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Provide an ICmpInst::makeConstantRange to generate a ConstantRange value

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from a predicate and an APInt. This is removed from ConstantRange class
so that ConstantRange doesn't have to depend on lib/VMCore.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2007-02-28 22:00:54 +00:00
parent 8782d481a3
commit 3da43849f2
2 changed files with 42 additions and 0 deletions
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36
lib/VMCore/Instructions.cpp
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@@ -18,6 +18,7 @@
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/ConstantRange.h"
using namespace llvm;
unsigned CallSite::getCallingConv() const {
@@ -2217,6 +2218,41 @@ bool ICmpInst::isSignedPredicate(Predicate pred) {
}
}
/// Initialize a set of values that all satisfy the condition with C.
///
ConstantRange
ICmpInst::makeConstantRange(Predicate pred, const APInt &C) {
APInt Lower(C);
APInt Upper(C);
uint32_t BitWidth = C.getBitWidth();
switch (pred) {
default: assert(0 && "Invalid ICmp opcode to ConstantRange ctor!");
case ICmpInst::ICMP_EQ: Upper++; break;
case ICmpInst::ICMP_NE: Lower++; break;
case ICmpInst::ICMP_ULT: Lower = APInt::getMinValue(BitWidth); break;
case ICmpInst::ICMP_SLT: Lower = APInt::getSignedMinValue(BitWidth); break;
case ICmpInst::ICMP_UGT:
Lower++; Upper = APInt::getMinValue(BitWidth); // Min = Next(Max)
break;
case ICmpInst::ICMP_SGT:
Lower++; Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max)
break;
case ICmpInst::ICMP_ULE:
Lower = APInt::getMinValue(BitWidth); Upper++;
break;
case ICmpInst::ICMP_SLE:
Lower = APInt::getSignedMinValue(BitWidth); Upper++;
break;
case ICmpInst::ICMP_UGE:
Upper = APInt::getMinValue(BitWidth); // Min = Next(Max)
break;
case ICmpInst::ICMP_SGE:
Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max)
break;
}
return ConstantRange(Lower, Upper);
}
FCmpInst::Predicate FCmpInst::getInversePredicate(Predicate pred) {
switch (pred) {
default: