// Check for a fixed format string.
const char *FormatCStr = GetConstantStringInfo(CI->getOperand(1));
if (!FormatCStr) return 0;
std::string FormatStr = FormatCStr;
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(1), FormatStr))
return 0;
// Empty format string -> noop.
if (FormatStr.empty()) // Tolerate printf's declared void.
@@ -1178,9 +1176,9 @@ struct VISIBILITY_HIDDEN SPrintFOpt : public LibCallOptimization {
return 0;
// Check for a fixed format string.
const char *FormatCStr = GetConstantStringInfo(CI->getOperand(2));
if (!FormatCStr) return 0;
std::string FormatStr = FormatCStr;
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
return 0;
// If we just have a format string (nothing else crazy) transform it.
if (CI->getNumOperands() == 3) {
@@ -1299,9 +1297,9 @@ struct VISIBILITY_HIDDEN FPrintFOpt : public LibCallOptimization {
return 0;
// All the optimizations depend on the format string.
const char *FormatCStr = GetConstantStringInfo(CI->getOperand(2));
if (!FormatCStr) return 0;
std::string FormatStr = FormatCStr;
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
return 0;
// fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
if (CI->getNumOperands() == 3) {