[SelectionDAG] Use KnownBits struct in DAG's computeKnownBits and simplifyDemandedBits
This patch replaces the separate APInts for KnownZero/KnownOne with a single KnownBits struct. This is similar to what was done to ValueTracking's version recently.
This is largely a mechanical transformation from KnownZero to Known.Zero.
Differential Revision: https://reviews.llvm.org/D32569
llvm-svn: 301620
diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.cpp b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
index f120a98..c44e371 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -30,6 +30,7 @@
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/KnownBits.h"
using namespace llvm;
@@ -1875,25 +1876,24 @@
/// combiner.
void SparcTargetLowering::computeKnownBitsForTargetNode
(const SDValue Op,
- APInt &KnownZero,
- APInt &KnownOne,
+ KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth) const {
- APInt KnownZero2, KnownOne2;
- KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0);
+ KnownBits Known2;
+ Known.Zero.clearAllBits(); Known.One.clearAllBits();
switch (Op.getOpcode()) {
default: break;
case SPISD::SELECT_ICC:
case SPISD::SELECT_XCC:
case SPISD::SELECT_FCC:
- DAG.computeKnownBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
- DAG.computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
+ DAG.computeKnownBits(Op.getOperand(1), Known, Depth+1);
+ DAG.computeKnownBits(Op.getOperand(0), Known2, Depth+1);
// Only known if known in both the LHS and RHS.
- KnownOne &= KnownOne2;
- KnownZero &= KnownZero2;
+ Known.One &= Known2.One;
+ Known.Zero &= Known2.Zero;
break;
}
}
diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.h b/llvm/lib/Target/Sparc/SparcISelLowering.h
index 90d0398..cc6386b 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.h
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.h
@@ -66,8 +66,7 @@
/// in Mask are known to be either zero or one and return them in the
/// KnownZero/KnownOne bitsets.
void computeKnownBitsForTargetNode(const SDValue Op,
- APInt &KnownZero,
- APInt &KnownOne,
+ KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth = 0) const override;