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Use pre-inc, pre-dec when possible.

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They are generally faster (at least not slower) than post-inc, post-dec.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177608 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakub Staszak 2013-03-20 23:56:19 +00:00
parent 7f19e5db5f
commit 2adf8ccbf0
3 changed files with 12 additions and 12 deletions
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4
include/llvm/ADT/APSInt.h
View File

@ -161,11 +161,11 @@ public:
} }
APSInt& operator++() { APSInt& operator++() {
static_cast<APInt&>(*this)++; ++(static_cast<APInt&>(*this));
return *this; return *this;
} }
APSInt& operator--() { APSInt& operator--() {
static_cast<APInt&>(*this)--; --(static_cast<APInt&>(*this));
return *this; return *this;
} }
APSInt operator++(int) { APSInt operator++(int) {

12
lib/IR/Instructions.cpp
View File

@ -3000,8 +3000,8 @@ ICmpInst::makeConstantRange(Predicate pred, const APInt &C) {
uint32_t BitWidth = C.getBitWidth(); uint32_t BitWidth = C.getBitWidth();
switch (pred) { switch (pred) {
default: llvm_unreachable("Invalid ICmp opcode to ConstantRange ctor!"); default: llvm_unreachable("Invalid ICmp opcode to ConstantRange ctor!");
case ICmpInst::ICMP_EQ: Upper++; break; case ICmpInst::ICMP_EQ: ++Upper; break;
case ICmpInst::ICMP_NE: Lower++; break; case ICmpInst::ICMP_NE: ++Lower; break;
case ICmpInst::ICMP_ULT: case ICmpInst::ICMP_ULT:
Lower = APInt::getMinValue(BitWidth); Lower = APInt::getMinValue(BitWidth);
// Check for an empty-set condition. // Check for an empty-set condition.
@ -3015,25 +3015,25 @@ ICmpInst::makeConstantRange(Predicate pred, const APInt &C) {
return ConstantRange(BitWidth, /*isFullSet=*/false); return ConstantRange(BitWidth, /*isFullSet=*/false);
break; break;
case ICmpInst::ICMP_UGT: case ICmpInst::ICMP_UGT:
Lower++; Upper = APInt::getMinValue(BitWidth); // Min = Next(Max) ++Lower; Upper = APInt::getMinValue(BitWidth); // Min = Next(Max)
// Check for an empty-set condition. // Check for an empty-set condition.
if (Lower == Upper) if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false); return ConstantRange(BitWidth, /*isFullSet=*/false);
break; break;
case ICmpInst::ICMP_SGT: case ICmpInst::ICMP_SGT:
Lower++; Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max) ++Lower; Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max)
// Check for an empty-set condition. // Check for an empty-set condition.
if (Lower == Upper) if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false); return ConstantRange(BitWidth, /*isFullSet=*/false);
break; break;
case ICmpInst::ICMP_ULE: case ICmpInst::ICMP_ULE:
Lower = APInt::getMinValue(BitWidth); Upper++; Lower = APInt::getMinValue(BitWidth); ++Upper;
// Check for a full-set condition. // Check for a full-set condition.
if (Lower == Upper) if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true); return ConstantRange(BitWidth, /*isFullSet=*/true);
break; break;
case ICmpInst::ICMP_SLE: case ICmpInst::ICMP_SLE:
Lower = APInt::getSignedMinValue(BitWidth); Upper++; Lower = APInt::getSignedMinValue(BitWidth); ++Upper;
// Check for a full-set condition. // Check for a full-set condition.
if (Lower == Upper) if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true); return ConstantRange(BitWidth, /*isFullSet=*/true);

8
lib/Support/APInt.cpp
View File

@ -559,12 +559,12 @@ bool APInt::slt(const APInt& RHS) const {
if (lhsNeg) { if (lhsNeg) {
// Sign bit is set so perform two's complement to make it positive // Sign bit is set so perform two's complement to make it positive
lhs.flipAllBits(); lhs.flipAllBits();
lhs++; ++lhs;
} }
if (rhsNeg) { if (rhsNeg) {
// Sign bit is set so perform two's complement to make it positive // Sign bit is set so perform two's complement to make it positive
rhs.flipAllBits(); rhs.flipAllBits();
rhs++; ++rhs;
} }
// Now we have unsigned values to compare so do the comparison if necessary // Now we have unsigned values to compare so do the comparison if necessary
@ -2116,7 +2116,7 @@ void APInt::fromString(unsigned numbits, StringRef str, uint8_t radix) {
} }
// If its negative, put it in two's complement form // If its negative, put it in two's complement form
if (isNeg) { if (isNeg) {
(*this)--; --(*this);
this->flipAllBits(); this->flipAllBits();
} }
} }
@ -2197,7 +2197,7 @@ void APInt::toString(SmallVectorImpl<char> &Str, unsigned Radix,
// Flip the bits and add one to turn it into the equivalent positive // Flip the bits and add one to turn it into the equivalent positive
// value and put a '-' in the result. // value and put a '-' in the result.
Tmp.flipAllBits(); Tmp.flipAllBits();
Tmp++; ++Tmp;
Str.push_back('-'); Str.push_back('-');
} }