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Generalize getUnaryFloatFunction to handle any FP unary function, automatically

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figuring out the suffix to use.  implement pow(2,x) -> exp2(x).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49437 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-04-09 17:48:11 +00:00
parent 090a816623
commit cc7f168c6c
2 changed files with 38 additions and 17 deletions
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50
lib/Transforms/IPO/SimplifyLibCalls.cpp
View File

@ -328,18 +328,36 @@ public:
return memcpy_func;
}
Constant *getUnaryFloatFunction(const char *Name, Constant *&Cache) {
if (!Cache)
Cache = M->getOrInsertFunction(Name, Type::FloatTy, Type::FloatTy, NULL);
return Cache;
Constant *getUnaryFloatFunction(const char *BaseName, const Type *T = 0) {
if (T == 0) T = Type::FloatTy;
char NameBuffer[20];
const char *Name;
if (T == Type::DoubleTy)
Name = BaseName; // floor
else {
Name = NameBuffer;
unsigned NameLen = strlen(BaseName);
assert(NameLen < sizeof(NameBuffer)-2 && "Buffer too small");
memcpy(NameBuffer, BaseName, NameLen);
if (T == Type::FloatTy)
NameBuffer[NameLen] = 'f'; // floorf
else
NameBuffer[NameLen] = 'l'; // floorl
NameBuffer[NameLen+1] = 0;
}
return M->getOrInsertFunction(Name, T, T, NULL);
}
Constant *get_floorf() { return getUnaryFloatFunction("floorf", floorf_func);}
Constant *get_ceilf() { return getUnaryFloatFunction( "ceilf", ceilf_func);}
Constant *get_roundf() { return getUnaryFloatFunction("roundf", roundf_func);}
Constant *get_rintf() { return getUnaryFloatFunction( "rintf", rintf_func);}
Constant *get_nearbyintf() { return getUnaryFloatFunction("nearbyintf",
nearbyintf_func); }
Constant *get_floorf() { return getUnaryFloatFunction("floor"); }
Constant *get_ceilf() { return getUnaryFloatFunction( "ceil"); }
Constant *get_roundf() { return getUnaryFloatFunction("round"); }
Constant *get_rintf() { return getUnaryFloatFunction( "rint"); }
Constant *get_nearbyintf() { return getUnaryFloatFunction("nearbyint"); }
private:
/// @brief Reset our cached data for a new Module
void reset(Module& mod) {
@ -355,11 +373,6 @@ private:
sqrt_func = 0;
strcpy_func = 0;
strlen_func = 0;
floorf_func = 0;
ceilf_func = 0;
roundf_func = 0;
rintf_func = 0;
nearbyintf_func = 0;
}
private:
@ -369,8 +382,6 @@ private:
Constant *memcpy_func, *memchr_func;
Constant *sqrt_func;
Constant *strcpy_func, *strlen_func;
Constant *floorf_func, *ceilf_func, *roundf_func;
Constant *rintf_func, *nearbyintf_func;
Module *M; ///< Cached Module
TargetData *TD; ///< Cached TargetData
};
@ -1154,6 +1165,11 @@ public:
if (ConstantFP *Op1C = dyn_cast<ConstantFP>(Op1)) {
if (Op1C->isExactlyValue(1.0)) // pow(1.0, x) -> 1.0
return ReplaceCallWith(CI, Op1C);
if (Op1C->isExactlyValue(2.0)) {// pow(2.0, x) -> exp2(x)
Value *Exp2 = SLC.getUnaryFloatFunction("exp2", CI->getType());
Value *Res = CallInst::Create(Exp2, Op2, CI->getName()+"exp2", CI);
return ReplaceCallWith(CI, Res);
}
}
ConstantFP *Op2C = dyn_cast<ConstantFP>(Op2);

5
test/Transforms/SimplifyLibCalls/pow2.ll
View File

@ -30,3 +30,8 @@ define float @test4f(float %X) {
%Y = call float @powf( float %X, float 2.0)
ret float %Y
}
define float @test5f(float %X) {
%Y = call float @powf(float 2.0, float %X) ;; exp2
ret float %Y
}