[X86] Use isUInt and isShiftedUInt instead of using our own masking and compares. NFCI

While there use a local variable instead of calling C->getZExtValue() repeatedly.

llvm-svn: 311764

1 files changed, 13 insertions, 21 deletions

diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 1610d690321..ab1eca01d8a 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2645,12 +2645,12 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
         X86::isZeroNode(N1)) {
       ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
       if (!C) break;
+      uint64_t Mask = C->getZExtValue();
 
       // For example, convert "testl %eax, $8" to "testb %al, $8"
-      if ((C->getZExtValue() & ~UINT64_C(0xff)) == 0 &&
-          (!(C->getZExtValue() & 0x80) ||
-           hasNoSignedComparisonUses(Node))) {
-        SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), dl, MVT::i8);
+      if (isUInt<8>(Mask) &&
+          (!(Mask & 0x80) || hasNoSignedComparisonUses(Node))) {
+        SDValue Imm = CurDAG->getTargetConstant(Mask, dl, MVT::i8);
         SDValue Reg = N0.getOperand(0);
 
         // On x86-32, only the ABCD registers have 8-bit subregisters.
@@ -2681,12 +2681,10 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
       }
 
       // For example, "testl %eax, $2048" to "testb %ah, $8".
-      if ((C->getZExtValue() & ~UINT64_C(0xff00)) == 0 &&
-          (!(C->getZExtValue() & 0x8000) ||
-           hasNoSignedComparisonUses(Node))) {
+      if (isShiftedUInt<8, 8>(Mask) &&
+          (!(Mask & 0x8000) || hasNoSignedComparisonUses(Node))) {
         // Shift the immediate right by 8 bits.
-        SDValue ShiftedImm = CurDAG->getTargetConstant(C->getZExtValue() >> 8,
-                                                       dl, MVT::i8);
+        SDValue ShiftedImm = CurDAG->getTargetConstant(Mask >> 8, dl, MVT::i8);
         SDValue Reg = N0.getOperand(0);
 
         // Put the value in an ABCD register.
@@ -2718,12 +2716,9 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
       }
 
       // For example, "testl %eax, $32776" to "testw %ax, $32776".
-      if ((C->getZExtValue() & ~UINT64_C(0xffff)) == 0 &&
-          N0.getValueType() != MVT::i16 &&
-          (!(C->getZExtValue() & 0x8000) ||
-           hasNoSignedComparisonUses(Node))) {
-        SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), dl,
-                                                MVT::i16);
+      if (isUInt<16>(Mask) && N0.getValueType() != MVT::i16 &&
+          (!(Mask & 0x8000) || hasNoSignedComparisonUses(Node))) {
+        SDValue Imm = CurDAG->getTargetConstant(Mask, dl, MVT::i16);
         SDValue Reg = N0.getOperand(0);
 
         // Extract the 16-bit subregister.
@@ -2741,12 +2736,9 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
       }
 
       // For example, "testq %rax, $268468232" to "testl %eax, $268468232".
-      if ((C->getZExtValue() & ~UINT64_C(0xffffffff)) == 0 &&
-          N0.getValueType() == MVT::i64 &&
-          (!(C->getZExtValue() & 0x80000000) ||
-           hasNoSignedComparisonUses(Node))) {
-        SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), dl,
-                                                MVT::i32);
+      if (isUInt<32>(Mask) && N0.getValueType() == MVT::i64 &&
+          (!(Mask & 0x80000000) || hasNoSignedComparisonUses(Node))) {
+        SDValue Imm = CurDAG->getTargetConstant(Mask, dl, MVT::i32);
         SDValue Reg = N0.getOperand(0);
 
         // Extract the 32-bit subregister.