[llvm] r301193 - [DAGCombiner] Updated bswap byte offset variable names to be more descriptive. NFC
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 24 10:05:14 PDT 2017
Author: rksimon
Date: Mon Apr 24 12:05:14 2017
New Revision: 301193
URL: http://llvm.org/viewvc/llvm-project?rev=301193&view=rev
Log:
[DAGCombiner] Updated bswap byte offset variable names to be more descriptive. NFC
As discussed on D32039, use MaskByteOffset to describe the variable and also pull out repeated getOpcode() calls.
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=301193&r1=301192&r2=301193&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Mon Apr 24 12:05:14 2017
@@ -3878,27 +3878,29 @@ static bool isBSwapHWordElement(SDValue
if (Opc != ISD::AND && Opc != ISD::SHL && Opc != ISD::SRL)
return false;
+ SDValue N0 = N.getOperand(0);
+ unsigned Opc0 = N0.getOpcode();
+
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!N1C)
return false;
- unsigned Num;
+ unsigned MaskByteOffset;
switch (N1C->getZExtValue()) {
default:
return false;
- case 0xFF: Num = 0; break;
- case 0xFF00: Num = 1; break;
- case 0xFF0000: Num = 2; break;
- case 0xFF000000: Num = 3; break;
+ case 0xFF: MaskByteOffset = 0; break;
+ case 0xFF00: MaskByteOffset = 1; break;
+ case 0xFF0000: MaskByteOffset = 2; break;
+ case 0xFF000000: MaskByteOffset = 3; break;
}
// Look for (x & 0xff) << 8 as well as ((x << 8) & 0xff00).
- SDValue N0 = N.getOperand(0);
if (Opc == ISD::AND) {
- if (Num == 0 || Num == 2) {
+ if (MaskByteOffset == 0 || MaskByteOffset == 2) {
// (x >> 8) & 0xff
// (x >> 8) & 0xff0000
- if (N0.getOpcode() != ISD::SRL)
+ if (Opc0 != ISD::SRL)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (!C || C->getZExtValue() != 8)
@@ -3906,7 +3908,7 @@ static bool isBSwapHWordElement(SDValue
} else {
// (x << 8) & 0xff00
// (x << 8) & 0xff000000
- if (N0.getOpcode() != ISD::SHL)
+ if (Opc0 != ISD::SHL)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (!C || C->getZExtValue() != 8)
@@ -3915,7 +3917,7 @@ static bool isBSwapHWordElement(SDValue
} else if (Opc == ISD::SHL) {
// (x & 0xff) << 8
// (x & 0xff0000) << 8
- if (Num != 0 && Num != 2)
+ if (MaskByteOffset != 0 && MaskByteOffset != 2)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!C || C->getZExtValue() != 8)
@@ -3923,17 +3925,17 @@ static bool isBSwapHWordElement(SDValue
} else { // Opc == ISD::SRL
// (x & 0xff00) >> 8
// (x & 0xff000000) >> 8
- if (Num != 1 && Num != 3)
+ if (MaskByteOffset != 1 && MaskByteOffset != 3)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!C || C->getZExtValue() != 8)
return false;
}
- if (Parts[Num])
+ if (Parts[MaskByteOffset])
return false;
- Parts[Num] = N0.getOperand(0).getNode();
+ Parts[MaskByteOffset] = N0.getOperand(0).getNode();
return true;
}
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