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Revert r314248 "[X86] Don't emit X86::MOV8rr_NOREX from X86InstrInfo::copyPhysReg."

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This contributed to PR34751

llvm-svn: 314338
This commit is contained in:
Craig Topper 2017-09-27 20:34:13 +00:00
parent 0686462fbf
commit 197e169282
1 changed files with 7 additions and 5 deletions
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12
lib/Target/X86/X86InstrInfo.cpp
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@ -6600,14 +6600,16 @@ void X86InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
else if (X86::GR16RegClass.contains(DestReg, SrcReg))
Opc = X86::MOV16rr;
else if (X86::GR8RegClass.contains(DestReg, SrcReg)) {
// Copying to or from a physical H register on x86-64 must ensure it
// doesn't require a REX prefix for the other register.
if ((isHReg(DestReg) || isHReg(SrcReg)) && Subtarget.is64Bit()) {
// Copying to or from a physical H register on x86-64 requires a NOREX
// move. Otherwise use a normal move.
if ((isHReg(DestReg) || isHReg(SrcReg)) &&
Subtarget.is64Bit()) {
Opc = X86::MOV8rr_NOREX;
// Both operands must be encodable without an REX prefix.
assert(X86::GR8_NOREXRegClass.contains(SrcReg, DestReg) &&
"8-bit H register can not be copied outside GR8_NOREX");
}
Opc = X86::MOV8rr;
} else
Opc = X86::MOV8rr;
}
else if (X86::VR64RegClass.contains(DestReg, SrcReg))
Opc = X86::MMX_MOVQ64rr;