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Do the string comparison in the constructor instead of once per nop.

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Thanks to Roman Divacky for the suggestion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-11-25 20:50:03 +00:00
parent 854e601471
commit 02ddf4abc2
1 changed files with 9 additions and 6 deletions
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15
lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
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@ -68,9 +68,16 @@ public:
class X86AsmBackend : public MCAsmBackend {
StringRef CPU;
bool HasNopl;
public:
X86AsmBackend(const Target &T, StringRef _CPU)
: MCAsmBackend(), CPU(_CPU) {}
: MCAsmBackend(), CPU(_CPU) {
HasNopl = CPU != "generic" && CPU != "i386" && CPU != "i486" &&
CPU != "i586" && CPU != "pentium" && CPU != "pentium-mmx" &&
CPU != "i686" && CPU != "k6" && CPU != "k6-2" && CPU != "k6-3" &&
CPU != "geode" && CPU != "winchip-c6" && CPU != "winchip2" &&
CPU != "c3" && CPU != "c3-2";
}
unsigned getNumFixupKinds() const {
return X86::NumTargetFixupKinds;
@ -310,11 +317,7 @@ bool X86AsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
// This CPU doesnt support long nops. If needed add more.
// FIXME: Can we get this from the subtarget somehow?
// FIXME: We could generated something better than plain 0x90.
if (CPU == "generic" || CPU == "i386" || CPU == "i486" || CPU == "i586" ||
CPU == "pentium" || CPU == "pentium-mmx" || CPU == "i686" ||
CPU == "k6" || CPU == "k6-2" || CPU == "k6-3" || CPU == "geode" ||
CPU == "winchip-c6" || CPU == "winchip2" || CPU == "c3" ||
CPU == "c3-2") {
if (!HasNopl) {
for (uint64_t i = 0; i < Count; ++i)
OW->Write8(0x90);
return true;