[llvm] 4ea5475 - [KnownBits] Add KnownBits::haveNoCommonBitsSet helper. NFCI.
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 2 13:44:48 PDT 2021
Author: Simon Pilgrim
Date: 2021-04-02T21:44:33+01:00
New Revision: 4ea5475a3f3b13c5abaa6d0754bbc3ba72847377
URL: https://github.com/llvm/llvm-project/commit/4ea5475a3f3b13c5abaa6d0754bbc3ba72847377
DIFF: https://github.com/llvm/llvm-project/commit/4ea5475a3f3b13c5abaa6d0754bbc3ba72847377.diff
LOG: [KnownBits] Add KnownBits::haveNoCommonBitsSet helper. NFCI.
Include exhaustive test coverage.
Added:
Modified:
llvm/include/llvm/Support/KnownBits.h
llvm/lib/Analysis/ValueTracking.cpp
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
llvm/unittests/Support/KnownBitsTest.cpp
Removed:
################################################################################
diff --git a/llvm/include/llvm/Support/KnownBits.h b/llvm/include/llvm/Support/KnownBits.h
index 2e720bdde59e..2937fced601f 100644
--- a/llvm/include/llvm/Support/KnownBits.h
+++ b/llvm/include/llvm/Support/KnownBits.h
@@ -285,6 +285,11 @@ struct KnownBits {
return KnownBits(LHS.Zero & RHS.Zero, LHS.One & RHS.One);
}
+ /// Return true if LHS and RHS have no common bits set.
+ static bool haveNoCommonBitsSet(const KnownBits &LHS, const KnownBits &RHS) {
+ return (LHS.Zero | RHS.Zero).isAllOnesValue();
+ }
+
/// Compute known bits resulting from adding LHS, RHS and a 1-bit Carry.
static KnownBits computeForAddCarry(
const KnownBits &LHS, const KnownBits &RHS, const KnownBits &Carry);
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index cffbe927adb3..0559c68a87c7 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -301,7 +301,7 @@ bool llvm::haveNoCommonBitsSet(const Value *LHS, const Value *RHS,
KnownBits RHSKnown(IT->getBitWidth());
computeKnownBits(LHS, LHSKnown, DL, 0, AC, CxtI, DT, nullptr, UseInstrInfo);
computeKnownBits(RHS, RHSKnown, DL, 0, AC, CxtI, DT, nullptr, UseInstrInfo);
- return (LHSKnown.Zero | RHSKnown.Zero).isAllOnesValue();
+ return KnownBits::haveNoCommonBitsSet(LHSKnown, RHSKnown);
}
bool llvm::isOnlyUsedInZeroEqualityComparison(const Instruction *CxtI) {
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 064f8cb8597e..1e46a4066b68 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4351,7 +4351,8 @@ bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const {
bool SelectionDAG::haveNoCommonBitsSet(SDValue A, SDValue B) const {
assert(A.getValueType() == B.getValueType() &&
"Values must have the same type");
- return (computeKnownBits(A).Zero | computeKnownBits(B).Zero).isAllOnesValue();
+ return KnownBits::haveNoCommonBitsSet(computeKnownBits(A),
+ computeKnownBits(B));
}
static SDValue FoldSTEP_VECTOR(const SDLoc &DL, EVT VT, SDValue Step,
diff --git a/llvm/unittests/Support/KnownBitsTest.cpp b/llvm/unittests/Support/KnownBitsTest.cpp
index 5f2133165d24..784bc6db70c0 100644
--- a/llvm/unittests/Support/KnownBitsTest.cpp
+++ b/llvm/unittests/Support/KnownBitsTest.cpp
@@ -463,4 +463,20 @@ TEST(KnownBitsTest, SExtInReg) {
}
}
+TEST(KnownBitsTest, CommonBitsSet) {
+ unsigned Bits = 4;
+ ForeachKnownBits(Bits, [&](const KnownBits &Known1) {
+ ForeachKnownBits(Bits, [&](const KnownBits &Known2) {
+ bool HasCommonBitsSet = false;
+ ForeachNumInKnownBits(Known1, [&](const APInt &N1) {
+ ForeachNumInKnownBits(Known2, [&](const APInt &N2) {
+ HasCommonBitsSet |= N1.intersects(N2);
+ });
+ });
+ EXPECT_EQ(!HasCommonBitsSet,
+ KnownBits::haveNoCommonBitsSet(Known1, Known2));
+ });
+ });
+}
+
} // end anonymous namespace
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