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Simplify and rearrange long shift code

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17861 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-15 23:16:34 +00:00
parent ced6222bc5
commit 36c625d3a5
1 changed files with 17 additions and 12 deletions
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29
lib/Target/X86/X86ISelSimple.cpp
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@ -2979,23 +2979,28 @@ void X86ISel::emitShiftOperation(MachineBasicBlock *MBB,
DestReg).addReg(SrcReg ).addReg(SrcReg+1).addImm(Amount);
BuildMI(*MBB, IP, Opc[2],2,DestReg+1).addReg(SrcReg+1).addImm(Amount);
}
} else if (Amount == 32) {
if (isLeftShift) {
BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg+1).addReg(SrcReg);
BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg).addImm(0);
} else {
BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg).addReg(SrcReg);
if (!isSigned) {
BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg+1).addImm(0);
} else {
BuildMI(*MBB, IP, X86::SAR32ri, 2,
DestReg+1).addReg(SrcReg).addImm(31);
}
}
} else { // Shifting more than 32 bits
Amount -= 32;
if (isLeftShift) {
if (Amount != 0) {
BuildMI(*MBB, IP, X86::SHL32ri, 2,
DestReg + 1).addReg(SrcReg).addImm(Amount);
} else {
BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg+1).addReg(SrcReg);
}
BuildMI(*MBB, IP, X86::SHL32ri, 2,
DestReg + 1).addReg(SrcReg).addImm(Amount);
BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg).addImm(0);
} else {
if (Amount != 0) {
BuildMI(*MBB, IP, isSigned ? X86::SAR32ri : X86::SHR32ri, 2,
DestReg).addReg(SrcReg+1).addImm(Amount);
} else {
BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg).addReg(SrcReg+1);
}
BuildMI(*MBB, IP, isSigned ? X86::SAR32ri : X86::SHR32ri, 2,
DestReg).addReg(SrcReg+1).addImm(Amount);
BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg+1).addImm(0);
}
}