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No-op MSR instructions.

This commit is contained in:
Ben Vanik 2013-12-08 14:31:19 -08:00
parent 760d82a9af
commit 7adc122620
2 changed files with 21 additions and 5 deletions
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5
src/alloy/frontend/ppc/ppc_emit_alu.cc
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@ -692,11 +692,6 @@ XEEMITTER(cntlzwx, 0x7C000034, X )(PPCFunctionBuilder& f, InstrData& i) {
XEEMITTER(eqvx, 0x7C000238, X )(PPCFunctionBuilder& f, InstrData& i) { XEEMITTER(eqvx, 0x7C000238, X )(PPCFunctionBuilder& f, InstrData& i) {
// RA <- (RS) == (RB) // RA <- (RS) == (RB)
// UNTESTED: ensure this is correct.
XEASSERTALWAYS();
f.DebugBreak();
Value* ra = f.Xor(f.LoadGPR(i.X.RT), f.LoadGPR(i.X.RB)); Value* ra = f.Xor(f.LoadGPR(i.X.RT), f.LoadGPR(i.X.RB));
ra = f.Not(ra); ra = f.Not(ra);
if (i.X.Rc) { if (i.X.Rc) {

21
src/alloy/frontend/ppc/ppc_emit_control.cc
View File

@ -546,6 +546,24 @@ XEEMITTER(mtspr, 0x7C0003A6, XFX)(PPCFunctionBuilder& f, InstrData& i) {
return 0; return 0;
} }
// TODO(benvanik): MSR is used for toggling interrupts, and it'd be nice to
// obey that setting. It's usually guarding atomic stores.
XEEMITTER(mfmsr, 0x7C0000A6, X )(PPCFunctionBuilder& f, InstrData& i) {
f.Nop();
return 0;
}
XEEMITTER(mtmsr, 0x7C000124, X )(PPCFunctionBuilder& f, InstrData& i) {
f.Nop();
return 0;
}
XEEMITTER(mtmsrd, 0x7C000164, X )(PPCFunctionBuilder& f, InstrData& i) {
f.Nop();
return 0;
}
void RegisterEmitCategoryControl() { void RegisterEmitCategoryControl() {
XEREGISTERINSTR(bx, 0x48000000); XEREGISTERINSTR(bx, 0x48000000);
@ -571,6 +589,9 @@ void RegisterEmitCategoryControl() {
XEREGISTERINSTR(mftb, 0x7C0002E6); XEREGISTERINSTR(mftb, 0x7C0002E6);
XEREGISTERINSTR(mtcrf, 0x7C000120); XEREGISTERINSTR(mtcrf, 0x7C000120);
XEREGISTERINSTR(mtspr, 0x7C0003A6); XEREGISTERINSTR(mtspr, 0x7C0003A6);
XEREGISTERINSTR(mfmsr, 0x7C0000A6);
XEREGISTERINSTR(mtmsr, 0x7C000124);
XEREGISTERINSTR(mtmsrd, 0x7C000164);
} }