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[X86] Remove dead code for handling i8/i16 UMUL_LOHI/SMUL_LOHI from X86ISelDAGToDAG.cpp. NFC 

These are promoted to i16/i32 multiplies by a DAG combine.

llvm-svn: 329147
This commit is contained in:
Craig Topper 2018-04-04 04:38:55 +00:00
parent 3064c15dc3
commit afa22edcf0
1 changed files with 0 additions and 12 deletions
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12
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -2816,8 +2816,6 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
if (!isSigned) {
switch (NVT.SimpleTy) {
default: llvm_unreachable("Unsupported VT!");
case MVT::i8: Opc = X86::MUL8r; MOpc = X86::MUL8m; break;
case MVT::i16: Opc = X86::MUL16r; MOpc = X86::MUL16m; break;
case MVT::i32: Opc = hasBMI2 ? X86::MULX32rr : X86::MUL32r;
MOpc = hasBMI2 ? X86::MULX32rm : X86::MUL32m; break;
case MVT::i64: Opc = hasBMI2 ? X86::MULX64rr : X86::MUL64r;
@ -2826,8 +2824,6 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
} else {
switch (NVT.SimpleTy) {
default: llvm_unreachable("Unsupported VT!");
case MVT::i8: Opc = X86::IMUL8r; MOpc = X86::IMUL8m; break;
case MVT::i16: Opc = X86::IMUL16r; MOpc = X86::IMUL16m; break;
case MVT::i32: Opc = X86::IMUL32r; MOpc = X86::IMUL32m; break;
case MVT::i64: Opc = X86::IMUL64r; MOpc = X86::IMUL64m; break;
}
@ -2836,14 +2832,6 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
unsigned SrcReg, LoReg, HiReg;
switch (Opc) {
default: llvm_unreachable("Unknown MUL opcode!");
case X86::IMUL8r:
case X86::MUL8r:
SrcReg = LoReg = X86::AL; HiReg = X86::AH;
break;
case X86::IMUL16r:
case X86::MUL16r:
SrcReg = LoReg = X86::AX; HiReg = X86::DX;
break;
case X86::IMUL32r:
case X86::MUL32r:
SrcReg = LoReg = X86::EAX; HiReg = X86::EDX;