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Special register check for lwbrx. Need a scalable way to do this.

This commit is contained in:
Ben Vanik 2013-10-23 21:10:26 -07:00
parent b7ffd46319
commit 6e60aef72f
1 changed files with 16 additions and 2 deletions
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18
src/xenia/cpu/x64/x64_emit_memory.cc
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@ -450,7 +450,7 @@ XEEMITTER(lwz, 0x80000000, D )(X64Emitter& e, X86Compiler& c, InstrDat
// EA <- b + EXTS(D)
// RT <- i32.0 || MEM(EA, 4)
// Special GPU access (0x7FC8xxxx).
// Special register access check.
uint64_t constant_ea;
if (i.D.RA && e.get_constant_gpr_value(i.D.RA, &constant_ea)) {
constant_ea += XEEXTS16(i.D.DS);
@ -820,7 +820,7 @@ XEEMITTER(stw, 0x90000000, D )(X64Emitter& e, X86Compiler& c, InstrDat
// EA <- b + EXTS(D)
// MEM(EA, 4) <- (RS)[32:63]
// Special GPU access (0x7FC8xxxx).
// Special register access check.
uint64_t constant_ea;
if (i.D.RA && e.get_constant_gpr_value(i.D.RA, &constant_ea)) {
constant_ea += XEEXTS16(i.D.DS);
@ -939,6 +939,20 @@ XEEMITTER(lwbrx, 0x7C00042C, X )(X64Emitter& e, X86Compiler& c, InstrDat
// EA <- b + (RB)
// RT <- i32.0 || bswap(MEM(EA, 4))
// Special register access check.
uint64_t constant_ra = 0, constant_rb = 0;
if ((!i.X.RA || e.get_constant_gpr_value(i.X.RA, &constant_ra)) &&
e.get_constant_gpr_value(i.X.RB, &constant_rb)) {
uint64_t constant_ea = constant_ra + constant_rb;
GpVar reg;
if (e.check_constant_gpr_read((uint32_t)constant_ea, &reg)) {
c.bswap(reg);
e.update_gpr_value(i.X.RT, reg);
e.clear_constant_gpr_value(i.D.RT);
return 0;
}
}
GpVar ea(c.newGpVar());
c.mov(ea, e.gpr_value(i.X.RB));
if (i.X.RA) {