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add uadd_ov/usub_ov to apint, consolidate constant folding

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logic to use the new APInt methods.  Among other things this
implements rdar://8501501 - llvm.smul.with.overflow.i32 should constant fold

which comes from "clang -ftrapv", originally brought to my attention from PR8221.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116457 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-10-14 00:05:07 +00:00
parent 08e90f5646
commit eafc5cb80d
4 changed files with 54 additions and 35 deletions
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12
lib/Support/APInt.cpp
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@ -2053,6 +2053,12 @@ APInt APInt::sadd_ov(const APInt &RHS, bool &Overflow) const {
return Res;
}
APInt APInt::uadd_ov(const APInt &RHS, bool &Overflow) const {
APInt Res = *this+RHS;
Overflow = Res.ult(RHS);
return Res;
}
APInt APInt::ssub_ov(const APInt &RHS, bool &Overflow) const {
APInt Res = *this - RHS;
Overflow = isNonNegative() != RHS.isNonNegative() &&
@ -2060,6 +2066,12 @@ APInt APInt::ssub_ov(const APInt &RHS, bool &Overflow) const {
return Res;
}
APInt APInt::usub_ov(const APInt &RHS, bool &Overflow) const {
APInt Res = *this+RHS;
Overflow = Res.ugt(RHS);
return Res;
}
APInt APInt::sdiv_ov(const APInt &RHS, bool &Overflow) const {
// MININT/-1 --> overflow.
Overflow = isMinSignedValue() && RHS.isAllOnesValue();