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[X86] Keep looping over operands looking for byte registers even if we already found a register that requires a REX prefix. Otherwise we don't error if a high byte register is used after SPL/BPL/DIL/SIL. 

llvm-svn: 279923
This commit is contained in:
Craig Topper 2016-08-27 17:13:41 +00:00
parent 6acca80e17
commit 45793a1f7a
1 changed files with 4 additions and 5 deletions
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3
llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
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@ -1017,11 +1017,10 @@ uint8_t X86MCCodeEmitter::DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
unsigned Reg = MO.getReg(); unsigned Reg = MO.getReg();
if (Reg == X86::AH || Reg == X86::BH || Reg == X86::CH || Reg == X86::DH) if (Reg == X86::AH || Reg == X86::BH || Reg == X86::CH || Reg == X86::DH)
UsesHighByteReg = true; UsesHighByteReg = true;
if (!X86II::isX86_64NonExtLowByteReg(Reg)) continue; if (X86II::isX86_64NonExtLowByteReg(Reg))
// FIXME: The caller of DetermineREXPrefix slaps this prefix onto anything // FIXME: The caller of DetermineREXPrefix slaps this prefix onto anything
// that returns non-zero. // that returns non-zero.
REX |= 0x40; // REX fixed encoding prefix REX |= 0x40; // REX fixed encoding prefix
break;
} }
switch (TSFlags & X86II::FormMask) { switch (TSFlags & X86II::FormMask) {