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X86: when replacing SUB with TEST in ISelDAGToDAG, only replace uses of the

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second output of SUB with first output of TEST.

PR13966

llvm-svn: 164835
This commit is contained in:
Manman Ren 2012-09-28 18:53:24 +00:00
parent 6b7788b0c5
commit d68cc7772f
1 changed files with 28 additions and 5 deletions
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33
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -2525,7 +2525,13 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
MVT::i8, Reg);
// Emit a testb.
return CurDAG->getMachineNode(X86::TEST8ri, dl, MVT::i32, Subreg, Imm);
SDNode *NewNode = CurDAG->getMachineNode(X86::TEST8ri, dl, MVT::i32,
Subreg, Imm);
// Replace SUB|CMP with TEST, since SUB has two outputs while TEST has
// one, do not call ReplaceAllUsesWith.
ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
SDValue(NewNode, 0));
return NULL;
}
// For example, "testl %eax, $2048" to "testb %ah, $8".
@ -2556,8 +2562,13 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
// Emit a testb. The EXTRACT_SUBREG becomes a COPY that can only
// target GR8_NOREX registers, so make sure the register class is
// forced.
return CurDAG->getMachineNode(X86::TEST8ri_NOREX, dl, MVT::i32,
Subreg, ShiftedImm);
SDNode *NewNode = CurDAG->getMachineNode(X86::TEST8ri_NOREX, dl,
MVT::i32, Subreg, ShiftedImm);
// Replace SUB|CMP with TEST, since SUB has two outputs while TEST has
// one, do not call ReplaceAllUsesWith.
ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
SDValue(NewNode, 0));
return NULL;
}
// For example, "testl %eax, $32776" to "testw %ax, $32776".
@ -2573,7 +2584,13 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
MVT::i16, Reg);
// Emit a testw.
return CurDAG->getMachineNode(X86::TEST16ri, dl, MVT::i32, Subreg, Imm);
SDNode *NewNode = CurDAG->getMachineNode(X86::TEST16ri, dl, MVT::i32,
Subreg, Imm);
// Replace SUB|CMP with TEST, since SUB has two outputs while TEST has
// one, do not call ReplaceAllUsesWith.
ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
SDValue(NewNode, 0));
return NULL;
}
// For example, "testq %rax, $268468232" to "testl %eax, $268468232".
@ -2589,7 +2606,13 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
MVT::i32, Reg);
// Emit a testl.
return CurDAG->getMachineNode(X86::TEST32ri, dl, MVT::i32, Subreg, Imm);
SDNode *NewNode = CurDAG->getMachineNode(X86::TEST32ri, dl, MVT::i32,
Subreg, Imm);
// Replace SUB|CMP with TEST, since SUB has two outputs while TEST has
// one, do not call ReplaceAllUsesWith.
ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
SDValue(NewNode, 0));
return NULL;
}
}
break;